# FINAL 2007 AQMP

APPENDIX II

CURRENT AIR QUALITY

JUNE 2007

# SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT

GOVERNING BOARD

Chairman: WILLIAM A. BURKE, Ed.D. Speaker of the Assembly Appointee

Vice Chairman: S. ROY WILSON, Ed.D. Supervisor, Fourth District Riverside County Representative

MEMBERS:

MICHAEL D. ANTONOVICH Supervisor, Fifth District Los Angeles County Representative

BILL CAMPBELL Supervisor, Third District Orange County Representative

JANE W. CARNEY Senate Rules Committee Appointee

RONALD O. LOVERIDGE Mayor, City of Riverside Cities Representative, Riverside County

GARY OVITT Supervisor, Fourth District San Bernardino County Representative

JAN PERRY Councilmember, City of Los Angeles Cities Representative, Los Angeles County, Western Region

MIGUEL A. PULIDO Mayor, City of Santa Ana Cities Representative, Orange County

TONIA REYES URANGA Councilmember, City of Long Beach Cities Representative, Los Angeles County, Eastern Region

VACANT Governor’s Appointee

DENNIS YATES Mayor, City of Chino Cities Representative, San Bernardino County

EXECUTIVE OFFICER
BARRY R. WALLERSTEIN, D.Env

.

# CONTRIBUTORS

South Coast Air Quality Management District

Barry R. Wallerstein, D.Env.

Executive Officer

Elaine Chang, DrPH Deputy Executive Officer Planning, Rule Development, & Area Sources

Laki Tisopulos, Ph.D., P.E. Assistant Deputy Executive Officer Planning, Rule Development, & Area Sources

Jill Whynot Planning and Rules Manager Planning, Rule Development, & Area Sources

Authors

SCAQMD - Planning, Rule Development, & Area Sources

Tom Chico, Program Supervisor

Shoreh Cohanim, Air Quality Specilaist

Contributors

SCAQMD – Science & Technology Advancement U. S. Environmental Protction Agency 

# :

Leonard Edwards, Air Quality Data Translator Coe Owen
Sandra Hom, Sr. Air Quality Chemist

Hanna Zhuang, Air Quality Data Translator

Reviewed By

Barbara Baird, J.D. - Principal Deputy District Counsel

Production

Patti Whiting, Staff Specilaist Ann Scagliola, Secretary

# i 

# Table of Contents

SUMMARY

Summary .................................................................................................................II-S-1

South Coast Air Basin..................................................................................II-S-1 Riverside County Salton Sea Air Basin.......................................................II-S-2 Seasonal, Day-of-Week, and Diurnal Variations ........................................II-S-2



# CHAPTER 1 INTRODUCTION

Air Quality Overview .............................................................................................II-1-1 Air Quality Standards a nd Episode Le vels.............................................................II-1-2 South Coast Air Quality Ma nagement District.......................................................II-1-3 South Coast, Salton Sea, and Mo jave Desert Air Basins .......................................II-1-4

Weather ...................................................................................................................II-1- 4

Emissions. ...............................................................................................................II-1-5 Air Quality Tr ends ..................................................................................................II-1-6 Air Quality in the District Compared to Other Areas of the U.S. ..........................II-1-7



# CHAPTER 2 AIR QUALITY IN THE SOUTH COAST AIR BASIN

Air Quality in the South Coast Air Basin ...............................................................II-2-1 Ozone (O 3 

# ) ..............................................................................................................II-2-1 Suspended Particul ate Matter .................................................................................II-2-9 Particulate Matter (PM 10 

# )........................................................................................II-2-9 Fine Particulate Matter (PM 2.5 

# ).............................................................................II-2-14

Carbon Monoxide (CO) ........................................................................................II-2-17 Nitrogen Dioxide (NO 2 

# )........................................................................................II-2-19 Sulfur Dioxide (SO 2 

# ).............................................................................................II-2-20 Sulfate (SO 4 = 

# )........................................................................................................II-2-22 Lead (Pb) ...............................................................................................................II-2-23



# CHAPTER 3 AIR QUALITY IN THE RIVERSIDE COUNTY SSAB

Air Quality in the Rive rside County SSAB............................................................II-3-1 Ozone (O 3 

# ) ..............................................................................................................II-3-2 Particulate Matter (PM 10 

# )........................................................................................II-3-3 Fine Particulate Matter (PM 2.5 

# )...............................................................................II-3-4

Carbon Monoxide (CO) ..........................................................................................II-3-4 Nitrogen Dioxide (NO 2 

# )..........................................................................................II-3-4 Sulfur Dioxide (SO 2 

# )...............................................................................................II-3-5

# Final 2007 AQMP Appendix II: Current Air Quality

ii Sulfate (SO 4 = 

# )..........................................................................................................II-3-5 Lead (P b).................................................................................................................II-3- 5



# LIST OF FIGURES:

Figure 1-1: 2005 Maximum Pollu tant Concentrations As

Percent of Sta ndards ....................................................................................II-1-1

Figure 1-2: South Coast Air Qua lity Management District...................................II-1-3

Figure 1-3: 2002 Average Daily Em issions in the Basin ......................................II-1-5

Figure 1-4: Percent Basin-Days Exceeding the Federal Satandard,

1990-2005 ....................................................................................................II-1-6

Figure 2-1: Number of Days per Month Exceeding State or

Federal Standard s in 2005............................................................................II-2-2

Figure 2-2: Ozone - 2005, Number of Days Exceeding 1-Hour

Federal Standard ..........................................................................................II-2-5

Figure 2-3: Ozone - 2005, Number of Days Exceeding 8-Hour

Federal Standard ..........................................................................................II-2-5

Figure 2-4: Number of Da ys Per Month Exceeding

Federal Ozone Standard in the Basin...........................................................II-2-6

Figure 2-5: Ozone, Diurnal Varia tion, 2005, Maximum 8-Hour Average

Concentration for Each H our in the Basin...................................................II-2-7

Figure 2-6: Ozone, Day-of-Week Variation, 2005, Exceedances

of the Federal Standard by Day of Week.....................................................II-2-8

Figure 2-7: Particulate Matter (PM10) - 2005, Annual Arithmetic Mean, μg/m 3............................................................................II-2-10

Figure 2-8: Basin-Days Exceeding State PM 10 

# Standard by Month, 2003- 2005 .....................................................................................II-2 -12

Figure 2-9: Monthly Average PM 10 Concentration, 2003-2005 ........................ II-2-12

Figure 2-10: Day-of-Week Va riation, 2003-2005, Average PM10 Concentration by Da y of Week .................................................................II-2-13

# iii Figure 2-11: Diurnal Variation, 2005, Average PM10 Concentration

for Each Hour of the Day...........................................................................II-2-13

Figure 2-12: Fine Particulate Matter (PM2.5) - 2005, Annual Arithmetic Mean, μg/m 3............................................................................II-2-15

Figure 2-13: PM2.5 Seasonal Va riation, 2005, Monthly Average Concentration in the Basin, μg/m 3 ............................................................II-2-16

Figure 2-14: PM2.5 Day-of-Week Variation, 2003-2005, Basin-Days Exceeding the Federal Standa rd by Day of Week.....................................II-2-16

Figure 2-15: Diurnal Variation, 2003-2005, Average PM2.5 Concentration

for Each Hour of the Day...........................................................................II-2-17

Figure 3-1: 2005 Maximum Pollutant Concentrations as Percent of Standards, Riversid e County SS AB ............................................................II-3-1

Figure 3-2: Ozone, 1990-2005, Numb er of Days Exceeding Federal

Standards in Riversid e County SS AB .........................................................II-3-3



# LIST OF TABLES:

Table 1: 2005 Maximum 8-Hour Average Carbon Monoxide

Concentrati ons ...........................................................................................II-2-19

Table 2: 2005 Maximum Annual Average Nitrogen Dioxide

Concentrati ons ...........................................................................................II-2-20

Table 3: 2005 Maximum 24-Hour Average Sulfur Dioxide

Concentrati ons ...........................................................................................II-2-21

Table 4: 2005 Maximum 24-Hour Aver age Sulfate Concentrations...................II-2-22

Table 5: 2005 Maximum Quarterly Average Lead Concentrations ....................II-2-23

# Final 2007 AQMP Appendix II: Current Air Quality

iv 

# ATTACHMENT LIST:

Table A-1: Ambient Air Quality Standards

Table A-2: Episode Criteria

Table A-3: Air Monitoring Sta tions and Source/Receptor Areas

Figure A-1: South Coast Air Basin and Adjoining Areas of Salton Sea Air Basin

Table A-4: Ozone - Number of Days Exceeding the Federal Standard (0.08 ppm, 8-Hour Average)

Table A-5: Ozone - Number of Days Exceeding the Federal Standard (0.12 ppm, 1-Hour Average)

Table A-6: Ozone - Number of Days of First/Second Stage Episodes, 1990-2005

Table A-7: Ozone - Annua l Maximum 1-Hour, ppm, 1976-2005

Table A-8: Particulate Matter (PM10), Annual Arithmetic Mean,

μ g/m 3 

# , 1990-2005

Table A-9: Particulate Matter (P M10) - Percent of Sampling Days Exceeding State Standard a nd Federal Standards, 1990-2005

Table A-10: Particulate Matter (PM10), Annual Maximum 24-Hour Average, μ g/ m 3 

# , 1990-2005

Table A-11-: Fine Particle Matter (PM2.5), Annual Arithmetic Mean, μ g/m 3



# , 1999-2005

Table A-12: Fine Particulate Matter (PM2.5) - Percent of Sampling Days Exceeding Federal Standard (65 μ g/m 3 

# ), 1999-2000

Table A-13: Fine Particulate Matter (PM2.5) - Percent of Sampling Days Exceeding the New Federal Standard (35 μ g/m 3 

# ), 1999-2000

Table A-14: Particulate Matter (PM2.5), Annual Maximum 24-Hour Average, μ g/m 3 

# , 1999-2005

Table A-15: Particulate Matter (PM2.5) - 24-Hour Average 98 th 

# Percentile Concentration, μg/ m 3 

# , 1999-2005

Table A-16: Carbon Monoxide - Number of Days Maximum 8-Hour Average Exceeded the Federal Standard, 1990-2005

# v Table A-17: Carbon Monoxide - Number of Days Maximum 8-Hour Average Exceeded the Federal Alert Level, 1990-2005

Table A-18: Carbon Monoxide, Annual Maximum 8-Hour Average, ppm,

1990-2005

Table A-19: Nitrogen Dioxide - Annua l Average of All Hours, pphm, 1990-2005

Table A-20: Nitrogen Dioxide - Number of Days 1-Hour Average Exceeded the State Standard, 1990-2005

Table A-21: Nitrogen Dioxide, Annual Maximum 1-Hour, ppm, 1990-2005

Table A-22: Sulfur Dioxide - Annual Average, pphm, 1990-2005

Table A-23: Sulfur Dioxide, Annual Maximum 1-Hour Average, ppm, 1990-2005

Table A-24: Sulfate - Percent of Samp ling Days Exceeding the State Standard,

1990-2005

Table A-25: Sulfate - Maxi mum 24-Hour Averages, 1990-2005

Table A-26: Lead - Highest Calendar Quarter Mean, μ g/m 3 

# , 1990-2005

Table A-27: Lead - Highest Monthly Averages, μ g/m 3 

# , 1990-2005

# SUMMARY

South Coast Air Basin

Riverside County Salton Sea Air Basin

Seasonal, Day-of-Week, and Diurnal Variations

# Summary

II-S-1 

# SUMMARY

This appendix contains a summary of the year 2005 air quality in the South Coast Air Basin (Basin) and the portion of Salton Sea Air Basin (SSAB) monitored by the AQMD. The Basin includes Orange county and the non-desert por tions of Los Angeles,

Riverside and San Bernardino counties. For those pollutants for which the Basin is in nonattainment of the federal standards (O 3 

# ; PM10; and PM2.5), air quality trends through the year 2005 are presented. Chap ter 1 of this appe ndix presents brief descriptions of the pollutant emissions in the Basin, ambient air quality standards, and criteria air pollutant concentrations and trends in the region. Chapters 2 and 3 present a description of each of the criteria pollutant’s properties, current concentration compared to the state and federal standards, and spatia l, seasonal, and diurnal variations in the

Basin and SSAB.

In 2005, the AQMD monitored concentrations of air pollutants at 34 locations in

southern California’s Los A ngeles, Orange, Riverside a nd San Bernardino counties.

Pollutant concentrations ex ceeded the federal and state standards for ozone and particulate matter (PM10, PM2.5). Sta ndards for carbon monoxide, nitrogen dioxide, sulfur dioxide, sulfate, and lead were not ex ceeded. In the year 2005, the U.S. location with the highest number of days exceeding the federal ozone standard was located in the

Basin.



# South Coast Air Basin

In 2005, there were a total of 89 days on whic h the federal standards for 8-hour ozone or

24-hour PM2.5 were exceeded at one or more Basin locations. (The other criteria pollutants did not exceed the daily federal standards.)

The number of days exceeding the federal oz one standard varied widely by area, from zero to 69 days, depending on location. Ex ceedances were fewest at the coast, increasing to a maximum in the Basin's Ce ntral San Bernardino Mountains and inland valleys. The Central San Bernardino Mount ains area exceeded the federal 8-hour average ozone standard most frequently (69 days). The previous federal 1-hour ozone

standard was exceeded on 18 da ys. The more stringent 1-hour and 8-hour average state

standards were exceeded on 80 and 102 days, respectively, in the same area. The highest 1-hour average and 8- hour average ozone concentra tion recorded in 2005 (0.182 ppm and 0.145 ppm) were 146 pe rcent and 171 percent of th e federal 1-hour and 8-hour standards, respectively.

Exceedances of the federal annual PM10 standa rd were confined to Riverside county, primarily in and around the Metropolitan Rive rside County area. The more stringent

state annual PM10 standard was exceeded in a much larger area, covering most of the

# Final 2007 AQMP Appendix II: Current Air Quality

II-S-2 Basin. The federal 24-hour PM10 standard was not exceeded at any of the areas

monitored in the District in 2005. The stat e 24-hour standard, however, was exceeded at

most of the locations monito red, with the Metropolitan Riverside county area exceeding most frequently (56 percent of sampling days). The maximum 24-hour average and

annual PM10 concentr ations (131.0 μg/m 3 

# and 52.0 μg/m 3 

# ) were 87 percent and 103 percent of the federal 24-hour and a nnual standards, respectively.

Maximum 24-hour average and annual aver age PM2.5 concentr ations (132.7 μg/m 3



# recorded in the East San Ga briel Valley area and 21.0 μg/m 3 

# recorded in the Metropolitan Riverside County area) were 203 percent and 139 percent of the federal 24-hour and annual standards, respectively.

In 2005, carbon monoxide concentr ations did not exceed the standards anywhere in the Basin for the third consecutive year. The ma ximum 8-hour average c oncentration of 5.9 ppm, recorded in South Central Los Angele s County, was 62 percent of the federal

standard.



# Riverside County Salton Sea Air Basin

Pollutant concentrations in the Riverside county portion of the SSAB were monitored at two locations in the Coachella Valley in 2005, and exceeded the federal and state

standards for ozone and the state PM10 standa rds. No other standards were exceeded.

The highest 1-hour and 8-hour ozone concentrations record ed in the Coachella Valley in 2005 (0.139 ppm and 0.116 ppm) were 111 per cent and 136 percent of the federal 1- hour and 8-hour standards, respectively. The federal 8-hour ozone standard was exceeded on 39 days in the SSAB in 2005.

The federal 24-hour and annual PM 10 standards were not exceeded at either of the two

locations monitored in SSAB in 2005. The more stringent state standards, however,

were exceeded at both locations. PM2.5 con centrations were below the federal 24-hour

and annual PM2.5 standards.



# Seasonal, Day-of-Week, and Diurnal Variations

Concentrations of pollutants have been f ound to vary by season, day of week, and time of day, and these variations were exam ined for 2003-2005 for ozone , PM2.5 and PM10. Ozone concentrations generally peak in summer. Maximum 24-hour PM10 and PM2.5 concentrations peak in fall and winter months; however, seasonal variations for particulates are not as distin ct as ozone concentration vari ations. Ozone concentrations tend to be higher on weekends than on weekdays and the time of day with highest average ozone concentrations is early af ternoon in the peak ozone area. PM10 and

# Summary

II-S-3 PM2.5 concentrations vary slightly on each day of the week and da y-of-week variations depend on the location. Basinwide particulat e matter variations show slightly higher overall PM2.5 concentrations on Saturday.

# CHAPTER 1

INTRODUCTION

Air Quality Overview

Air Quality Standards and Episode Levels

South Coast Air Quality Management District

South Coast, Salton Sea, and Mojave Desert Air Basins

Weather

Emissions

Air Quality Trends

Air Quality in the District Compar ed to Other Areas of the U.S.

# Chapter 1: Introduction

II-1-1 

# AIR QUALITY OVERVIEW

In 2005, the AQMD monitored ambient air quality for criteria pollutants (ozone, carbon monoxide, nitrogen dioxide , sulfur dioxide, PM10, PM2.5, lead, and sulfate)

at 34 locations in Southern California’s South Coast Air Basin (Basin) and in the neighboring Riverside county portion of the Salton Sea Ai r Basin (SSAB) that are within the District's jurisdic tion. Pollutant concentrations exceeded federal and state standards for ozone and particulate matter (PM10 and PM2.5), while other pollutants were below the standards. Figure 1-1 s hows the maximum pollutant concentrations for 2005 as a percentage of the federal and state standards.

** Higher lead concentrations were r ecorded at special monitoring sites immediately adjacent to sources known

to emit lead.



# FIGURE 1-1

2005 Maximum Pollutant Concentrati ons as Percent of Standards

Maximum 1-hour average and 8-hour averag e ozone concentrations in 2005 (0.182 ppm and 0.145 ppm) were 146 percent and 171 percent of the federal 1-hour and 8- hour standards, respectively. Maximu m 24-hour average and annual average PM10 concentrations (131 μg/m 3 

# and 52.0 μg/m 3 

# ) were 87 percent a nd 103 percent of the

federal 24-hour and annual st andards, respectively. Maximum 24-hour average and annual average PM2.5 conc entrations (132.7 μg/m 3 

# and 21.0 μg/m 3 

# ) were, Percent of Standards

0 50 100 150 200 250 300

Ozone
(1-Hour) Ozone
(8-Hour) Carbon

Monoxide
(8-Hour) Nitrogen

Dioxide
(Annual) Sulfur

Dioxide
(Annual) PM2.5
(Annual) PM10
(Annual) Sulfate
(24-Hour) Lead**
(Quarter) 

# State Standard

Federal Standard

# Final 2007 AQMP Appendix II: Current Air Quality

II-1-2 respectively, 203 percent and 139 percen t of the federal 24-hour and annual

standards.

The highest 8-hour average carbon monoxide concentration of the year (5.9 ppm) was 62 percent of the federal standard . The maximum annual average nitrogen dioxide concentration (0.0313 ppm) was 59 percent of the federal standard; the maximum 1-hour average nitrogen dioxide concentration (0.14 ppm) was 54 percent

of the state standard. The maximum 24-hour sulfate concentration (17.3 μg/m 3 

# ) was 69 percent of the state standard (there is no federal sulfate standard). Sulfur dioxide

and lead concentrations c ontinued to remain well below the federal and state

standards in 2005.



# AIR QUALITY STANDARDS AND EPISODE LEVELS

Both the federal and state governments have adopted ambient air quality standards,

which define the concentration below which long-term exposure to a pollutant is not expected to cause adverse eff ects to public health and welf are. Episode levels have also been established, below which short- term exposures are not expected to be injurious to health. The standards and episode levels are summarized in Tables A-1

and A-2 in the Attachment.

Both standards and episode levels are pe riodically reviewed to incorporate the findings from the most current research ava ilable on the effects of pollutants. In 1997, the U.S. EPA adopted ne w federal air quality standards for particulate matter and ozone. The 8-hour average ozone standa rd (0.08 ppm) was developed to protect the public health against the effects of prolonged exposure and represented a tightening of the previous 1-hour ozone st andard. The 1-hour av erage federal ozone standard was revoked by the U.S. EPA a nd replaced by the 8- hour average ozone

standard. CARB has also established a new 8-hour average state standard (0.07 ppm) effective May 17, 2006.

For particulate matter, federal annual a nd 24-hour standards and a state annual standard for the finest fraction of par ticulate, PM2.5 (particles less than 2.5 micrometers), were established in 1997 to complement the PM10 federal and state standards that cover a full range of inhala ble particulate matter. PM2.5 is believed to be the portion of particulate most inju rious to health, and causes the greatest visibility reduction. Over the years, the forms of the federal 24-hour PM10 standard

and state annual PM10 standard were also revised. In a recent action by U.S. EPA on September 21, 2006, the fe deral 24-hour average PM2.5 standard was revised, significantly strengthening the daily sta ndard for fine particles (from 65 μg/m 3 

# to 35 μg/m 3 

# ). The federal annual average PM10 st andard was revoked, with U.S. EPA finding no evidence of adverse health effect s due to long-term exposure to coarse

# Chapter 1: Introduction

II-1-3 particles at the current standard level. The federal 24-hour PM10 standard and state

24-hour and annual standards were retained.



# SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT

California’s first local air pollution cont rol agency, the Los Angeles County Air Pollution Control District (LAAPCD), wa s formed in 1947, and APCDs were formed in Orange, Riverside, and San Bernardino counties not long afterward. These four agencies combined in 1976 to form the Southern California APCD, which was later replaced by the South Coas t Air Quality Management District and the Mojave Desert AQMD.

The South Coast Air Quality Management District (AQMD or District) was established by state legislation effec tive February 1, 1977, and was assigned jurisdiction over air quality in the South Co ast Air Basin. The District is also responsible for air quality in the Riversid e county area of the Salton Sea Air Basin (SSAB), by contract with the county. Th e region encompassed by the District is shown in Figure 1-2. In 2005, the Dist rict maintained a network of 32 air monitoring stations in the Basin and an a dditional two in the District portions of SSAB (shown in Figure A-1 and Table A-3 in the Attachment).

FIGURE 1-2 South Coast Air Quality Management District COUNTY 

# MDAB

South Coast Air Quality Management District

50 0 SOUTH C OAST AIR B ASIN (SOCA B) MOJAV E DE SE RT AIR BASIN (MDAB)

SCA QMD J URISDIC TION

J UN E 1996 R EVISION MILES 

# LOS ANGELES COUNTY



# RI VER SIDE C OUNT Y KE RN C OUNTY

IMPERIAL COUNT Y SAN DIEGO COUN TY C OUNTY BOUNDAR IES 

# Antel ope Valley

SCAQM D AIR
MONITOR ING STATION 

# COU NTY SAN BERNARDINO 

# SOCAB

ORANGE

COUNTY 

# Coachella Valley



# SSAB

SA LTON SEA AIR B ASIN (SSAB)

# Final 2007 AQMP Appendix II: Current Air Quality

II-1-4 

# SOUTH COAST, SALTON SEA, AND MOJAVE DESERT AIR BASINS

The South Coast Air Basin (Basin) has an area of 6,800 square miles and a population of 16 million in 2005. It incl udes all of Orange county and the nondesert areas of Los Angeles, Riverside, and San Bernardino counties. The Los Angeles urban area (the nation’s second largest) and the Anaheim-Fullerton and

Riverside-San Bernardino urba n areas lie within the Ba sin’s boundaries. About twothirds of the Basin’s population liv es within Los Angeles county.

The Salton Sea Air Basin and the Moja ve Desert Air Basin (MDAB) have a combined area of approximately 32,200 square miles. The two Basins include the desert portions of Los Angele s, Riverside, and San Bern ardino counties, as well as Imperial county and part of Kern county.

The AQMD has jurisdiction over the Coache lla Valley portion of Riverside county in the SSAB. The population in the SSA B portion under the jurisdiction of the District is about 380,000. Th e District also has the jurisdiction over a small portion of the MDAB in eastern Riverside county. The area is sparcely populated desert.



# WEATHER

The South Coast Air Basin is arid, with virtually no ra infall and abundant sunshine during the summer months. It has light wi nds and poor vertical mixing compared to the other large urban areas in the U.S. The combination of poor dispersion and abundant sunshine pr ovide conditions especially fa vorable to the formation of photochemical smog. The Basi n is bounded to the north and east by mountains with maximum elevations exceeding 10,000 feet . The unfavorable combination of meteorology, topography, and emissions from the nation’s second largest urban area result in the Basin having the worst air quality in the U.S.

# Chapter 1: Introduction

II-1-5 

# EMISSIONS

The amount of each of the ma jor pollutants emitted into th e atmosphere of the Basin in 2002 is shown in Figure 1-3. Year 2002 emissions are the ba seline used for the 2007 AQMP. In 2002, annual average daily emissions were approximately 4,800 tons of carbon monoxide (C O), 800 tons of volatile organic compounds (VOC), 1,100 tons of oxides of nitr ogen (NOx), 50 tons of oxides of sulfur (SOx), 500 tons of total suspended particulat e (TSP), 300 tons of directly emitted particulate (PM10), and 100 tons of fine partic ulate (PM2.5). (Additional PM10 forms through chemical reaction of the gaseous pollutants.) Emi ssions vary relatively little by season, but there are large seasonal differences in the atmospheric concentrations of pollutants

due to seasonal variations in the weather. (Details of the 2002 emissions inventory are contained in Appendix III.)

VOCs and NOx are precursors of ozone. NOx and VOC also react to form nitrates and solid organic compounds, which are a significant fraction of PM10. SO 2 

# reacts to form sulfates which are also signifi cant contributors to the Basin’s PM10 and

PM2.5 levels. In addition to the PM 10 formed by the reaction of gaseous precursors, there is directly emitted PM10, most of which is attributed to fugitive

dust sources such as re-entrained road dust, construction activities, farming operations and wi nd-blown dust.

FIGURE 1-3 2002 Average Daily Emissions in the Basin 012345 PM2.5 PM10

TSP SOx NOx VOC

CO

Thousand Tons/Day

# Final 2007 AQMP Appendix II: Current Air Quality

II-1-6 

# AIR QUALITY TRENDS

In 2005, Basin locations excee ded one or more of the fe deral standards on 89 days (based on the current 8-hour ozone and 24-hour PM2.5 standards). Figure 1-4 shows the long-term annual trend of percent "basin-days" exceedan ces of the federal standards for ozone and partic ulates. (A "basin-day" is recorded if any location in

the Basin exceeds the standard . Multiple locations exceed ing on the same day count as a single basin-day.)

Percent Basin-Days

0% 25% 50% 75% 100%

90 92 94 96 98 00 02 04



# O3 (8-Hour) O3 (1-Hour)

PM2.5 (24-Hour) PM10 (24-Hour)



# FIGURE 1-4 Percent Basin-Days Exceedi ng Federal Standards, 1990-2005

# Chapter 1: Introduction

II-1-7 

# AIR QUALITY IN THE DISTRICT COMPARED TO OTHER AREAS OF

THE U.S.

Despite the significant downtrend, the Basin still has some of the worst air quality in the nation in terms of the number of days per year exceeding the federal standards. In 2005, the U.S. location in terms of highest number of days over the federal 8-hour average ozone standard was located in the Basin (Central San Bernardino Mountains, 69 days). Other area with th e greatest number of exceedances outside California was located in the Dallas Metropolitan Area in Texas (18 days).

The Basin did not exceed the federal 24- hour average PM10 standard in 2005 and

the annual PM10 standard was exceeded at one location only. The Basin exceeded the 24-hour average PM2.5 standard by the widest margin nationwide in 2005, but

the 98 th 

# percentile PM2.5 concentration (which is used to compare with the federal PM2.5 standard) was below the standard at all locations monitored in the Basin.

Over the past decade, reductions in ve hicular emissions have reduced carbon monoxide levels throughout the U. S.. The Basin was the last area to cease violating the standard. The AQMD has petitioned fo r redesignation to attainment, since monitoring for the last several years has not shown any violations. In 2005, the

Basin did not exceed the car bon monoxide standard for the third consecutive year. More detailed information on air quality in the U.S. is available in U.S. EPA's annual National Air Quality a nd Emissions Trend Report (see www.epa.gov/airtrends/).

The following two chapters of this re port summarize current air quality in the District. Analyses are presented for:

• Ozone (O 3 

# )

• Carbon monoxide (CO)

• Nitrogen dioxide (NO 2 

# )

• Sulfur dioxide (SO 2 

# )

• Particulate matter (PM10)

• Particulate matter (PM2.5)

• Lead (Pb); and

• Sulfate (SO 4 = 

# ).

Chapters 2 and 3 contain summa ries of air quality in the South Coast Air Basin, and the Riverside county portion of the Salton Sea Air Basin, respectively; Salton Sea Air Basin includes Coachella Valley. Fo r ozone, PM10, and PM2.5 the pollutants

# Final 2007 AQMP Appendix II: Current Air Quality

II-1-8 for which the Basin is still designated as nonattainment, maps are presented which show how air quality varies in different areas in the Basin. Detailed air quality

statistics for each of the District’s monito ring locations in the Basin and SSAB are contained in the Attachment to this report.

# CHAPTER 2
AIR QUALITY IN THE SOUTH COAST AIR BASIN

Air Quality in the South Coast Air Basin

Ozone (O 3 

# )

Suspended Particulate Matter

Particulate Matter (PM10)

Fine Particulate Matter (PM2.5)

Carbon Monoxide (CO)

Nitrogen Dioxide (NO 2 

# )

Sulfur Dioxide (SO 2 

# )

Sulfate (SO 4 = 

# )

Lead (Pb)

# Chapter2 : Air Quality in the South Coast Air Basin

II-2-1 

# AIR QUALITY IN THE SOUTH COAST AIR BASIN

The maximum pollutant concentrations record ed at District monitoring stations in 2005 (see Figure 1-1 in the previous chapter) were all recorded in the densely populated South Coast Air Basin. However, air quality in the Basin varies widely by season and by area.

The prevailing daytime sea breeze tends to tr ansport pollutants from coastal areas into the Basin’s inland valleys, and from there, s till further inland into neighboring areas of the SSAB, as well as the MDAB. Concentr ations of primary pollutants (those emitted directly into the air) are typically highest close to the sources which emit them. However, secondary pollutants (those formed in the air by chemical reaction of precursors) reach maximum concentrations so me distance downwind of the sources that emit the precursors, due to the fact that th e polluted air mass is moved inland many miles by the prevailing winds before maxi mum concentrations are reached.

In 2005, the federal standards were exceeded on a total of 89 days in the Basin. The more stringent state standards were excee ded on 168 days. The Ba sin’s air quality and occurance of exceedances vary with season due to seasonal differences in the weather. High ozone concentrations are generally re corded mainly during the May to October “smog season” and most frequent number of ex ceedances are normally recorded in July and August. Particulate matter (PM10 and PM2. 5) levels do not have a clear pattern like ozone, and high concentrati ons may be recorded throughout the year. However, typically, high PM10 concentra tions are recorded in summer and fall in inland valley areas while coastal areas show high concentr ations mostly during late fall and winter

months. PM2.5 concentrations tend to be higher in fall. Figure 2-1 shows the number of days per month when state or federal standa rds were exceeded in the Basin in 2005.



# OZONE (O 3 

# )

Properties

The Basin's unique air pollution problem was first recognized in the 1940's. Unlike the smog in many other urban areas, Los Angeles smog was worse in summer. Early research showed that ozone was being form ed in the Basin's atmosphere from VOCs and NOx being emitted into the air in the presen ce of steady sunshine . Regular monitoring of total oxidants was begun by the Los A ngeles Air Pollution Control District (LAAPCD) in the 1950’s, and annual maximum 1-hour ozone concentrations in excess of 0.6 ppm were recorded at that time.

# Final 2007 AQMP Appendix II: Current Air Quality

II-2-2 *The term Basin-days represents the number of days a standard was exceeded by at least one

monitoring station in the Basin.



# FIGURE 2-1 Number of Days per Month Exceedi ng State or Federal Standards in 2005

Ozone (O 3 

# ), a colorless gas with a sharp odor, is a highly reactive form of oxygen. High ozone concentrations exist naturally in the stratosphere. Some mi xing of stratospheric ozone downward through the troposphere to the earth's surface does occur; however, the extent of ozone transport is limited. At th e earth's surface in s ites remote from urban areas, ozone concentrations are normally very low (0.03-0.05 ppm).

In urban areas, ozone is formed by a complic ated series of chemical and photochemical reactions between VOCs, NOx, and the oxyge n in the air. A decrease in ozone precursors may or may not give a decreas e in ozone. Ozone concentrations are dependent not only on overall precursor emissions, but on the ratio of VOCs to NOx concentration, the reactivity of the specif ic VOCs present, the spatial and temporal distribution of emissions, and weather.

While ozone is beneficial in the stratosphe re because it filters out skin-cancer-causing ultraviolet radiation, it is a highly reactive oxi dant. It is this reactivity which accounts for its damaging effects on materials, plants, and human health at the earth's surface.

The propensity of ozone to react with orga nic materials causes it to be damaging to living cells, and ambient ozone concentrations in the Basin are frequently sufficient to

cause health effects. Ozone enters th e human body primarily through the respiratory tract and causes respiratory irritation and discomfort, makes breathing more difficult during exercise, and reduces th e respiratory system's ability to remove inhaled particles and fight infection. People with respirator y diseases, children, th e elderly, and people who exercise heavily are more susc eptible to the effects of ozone. Basin-Days Exceeding*

0 10 20 30 40

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ozone

PM10

PM2.5

2 or More Standards

# Chapter2 : Air Quality in the South Coast Air Basin

II-2-3 Plants are sensitive to ozone at concentrati ons well below the health -based standards and ozone is responsible for significant crop damage . Ozone is also responsible for damage to forests and other ecosystems.

8-Hour Ozone Standard

The federal 1-hour ozone standard was revoke d by the U.S. EPA and replaced by the 8- hour average ozone standard. Studies have shown that even relatively low concentrations of ozone, if lasting for several hours, can significantly reduce lung function in normal healthy pe ople. In July 1997, the U. S. Environmental Protection Agency (U.S. EPA) adopted an 8-hour averag e federal ozone standa rd with a level of 0.08 ppm. The 8-hour ozone standard is more stringent than the 1-hour standard and provides greater protection to pub lic health than the 1-hour standard. It is intended to help protect people who spe nd a significant amount of tim e working or playing outdoors -- a group that is particularly vulnerable to the effects of ozone. CARB also established a new 8-hour average state ozone standard of 0.07 ppm effe ctive May 2006. The state 1-

hour ozone standard continues to remain in effect.

The effect of the adopted 8-hour ozone standa rd on this region's attainment of federal ozone standards has been evaluated by comp aring the number of exceedances of the previous 1-hour standard (0. 12 ppm 1-hour average) with th e number of exceedances of 8-hour average concentrations of 0.08 ppm. The number of exceedances in different areas in the Basin and SSAB vary; however, th e federal 8-hour ozone standard level is exceeded more frequently in the inland valleys and adja cent mountains where high ozone concentrations normally occur.

Current Ozone Air Quality

In 2005, the District measured ozone concen trations at 29 regular ambient monitoring locations. The maximum 1-hour average and 8-hour ozone concentra tions in the Basin in 2005 (0.182 ppm and 0.145) were 146 percen t and 171 percent of the federal 1-hour and 8-hour standards, and 192 percent a nd 193 percent of the state standards, respectively. The federal 1-hour ozone sta ndard was exceeded at one or more Basin locations on a total of 30 days, the 8-hour standard was exceeded on 84 days. The

California state 1-hour and 8-hour standard s were exceeded on 102 days and 120 days, respectively. The stage 1 ep isode level (1-hour average ≥ 0.20 ppm) was not exceeded anywhere in the Basin for the second consec utive year, but the h ealth advisory level (0.15 ppm) was exceeded on 11 days.

Figure 2-2 shows the contour diagrams of th e number of days exceeding the federal

1-hour ozone standard in different areas of the Basin in 2005. The 1-hour ozone

standard was exceeded most fre quently in the Basin's Cent ral San Bernardino Mountains and adjacent valleys and in the Santa Clarita Valley area of Los Angeles county. The coastal areas of Los Angeles and Orange c ounties, the metropolitan areas of Los Angeles county and the farthest eastern portion of Coachella Valley (e xtending to the areas near

# Final 2007 AQMP Appendix II: Current Air Quality

II-2-4 the boundary between the Basin and San Di ego county) did not exceed the 1-hour

federal ozone standard.

Figure 2-3 shows the number of days exceeding the 8-hour federal standard in the Basin

in 2005. The federal 8-hour av erage standard was also excee ded most frequently in the

Basin’s Central San Bernardino Mountains and adjacent areas and in the Santa Clarita Valley area. The coastal areas did not exceed the federal 8-hour standard.

The more stringent state standards were exce eded almost everywhere in the Basin with the greatest number of exceedances occurring in the Central San Bernardino Mountains and adjacent valleys (not shown).

As monitored, in 2005, stage 1 episodes were not recorded anywhere in the Basin. Except for one day in 2003, the stage 1 episode level has not been ex ceeded in the Basin

since 1998. There have been no exceedance s of the stage 2 episode level (1-hour average O 3 

# greater than or equal to 0.35 ppm) since 1988 and the stage 3 episode level (1-hour average O 3 

# greater than or equal to 0.50 ppm ) has not been exceeded since 1974.

Tables A-4 and A-5 in the Attachment show the number of exceedances of the federal

1-hour and 8-hour ozone st andard at all District air monitoring sites, for all years for which data was available during the peri od 1990-2005. Tables A- 6 and A-7 show the number of days exceeding stage 1 and stage 2 episode levels a nd the maximum 1-hour ozone concentrations over the time period 1990 to 2005. Please refer to Appendix II of the 2003 AQMP for prior-year statistics (1976-1989).

# Chapter2 : Air Quality in the South Coast Air Basin

II-2-5 FIGURE 2-2

Ozone - 2005 Number of Days Exceeding 1-Hour Federal Standard (1-hour average ozone > 0.12 ppm)

FIGURE 2-3

Ozone - 2005 Number of Days Exceeding 8-Hour Federal Standard (8-hour average ozone > 0.08 ppm)

# Final 2007 AQMP Appendix II: Current Air Quality

II-2-6 Seasonal Variation

Because photochemical reactions require sunli ght to proceed, ozone formation is favored by strong solar radiation. Solar radiation is more intense and of longer duration, and temperature inversions are stronger and more pe rsistent, in summer than in winter. This causes ozone concentrations to be higher in summer than in wi nter. Peak ozone concentrations generally occur near the mi ddle of the day during the period May through

October.

Figure 2-4 shows the number of days per month that one or more monitoring stations

exceeded the federal 8-hour ozone standard level (8-hour average of 0.08 ppm) for the period 1985-2005. Up until the late 1980's it wa s common to have days exceeding the federal ozone standard as early as February and as late as November. By the late 1990's

there were no exceedances in the months of January-Febru ary and November-December. Also, the frequency of exceedances in ea rly spring and fall has been reduced significantly in recent years.

FIGURE 2-4 Number of Days Per Month Exceeding Federal Ozone Standard in the Basin 0 5 10 15 20 25 30 35

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DECDays Exceeding 

# 1985

1990

1995

2000

2005

# Chapter2 : Air Quality in the South Coast Air Basin

II-2-7 Diurnal Variation

Because time and sunlight are required for precursor organic gase s and nitrogen oxides to react to form ozone, peak ozone concentr ations usually occur from afternoon to early evening. By this time, th e prevailing sea breeze has moved the polluted air mass miles inland from the major sources of precursor emissions. Figure 2-5 illustrates the maximum moving 8-hour average ozone concentr ations for each hour of the day in the Basin for the year 2005 (hours shown ar e the beginning of the 8-hour period).

Ozone concentrations in the Basin are typically low during early morning hours, increasing rapidly after s unrise and peaking in the afternoon. However, peak

concentrations occur earlier in the day for coastal areas and la ter in the day for locations further downwind. Examining diurnal varia tion throughout the District, the time of the peak concentration was found to vary from noon - 1 p.m. PST in coastal-central Los Angeles county, to 4 - 7 p.m. in the farthest inland Basin and SSAB locations. In the mountain area where the Basin's highest concen trations have been recorded in recent years, concentrations are usua lly higher at all times and the peak is reached later in the afternoon (around 4 - 5 p.m.) and remains relatively high throughout the evening hours during the smog season. The diurnal pattern and occurrence of the peak concentrations in these areas serve to depict diurnal fo rmation and impact of ozone transport.

FIGURE 2-5

Ozone Diurnal Variation, 2005 Maximum 8-hour Average Concentration for Each Hour in the Basin 50 75 100 125 150

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

HOUR, PSTConcentration, ppm

# Final 2007 AQMP Appendix II: Current Air Quality

II-2-8 Day-of-Week Variation

Since the mid-1970s, it has been documented that ozone concentrations in the Basin are higher on weekends than on weekdays, in sp ite of the fact that ozone pollutant precursors are lower on weekends than on weekdays. Similar effects have been observed in some other metropolitan areas in the nation such as San Francisco, Washington D.C., Philadelphia, and New York.

Figure 2-6 shows the number of station- days exceeding the fe deral 8-hour ozone standard for each day of the week in th e Basin for the year 2005. The number of exceedances was higher on Sundays, follo wed by Saturdays. Average ozone concentrations also show a pattern similar to the average number of exceedances, with weekends tending to be higher than wee kdays. The CARB has sponsored several research projects to study the causes of elevated ozone levels on weeke nds in the Basin. Changes in daily patterns that impact the quantity and temporal loading of emissions have been suggested as st rongly contributing to these observations. Carryover of matured precursors from weekdays to weeke nds is also suggested as a contributing

factor.

*The term station-days represents the total num ber of days the standard was exceeded at any monitoring station in the Basin.



# FIGURE 2-6

Ozone Day-of-Week Variation, 2005 Exceedances of the Federal Standard by Day of Week Station-Days Exceeding*



# 0 30 60 90 120 150



# Mon Tue Wed Thu Fri Sat Sun

# Chapter2 : Air Quality in the South Coast Air Basin

II-2-9 

# SUSPENDED PARTICULATE MATTER

Total suspended particulate (TSP) is the name applied to the complex mixture of solid material suspended in the at mosphere. TSP is collected on a glass fiber filter by means of a high volume sampler. Samples are coll ected for a 24-hour period every sixth day,

and then returned to the Di strict laboratory for chemical analysis to determine the relative concentrations of sulfate, nitrate, and lead. The federal and state standards for

lead and sulfate are based on analyses of TSP samples. In 2005, TSP samples were collected by the District at 12 sites. These samples were analyzed for sulfate, nitrate,

and lead concentrations.

The fine fraction of TSP has greater effect s on health and visibility than the coarse fraction. In 1987 U.S. EPA adopted PM10 st andards, which replaced the earlier TSP standards. PM10 samples are collected on quart z filters with a size selective inlet high volume sampler. The District bega n PM10 monitoring in late 1984.

In 1997, the U.S. EPA adopted new federal ai r quality standards for a subset of fine particulate matter, PM2.5, to complement ex isting PM10 standards that target the full range of inhalable particulate matter. In compliance with the adopted standard, the

District monitored PM2.5 concen trations at 19 sites in 2005.



# PARTICULATE MATTER (PM10)

Properties

Of greatest concern to public health are the particles small enough to be inhaled into the deepest parts of the lung. Respirable pa rticles (particulate matter less than about 10 micrometers in diameter) can accumulate in th e respiratory system and aggravate health problems such as asthma, bronc hitis, and other lung diseases . Children, the elderly, exercising adults, and those suffering from as thma are especially vulnerable to PM10.

PM10 particles are both directly emitted or formed from diverse emission sources. Major sources of directly emitted (primary) PM10 include re-suspende d road dust or soil entrained into the atmosphere by wind or activities such as construction and agriculture. Other components of PM10 form in the at mosphere (secondary PM10) from precursor emissions of the gaseous pollutants.

State PM10 Standard

CARB has revised the state annual PM10 st andard effective July 2003. The new standard is an annual arithmetic mean of 20 μg/m 3 

# (changed from annual geometric mean of 30 μg/m 3 

# ).

# Final 2007 AQMP Appendix II: Current Air Quality

II-2-10 Current PM10 Air Quality

In 2005, the District measured PM10 conc entrations at 20 lo cations throughout the South Coast and Salton Sea Air Basins. Figur e 2-7 shows the contour map of the annual average (arithmetic mean) PM10 concentrations distribution in the Basin in 2005. The areas with the highest annual average PM10 c oncentrations were located in Riverside

and San Bernardino counties close to Metropolitan Riverside county. The maximum annual average recorded (52.0 μg/m 3 

# in the Metropolitan Rive rside county area) was 103 percent of the federal standard.

The federal 24-hour standard was not exceeded anywhere in the Di strict in 2005. The maximum 24-hour average c oncentration (131.0 μg/m 3 

# recorded in South Coastal Los Angeles County area) was 87 percent of the federal 24-hour standard.

The more stringent state annual standard wa s exceeded in a much larger area than the federal annual standard, with almost all of the Basin and all of the Riverside county SSAB recording annual average concentrations above the standard. The state 24-hour

PM10 standard was also exceeded at most locations monitored in the District. The

standard was exceeded most frequently in the Basin’s inland valleys, centered on Metropolitan Riverside county.

FIGURE 2-7 Particulate Matter (PM10) - 2005 Annual Arithmetic Mean, μg/m 3

# Chapter2 : Air Quality in the South Coast Air Basin

II-2-11 The annual arithmetic mean, the percent of da ys exceeding state and federal standards, and the maximum 24-hour average concentra tion for the years 1990 - 2005 are given in

Tables A-8 to A-10 in the Attachment.

Seasonal and Day-of-Week Variation in PM10

PM10 samples are only collected every sixth day (or third day at sites where an intensive monitoring schedule has been adopted) and ex ceedances of the federal standard are relatively infrequent in recent years. As a consequence, seas onal and day-of-week

variations in exceedances of the federal st andard for the last few years cannot be determined accurately. Howeve r, if exceedances of the stat e standard are considered, seasonal and day-of-week patterns do emerge.

Previous analyses of seasona l variations in PM10 show th at the monthly average PM10 concentration and the monthly average number of days exceeding the state standard tend to peak in summer and fa ll in the inland valley area of the Basin where PM10 concentrations are highest. However, in the South Coastal Los Angeles county area, monthly average PM10 concentr ations and the average number of days exceeding the state standard are highest in late fall and winter months.

Figure 2-8 shows the average num ber of days in each month exceeding the state standard

at one or more Basin locations over th e period 2003-2005. The greatest number of

exceedances of the state standard occurred in the summer months. Due to the higher

number of exceedances in the in land valleys, the pattern for the Basin is more similar to

those for individual sites in the inland va lley areas. Figure 2- 9 shows the monthly average PM10 concentrations for the two s ites, Metropolitan Riverside County in inland valleys and South Coastal Los Angeles c ounty. In the inland valley areas, PM10 concentrations are higher in the summer and fa ll months while in th e coastal areas higher

concentrations are recorded in the late fall and winter months.

Day-of-week variations have also been examined, and it was found that the average

weekend concentrations were lower than the weekday average at all sites monitored in

the Basin and SSAB locations. Figure 2-10 shows the average PM10 concentrations by day of week at two representative monito ring sites in the Basin for the period 2003- 2005, based on the Beta Attenuation Monito r (BAM) and Tapered Element Oscillating Microbalance (TEOM) data.

Figure 2-11 shows average PM10 concentrations for each hour of th e day for the year 2005. On average, PM10 concentrations s how a peak around 7-8 a.m., the time of the heaviest morning traffic rush-hour.

# Final 2007 AQMP Appendix II: Current Air Quality

II-2-12 FIGURE 2-8 Basin-Days Exceeding State PM10 Standard by Month, 2003-2005

FIGURE 2-9 Monthly Average PM10 Concentration, 2003-2005 0 2 4 6 8 10 12

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov DecBasin-Days > 50 μg/m3



# 0

20 40 60 80 100



# Jan Feb Mar Apr May Jun Juy Aug Sep Oct Nov DecConcentration, ug/m3 

# Metropolitan Riverside County

South Coastal Los Angeles County

# Chapter2 : Air Quality in the South Coast Air Basin

II-2-13 20 22 24 26 28 30



# Mon Tue Wed Thu Fri Sat Sun

South Coastal Los Angeles CountyConcentration, ug/m3



# FIGURE 2-10

Day-of-Week Variation, 2003-2005 Average PM10 Concentration by Day of Week

FIGURE 2-11 Diurnal Variation, 2005 Average PM10 Concentration for Each Hour of the Day 40 45 50 55 60



# Mon Tue Wed Thu Fri Sat Sun

Metropolitan Riverside CountyConcentration, ug/m3



# 0 10 20 30 40 50 60 70 80

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

HOUR, PSTConcentration, ppm 

# Basin

Metropolitan Riverside County

South Coastal Los Angeles County

# Final 2007 AQMP Appendix II: Current Air Quality

II-2-14 

# FINE PARTICULATE MATTER (PM2.5)

Properties

PM2.5, the fine sized particles less than 2.5 micrometers in diameter, are small enough to penetrate the defenses of the human re spiratory system and lodge in the deepest recesses of the lung, causing potential adverse h ealth impacts. The health effects include increased respiratory symptoms and diseas es such as ashma, bronchitis, acute and chronic respiratory problems like shortness of breath and painful breathing (in children, the elderly and sensitive people ), and premature deaths (mai nly in the elderly due to weaker immune systems). Sources of PM2.5 include diesel-powered vehicles such as buses and trucks, fuel combustion from autom obiles, power plants, industrial processes, and wood burning.

In the Basin, much of the PM10 fraction is act ually finer in size than 2.5 micrometers, a condition which has major implications for both health and atmospheric visibility. Reducing PM2.5 concentrations will therefore not only reduce the threat to the health of the Basin's population, but will also impr ove visual air quality in this region.

The District began monitoring PM2.5 regularly in 1999. In 2005, the District measured

PM2.5 concentrations at 19 lo cations. Samples are collected for a 24-hour period every 3 days at most locations except for a few s ites with high PM2.5 levels where samples are taken every day.

Current PM2.5 Air Quality

Figure 2-12 shows 2005 annual average arithme tic mean PM2.5 concentrations in

different areas of the Basin. Like PM10, PM2.5 concentrati ons were higher in the inland valley areas of Metropolitan Ri verside county. However, PM 2.5 concentrations were also high in the metropolitan areas of Los A ngeles county, mainly due to the secondary formation of smaller-sized particulate re sulting from mobile and stationary source

activities. The maximum annual average recorded (21.0 μg/m 3 

# in the Metropolitan Riverside county area) was 139 percent of th e federal standard. In 2005, the federal

annual PM2.5 standard was exceeded at a pproximately 60 percent of the locations

monitored in the District. The standard wa s not exceeded at the coastal areas of Los Angeles and Orange counties and the San Be rnardino Mountain area in the Basin and Coachella Valley area in SSAB.

The federal 24-hour PM2.5 standard was exceed ed at some locations monitored in the

Basin in 2005. The maximum 24-hour average concentration (132.7 μg/m 3 

# in East San Gabriel Valley) was 203 percent of the federal 24-hour standard.

# Chapter2 : Air Quality in the South Coast Air Basin

II-2-15 Figure 2-12

Fine Particulate Matter (PM2.5) - 2005 Annual Arithmetic Mean, μg/m 3



# The annual arithmetic mean, the percent of days exceeding the federal standards, the maximum 24-hour average c oncentration, and the 98 th 

# percentile concentration for the years 1999 - 2005 are given in Tables A-11 to A-15 in the Attachment.

Seasonal and Day of Week Variation in PM2.5

Seasonal and day-of-week variations in PM2. 5 concentrations are complex and location dependant, and require further analysis to determine the reasons for the variation. Preliminary analysis shows that the PM2.5 c oncentrations tend to be higher in fall. Figure 2-13 shows the average PM2.5 concentra tion for each month in the Basin for the year 2005.

Preliminary analysis of daily variation show s no specific day-of-week pattern in PM2.5 concentrations in the Basin. Figure 2-14 s hows the total number of days exceeding the federal standard in the Basin by day of week for the three-year period 2003-2005.

Figure 2-15 shows average PM2.5 concentrati on for each hour of the day for the period 2003-2005 at two monitoring sites in the Basin. On average, PM2.5 concentrations show a peak around 8-9 a.m.

# Final 2007 AQMP Appendix II: Current Air Quality

II-2-16 FIGURE 2-13 PM2.5 Seasonal Variation, 2005 Monthly Average Concentration in the Basin, ug/m3

FIGURE 2-14 PM2.5 Day-of-Week Variation, 2003-2005 Basin-Days Exceeding the Federa l Standard by Day of Week 0 2 4 6

Mon Tue Wed Thu Fri Sat SunBasin-Days Exceeding 

# 0 5 10 15 20 25

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov DecConcentration, μg/m3

# Chapter 2 Air Quality in the South Coast Air Basin

II-2-17 FIGURE 2-15 Diurnal Variation, 2003-2005 Average PM2.5 Concentration for Each Hour of the Day



# CARBON MONOXIDE (CO)

Properties

Carbon monoxide (CO) is a colorless, odorle ss, relatively inert gas. It is a trace constituent in the unpolluted troposphere, and is produced by both na tural processes and

human activities. In remote areas far from human habitation, carbon monoxide occurs in air at an average background concentration of 0.04 ppm, primarily as a result of natural processes such as forest fi res and the oxidation of methan e. Global atmospheric mixing

of CO from urban and industria l sources creates higher bac kground concentrations (up to 0.20 ppm) near urban areas. The major source of CO in urban areas is incomplete combustion of carbon-containing fuels, mainly gasoline. In 2000, 98 percent of the CO emitted into the Basin's atmosphere was fro m mobile sources. Consequently, CO concentrations are generally hi ghest in the vicinity of majo r concentrations of vehicular

traffic.

Carbon monoxide is a primary po llutant, meaning that it is di rectly emitted into the air, not formed in the atmosphere by chemical reaction of precursors, as is the case with ozone and other secondary pollu tants. Ambient concentrations of CO in the Basin exhibit large spatial and temporal variations, due to variations in the rate at which CO is emitted, and in the meteorological conditions that govern transport and dilution. Unlike ozone, CO tends to reach high concentrations in the fall and winter months. The highest 20 25 30 35 40 45 50

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

HOUR, PSTConcentration, ppm 

# Metropolitan Riverside County

Central Orange County

# Final 2007 AQMP Appendix II: Current Air Quality

II-2-18 concentrations frequently occu r on weekdays at times consis tent with rush hour traffic and late at night during the coolest, most stable portion of the 24-hour day.

When carbon monoxide is inhaled in sufficien t concentration, it can displace oxygen and bind with the hemoglobin in the blood, re ducing the capacity of the blood to carry oxygen. Individuals most at risk from the e ffects of CO include heart patients, fetuses (unborn babies), smokers, and people who exerci se heavily. Normal healthy individuals are affected at higher concentrations, whic h may cause impairment of manual dexterity, vision, learning ability, and performance of work . The results of st udies concerning the combined effects of CO and other polluta nts in animals have shown a synergistic adverse effect after exposure to CO and ozone.

Current Carbon Monoxide Air Quality

The District currently monitors carbon monoxide air quality at 25 of its 34 air monitoring stations. The highe st CO concentrations are found in coastal and central Los Angeles county. The highest 8-hour average CO concentration in 2005 (5.9 ppm) was recorded in South Central Los Angeles county and was 62 percent of the federal standard and 65 percent of the state standa rd. This was the lowest concentration

recorded in the Basin since carbon monoxide monitoring began in this region. The highest 1-hour average concentration in 2005 (7 ppm) was 19 percent of the federal and 33 percent of the state 1-hour standards. C oncentrations in the less urbanized areas of

the Basin and in the SSAB were well below the standards.

In 2005, carbon monoxide standards continued to remain below the standards at all

locations monitored for the third consecutiv e year. Highest concentrations were recorded in Los Angeles county areas, in the areas of South Central Los Angeles County. There have been no exceedances of th e stage 1 episode (federal alert) level (8- hour average CO greater than or equal to 15 ppm) since 1997. Tabl e 1 below shows the

2005 maximum 8-hour average carbon monoxide concentr ations by Basin and county.

The annual number of days exceeding the federal carbon monoxide standard at all monitoring sites during the pe riod 1990-2005 is given in Table A-16 in the Attachment.

Tables A-17 and A-18 list the annual numbe r of federal alerts and maximum CO concentrations for all sites for the years 1990-2005.

The District has requested redesignation to attainment for CO, which is pending at the time of publication of this report.

# Chapter 2 Air Quality in the South Coast Air Basin

II-2-19 TABLE 1 2005 Maximum 8-Hour Average Ca rbon Monoxide Concentrations*



# NITROGEN DIOXIDE (NO 2 

# )

Properties

Nitrogen dioxide (NO 2 

# ) is a reddish-brown gas with a bleach-like odor. Nitric oxide (NO) is a colorless gas, formed from the nitrogen (N 2 

# ) and oxygen (O 2 

# ) in air under conditions of high temperat ure and pressure which are generally present during combustion of fuels; NO reacts rapidly with the oxygen in air to give nitrogen dioxide (NO 2 

# ). NO 2 

# is responsible for the brownish tinge of polluted urban air. The two gases, nitric oxide and nitrogen di oxide, are referred to collectively as oxides of nitrogen (NO

x 

# ). In the presence of sunlight, nitrogen di oxide reacts to give nitric oxide and an oxygen atom. The oxygen atom can react further to give ozone, via a complex series of chemical reactions involving hydrocarbons (VOCs). Nitrogen dioxide may also react to give nitric acid (HNO 3 

# ) which reacts further to give n itrates, which are a component of

PM10.

Nitrogen dioxide is a respirator y irritant and reduces resistan ce to respiratory infection. Children and people with respiratory diseas e are most susceptible to its effects.

Current Nitrogen Dioxide Air Quality

In 2005, the District monitore d nitrogen dioxide concentrati ons at 24 locations. Federal and state standards for nitrogen dioxide were not exceeded at any location. The federal

standard has not been exceeded in the Basin since 1991. Maximum Percent Basin/County 8-Hour Federal Area ppm Standard

South Coast Air Basin Los Angeles 5.9 62% South Central Los Angeles County Orange 3.3 35% Central Orange County Riverside 2.5 26% Metropolitan Riverside County San Bernardino 2.4 25% Central San Bernardino Valley

Salton Sea Air Basin Riverside 0.8 8% Coachella Valley

* Federal standard = 9 pp m

# Final 2007 AQMP Appendix II: Current Air Quality

II-2-20 Table 2 shows the 2005 maximum annual aver age nitrogen dioxide concentrations by Basin and county. The maximum annual average nitrogen dioxide concentration (0.0313 ppm recorded in the Northwest San Bernardino Valley) was 59 percent of the

federal standard. Concentrations in the downwind SSAB areas were much lower. The maximum 1-hour average concentration in th e Basin (0.14 ppm in South Coastal Los Angeles County) was 56 percent of the state standard.

The annual averages, number of days exceed ing the state standard, and maximum 1-hour average concentrations for each individual area of the District for the years 1990-2005 are given in Tables A-19 to A-21 in Attachment.

Though the state and federal standards were not exceeded in 2005, nitrogen dioxide is still a concern since it is a precursor to both ozone and particulate matter. Further control of oxides of nitrogen will be requi red to attain the oz one and particulate

standards.

TABLE 2 2005 Maximum Annual Average Nitr ogen Dioxide Concentrations*



# Maximu m Percent

Basin/Count y Annual Avg. Federal Are a ppm Standar d

South Coast Air Basin Los Angeles 0.0312 58% South Central Los Angeles County; Ponoma/Walnut Valley Orange 0.0249 47% North Orange County Riverside 0.0222 41% Metropo litan Riverside County San Bernardino 0.0313 59% Northwest San Bernardino Valley

Salton Sea Air Basin Riverside 0.0120 22% Coachella Valley

* Federal standard = 0.0534 pp m



# SULFUR DIOXIDE (SO 2 

# )

Properties

Sulfur dioxide (SO 2 

# ) is a colorless gas with a sharp odo r. It reacts in the air to form sulfuric acid (H 2 

# SO 4 

# ), which contributes to acid precip itation, and sulfates, which is a component of PM10 and PM 2.5. Most of the SO 2 

# emitted into the atmosphere is produced by the burning of sulfur-containing fuels.

# Chapter 2 Air Quality in the South Coast Air Basin

II-2-21 At sufficiently high concentrations, sulfur dioxide affects breathing and the lungs’ defenses, and can aggravate respiratory a nd cardiovascular diseases. Asthmatics and people with chronic lung dise ase or cardiovascular disease are most sensitive to its effects. Sulfur dioxide also causes plant da mage, damage to materi als, and acidification

of lakes and streams.

Current Sulfur Dioxide Air Quality

In 2005, sulfur dioxide was meas ured at seven Basin locations. No violations of federal

or state standards occurred. The federal st andards were last ex ceeded in the 1960’s and

the state standard was last exceeded in 1990.

The maximum 24-hour average SO 2 

# concentrations recorded in the District in 2005 are

shown in Table 3. The highest 24-hour average SO 2 

# concentration (0.012 ppm in East San Fernando Valley) was 9 per cent of the federal 24-hour standard. The highest 1-hour average (0.07 ppm in Central Los Angeles) was 29 percent of the state standard.

Detailed statistics including annual av erage and maximum 1-hour average SO 2 

# concentrations for each location monitored for the years 1990-2005 are given in Tables

A-22 and A-23 in the Attachment.

While sulfur dioxide concentrations in the Basin no longer ex ceed standards, SO 2 

# is a precursor of PM10 and sulfate.

TABLE 3 2005 Maximum 24-Hour Average Sulf ur Dioxide Concentrations*

Maximum Percent Basin/County 24-hr Avg. Federal Area ppm Standard

South Coast Air Basin Los Angeles 0.012 9% Southwest Coastal LA County Orange 0.008 6% North Coastal Orange County Riverside 0.011 8% Metropolitan Riverside County San Bernardino 0.004 3% Central San Bernardino Valley

Salton Sea Air Basin

Riverside N.D.

N.D. = No Data. Historical measurements indicate concentrations are below standard.
* Federal standard = 0.14 ppm

# Final 2007 AQMP Appendix II: Current Air Quality

II-2-22 

# SULFATE (SO 4 = 

# )

Properties

Sulfates are chemical compounds wh ich contain the sulfate ion (SO 4 = 

# ), and are part of the mixture of solid materials which make up PM 10 and TSP. Most of the sulfates in the atmosphere are produced by oxidation of sulfur dioxide. Oxidation of sulfur dioxide yields sulfur trioxide (SO 3 

# ) which reacts with water to give sulfuric acid (H 2 

# SO 4 

# ), which contributes to acid precipitation. The reacti on of sulfuric acid with basic substances such as ammonia yields sulfates, a component of PM10.

Current Sulfate Air Quality

In 2005 sulfate concentrations were measured at 12 Basin locations. Table 4 shows the 2005 maximum 24-hour average con centrations in the District by Basin and county. The maximum sulfate concentration (17.3 μg/m 3 

# ) recorded in the District was 69 percent of

the state standard.

The percent of days exceeding the sta ndard and the maximum 24-hour average concentration at each monitoring location fo r the years 1990-2005 are given in Tables

A-24 and A-25 in the Attachment.

TABLE 4 2005 Maximum 24-Hour Average Sulfate Concentrations

Maximum Percent Basin/County 24-hr. Avg. State Area
μg/m 3 

# Standard

South Coast Air Basin Los Angeles 17.3 69% South Central LA County Orange N.D. Riverside 10.3 41% Metropolitan Riverside County San Bernardino 10.9 44% Central San Bernardino Valley

Salton Sea Air Basin

Riverside N.D.

N.D. = No Data. Historical measurements indicat ed concentrations were well below the standard.
* State standard = 25 μg/m3

# Chapter 2 Air Quality in the South Coast Air Basin

II-2-23 

# LEAD (Pb)

Properties

Lead in the atmosphere is present as a mi xture of a number of lead compounds. Leaded gasoline and lead smelters have been the main Basin sources of lead emitted into the air. Due to the phasing out of leaded gasoline, there has been a dramatic reduction in atmospheric lead in the Basin over the past two decades.

Current Lead Air Quality

In 2005 lead concentrations we re measured at eight Basin air monitoring stations, and they were all well below the standards. Table 5 shows the maximum quarterly average

lead concentrations in the District by Basin and county in 2005. The maximum quarterly average lead concentration (0.03 μg/m 3 

# ) was 2 percent of the federal standard.

TABLE 5 2005 Maximum Quarterly Average Lead Concentrations

Maximum Percent
Basin/County Qtr. Avg.* Federal Area

μg /m 3 

# Standar d

South Coast Air Basin Los Angeles 0.03 2% South Central LA County
Orange N.D. Riverside 0.02 1% Metropolitan Riverside County

San Bernardino 0.02 1% Northwest San Bernardino Valle y

Salton Sea Air Basin

Riverside N.D.

N.D. = No Data. Historical measurements indicated concentrations were well below the standard.
* Higher concentrations (0.44 μg/m3) were measured in localized areas near sources known to emit lea d



# In addition to lead measurements at Distri ct air monitoring stations, special monitoring was done in the immediate vicinity of several stationary sources of lead. Data from the special monitoring sites showed that highe r concentrations were reached in very localized areas near sources, with a maximum quarterly average (0.34 μg/m 3 

# ) 23 percent of the federal standard, and a ma ximum monthly average (0.44 μg/m 3 

# ) 29 percent of the

state standard.

# Final 2007 AQMP Appendix II: Current Air Quality

II-2-24 Maximum quarterly average and monthly averag e lead concentrations at each of the regular monitoring sites for the years 1990- 2005 are given in Tabl es A-26 and A-27 in

the Attachment.

# CHAPTER 3
AIR QUALITY IN THE RIVERSIDE COUNTY SSAB

Ozone (O 3 

# )

Particulate Matter (PM10)

Fine Particulate Matter (PM2.5)

Carbon Monoxide (CO)

Nitrogen Dioxide (NO 2 

# )

Sulfur Dioxide (SO 2 

# )

Sulfate (SO 4 = 

# )

Lead (Pb)

# Chapter3 : Air Quality in the Riverside County SSAB

II-3-1 

# AIR QUALITY IN THE RIVERSIDE COUNTY SSAB

In 2005, the District monitored air quality at two locations in the Riverside county portion of the Salton Sea Desert Air Basin (SSAB), both in the Coachella Valley. One monitoring station was located immediately downwind of the dens ely populated Basin,

and the other was located further downwind in the Coachella Valley. The maximum

concentrations recorded at these locations in 2005 are show n in Figure 3-1. Data is provided in the tables attached to this appendix.

In 2005, pollutant concentra tions in the Riverside county SSAB exceeded state and

federal standards for ozone and state standa rd for PM10. The maximum 1-hour average ozone concentration (0.139 ppm) was 139 pe rcent and 111 percent of the state and federal standards, respectively. The ma ximum 8-hour average ozone concentration (0.116 ppm) was 155 percent and 136 percent of the 8-hour state and federal ozone

standards. The maximum annual av erage PM10 concentration (45.7 μg/m 3 

# ) was 223 percent and 91 percent of the state and fede ral annual PM10 standards, respectively.

Federal and state standards for PM2.5, car bon monoxide and nitroge n dioxide were not exceeded. The maximum annual averag e PM2.5 concentration (10.5 μg/m 3 

# ) was 69 percent of

FIGURE 3-1

2005 Maximum Pollutant Concentrati ons as Percent of Standards Riverside County SSAB 

# Standard

0 50 100 150 200 250

Ozone Ozone PM10 PM2.5 Carbon

Monoxide Nitrogen

Dioxide

(1-Hour) (8-Hour) (Annual) (Annual) (8-Hour) (Annual) 

# Coachella ValleyPercent of Standards 

# State Standard

Federal Standard



# Standard

0 50 100 150 200 250

Ozone Ozone PM10 PM2.5 Carbon

Monoxide Nitrogen

Dioxide

(1-Hour) (8-Hour) (Annual) (Annual) (8-Hour) (Annual) 

# Coachella ValleyPercent of Standards 

# State Standard

Federal Standard

# Final 2007 AQMP Appendix II: Current Air Quality

II-3-2 the federal standard. The highest 8-hour average carbon monoxide concentration (0.8 ppm) was 8 percent of the federal st andard. The maximum annual average

NO 2 

# concentration recorded (0.0120 ppm) was 22 percent of the federal NO 2 

# standard.

No measurements of SO 2 

# , sulfate or lead were made in the Riverside county SSAB area

of the District in 2005. Historical measuremen ts in this area showed concentrations of these pollutants to be well below the stat e and federal standards and monitoring was

discontinued.



# OZONE (O 3 

# )

Ozone in the atmosphere of the Riversid e county portion of SSA B is both directly transported from the Basin and formed pr incipally from precursors emitted upwind. These precursors are emitted in greatest quan tity in the coastal and central Los Angeles county areas of the Basin. The Basin’s prev ailing sea breeze causes polluted air to be transported inland. As the ai r is being transported inland, ozone is formed, with peak concentrations occurring in the inland valleys of the Basin in an area extending from eastern San Fernando Valley through the San Gabriel Valley into the Riverside-San Bernardino area and the adjacent mountains. As the air is transported still further inland into the desert areas, ozone concentr ations decrease due to dilution.

The 1-hour federal ozone standa rd level was exceeded on four days in Coachella Valley in 2005. The more stringent 8-hour federal standard was exceeded on 39 days. Ozone concentrations and the number of days exceed ing the federal ozone standard are greatest in summer. There are typically no ex ceedances during the winter months.

The 1-hour and 8-hour state ozone standard s were exceeded on 43 days and 69 days, respectively, in the Coachella Valley in 2005. The health advisory level has not been

exceeded in the Coache lla Valley area since 1999. No stage 1 episode level has been recorded in the Riverside county SSAB area since 1989.

Figure 3-2 shows the total number of days exceeding federal ozone standards at Coachella Valley monitoring sites for the years 1990-2005.

Number of days exceeding th e 1-hour and 8-hour federal oz one standards and episode

levels and the maximum 1-hour ozone concentrations fo r the years 1990-2005 are given in Tables A-4 through A-7 in the Attachment.

# Chapter3 : Air Quality in the Riverside County SSAB

II-3-3 FIGURE 3-2 Ozone, 1990-2005 Number of Days Exceeding Federal Standards in Riverside County SSAB



# PARTICULATE MATTER (PM10)

Although exceedances of the ozone standard in the Coachella Valley area are due to the transport of ozone from the densely populated areas of the Basin upwind, the same

cannot be said for PM10 exceedances. PM10 exceedances in the Coachella Valley are primarily due to locally generated sources of fugitive dust (e.g. construction activities, re-entrained dust from paved ro ad travel, and natural wind-bl own sources) and not as a result of secondary PM10 generated from precurs or gaseous emissions. In addition, the Riverside county SSAB is subject to freque nt high winds which generate wind-blown sand and dust, especially from disturbed soil, that can cause high le vels of PM10. PM10 is the only pollutant which has sometimes re ached higher concentrations in SSAB than

in the Basin.

The federal 24-hour and annual PM10 standa rd levels were not exceeded in the Riverside county part of SSAB in 2005. The maximum 24-hour and annual average PM10 concentrations (106 μg/m 3 

# and 50.2 μg/m 3 

# ) were 70 percent and 90 percent of the

standard. Days Exceeding

0 20 40 60 80 100

90 92 94 96 98 00 02 04

O3 (8-Hour) O3 (1-Hour)

# Final 2007 AQMP Appendix II: Current Air Quality

II-3-4 The maximum annual average PM10 concentr ations in the western portion of the Coachella Valley area, as well as the San Gor gonio Pass area at the eastern edge of the Basin, remained well below the federal PM10 standards in 2005.

In 2005, the state 24-hour PM10 standard wa s exceeded on a maximum of 39 days (34 percent of sampling days) in the Coachella Va lley. The state annual standard was also

exceeded. The maximum annua l average concentration was 223 percent of the state

standard.

Annual average, percent number of days exceeding standards, and maximum 24-hour average concentrations for the years 1985-2005 for the Riverside county SSAB and other District air monitoring stations are pres ented in the Attachment, in Tables A-8 to

A-10.



# FINE PARTICULATE MATTER (PM2.5)

PM2.5 has been measured in Coachella Valley since 1999 when the District began PM2.5 monitoring. In 2005, fede ral PM2.5 standards were not exceeded at either of the two Riverside county SSAB air monitoring sites. The maximum 24-hour average and annual average concentrations recorded in 2005 (25.0 μg/m 3 

# and 10.5 μg/m 3 

# ) were, respectively, 38 percent and 70 percent of th e federal 24-hour and annual standards.



# CARBON MONOXIDE (CO)

Carbon monoxide was measured at one of the Riverside county SSAB air monitoring

stations in 2005. Neither th e federal nor state standards were exceeded. The maximum 8-hour average CO recorded in 2005 (0.8 ppm) was 9 percent of the federal and 8 percent of the state standards. Historical carbon monoxide air quality and trends in the Riverside county SSAB area shows that the ar ea has not exceeded the federal standard

over the last two decades.

Summary statistics for carbon monoxide in the Riverside county SSAB as well as other

District areas are in Tables A-11 to A-12. Table 1 (Chapter 2) shows summary statistics

for the Basin and SSAB in 2005.



# NITROGEN DIOXIDE (NO 2 

# )

Nitrogen dioxide was measured at one of the stations in the Riverside county SSAB in 2005. The maximum annual average nitroge n dioxide concentra tion (0.0120 ppm) was 22 percent of the federal standard and th e maximum 1-hour average (0.10 ppm) was 38 percent of the state 1-hour standard.

# Chapter3 : Air Quality in the Riverside County SSAB

II-3-5 Table 1 (Chapter 2) and Tables A-14 to A-16 in the Attachment contain NO 2 

# summary statistics for the Riverside county SSAB and other District monitoring stations for the year 2005 and earlier years.



# SULFUR DIOXIDE (SO 2 

# )

Sulfur dioxide concentrations were not meas ured in the Riverside county SSAB in 2005. Measurements in past years have shown conc entrations to be well below the state and

federal standards.

Tables A-17 and A-18 in the Attachment contain annual average and maximum 1-hour averages for available y ears for the period 1990-2005 at Riverside county SSAB and other District monitoring stations.



# SULFATE (SO 4 = 

# )

No measurements of sulfate concentrations were made in 2005 at the two monitoring stations in the Riverside county SSAB. Hist orical monitoring has shown concentrations

to be less than the state standard.

The percent of days exceeding the standa rd, and the maximum 24-hour average and annual average sulfate concentrations at e ach monitoring location for past years are presented in the Attachment, in Tables A-19 to A-20.



# LEAD (Pb)

Lead concentrations were not measured at the two Riverside county SSAB stations in 2005. Measurements in past years have show n concentrations to be less than the state

and federal standards.

Maximum quarterly average and monthly average concentrations for past years are given

in Tables A-21 and A-22 in the Attachment.

# ATTACHMENTTABLE A-1AMBIENT AIR QUALITY STANDARDSCALIFORNIA FEDERALAIR POLLUTANT CONCENTRATION DISTRICT METHOD PRIMARY (>) SECONDARY (>)METHODa)Ozoneb,c)0.09 ppm, 1-hour average >0.07 ppm, 8-hour average >b)U.V. Photometry0.12 ppm, 1-hour average0.08 ppm, 8-hour averagec)Same as Primary StandrdChemiluminescenceCarbon Monoxide9.0 ppm, 8-hour average >20 ppm, 1-hour average >Gas Correlation9 ppm, 8-hour average35 ppm, 1-hour averageNoneNon-dispersive Infra-Red SpectrophotometryNitrogen Dioxide0.25 ppm, 1-hour average >Gas Phase Chemiluminescence0.053 ppm, annual averageSame as Primary StandrdGas Phase ChemiluminescenceSulfur Dioxide0.04 ppm, 24-hour average >0.25 ppm, 1-hour average >Ultraviolet PulseFluorescence 0.03 ppm, annual average0.14 ppm, 24-hour average0.50 ppm, 3-hour average Para-rosanilineParticulateMatter (PM10)20μg/m3, annual arithmetic mean >d)50μg/m3, 24-hour average >Size Segregation InletHigh Volume Sampling50μg/m3, annual arithmetic mean150μg/m3, 24-hour averageSame as Primary StandrdInertial Separation andGravimetric AnalysisFine ParticulateMatter (PM2.5)12μg/m3, annual arithmetic meane)Inertial Separation andGravimetric Analysis15μg/m3, annual arithmetic meanf)65μg/m3, 24-hour averagef)*Same as Primary Standrd Inertial Separation andGravimetric AnalysisLead1.5μg/m3, 30-day average >=High Vol. SamplingAtomic Absorption1.5μg/m3, calendar quarterSame as Primary StandrdHigh Vol. SamplingAtomic AbsorptionSulfates25μg/m3, 24-hour average >=High Vol. SamplingIon ChouromatographyHydrogen Sulfide0.03 ppm, 1-hour average >=Cadmium Hydroxide StractanVinyl Chloride0.010 ppm, 24-hour average >= Gas ChouromatographyVisibility ReducingParticlesIn sufficient amount to give anextinction coefficient > 0.23 inversekilometers (visual range less than 10miles), with relative humidity <70%, 8-hour average (10am-6pm, PST) .Nephelometry and AISI TapeSampler (COH)NOFEDERALSTANDARDSa) Reference method as described by the federal government. An equivalent method of measurement may be used as approved by thefederal government.b) Effective May 17, 2006,new state 8-hour average standard was established.c) Effective September 16, 1997, new federal8-hour average standard was established.d) Effective July 5, 2003, standard changed from AGM 30 μg/m3 to AAM 20 μg/m3.e) Effective July 5, 2003, new state standard was established. There was no previous state standard for PM2.5.f) Effective September 16, 1997, new federal standards were established. Therewere no previous standards for PM2.5.* U.S. EPA has recently revised the federal 24-hour PM2.5standard from 65μg/m3to 35μg/m3. The standard is expected tobecome effective in December 2006.Revised September 2006TABLE A-2Episode CriteriaSCAQMD AND CALIFORNIA FEDERALAIR POLLUTANTHEALTH ADVISORY (≥) STAGE I (≥) STAGE II (≥) STAGE III (≥) STAGE I (≥)(ALERT)STAGE II (≥)(WARNING)STAGE III (≥)(EMERGENCY)Ozone 0.15 ppm, 1-hr. avg. 0.20 ppm, 1-hr. avg. 0.35 ppm, 1-hr. avg. 0.50 ppm, 1-hr. avg. 0.2 ppm, 1-hr. avg. 0.4 ppm, 1-hr. avg. 0.5 ppm, 1-hr. avg.Carbon Monoxide 40 ppm, 1-hr. avg.20 ppm, 12-hr. avg.75 ppm, 1-hr. avg.35 ppm, 12-hr. avg.100 ppm, 1-hr. avg.50 ppm, 12-hr. avg.15 ppm, 8-hr. avg. 30 ppm, 8-hr. avg. 40 ppm, 8-hr. avg.Nitrogen Dioxide 0.6 ppm, 1-hr. avg.0.15 ppm, 24-hr. avg1.2 ppm, 1-hr. avg.0.30 ppm, 24-hr. avg.1.6 ppm, 1-hr. avg.0.40 ppm, 24-hr. avg.Sulfur Dioxide 0.50 ppm, 1-hr. avg.0.20 ppm, 24-hr. avg.1.00 ppm, 1-hr. avg.0.70 ppm, 24-hr. avg.2.00 ppm, 1-hr. avg.0.90 ppm, 24-hr. avg.0.3 ppm, 24-hr. avg. 0.6 ppm, 24-hr. avg. 0.8 ppm, 24-hr. avg.Particulate Matter(PM10)350 μg/m3, 24-hr. avg. 420 μg/m3, 24-hr. avg. 500 μg/m3, 24-hr. avg.Fine ParticulateMatter (PM2.5)Sulfates* 25 μg/m3, 24-hr. avg. combined with ozone > 0.20 ppm, 1-hr. avg.Actions to be Taken** Health Advisory toa) Persons withrespiratory andcoronary disease,b) School officials inorder to curtail students'participation in strenuousactivities.First steps inabatement plans.Health Advisory toa) Persons withrespiratory andcoronary disease,b) School officialsin order to curtailstudents' participationin strenuous activities.Intermediate Steps.Abatement actionstaken to reduceconcentration ofpollutant at issue.Mandatory abatementmeasures. Extensiveactions taken toprevent exposure atindicated levels.State can takeaction if local effortsfailed.Open burningprohibited. Reductionin vehicle operationrequested. Industrialcurtailment.Incinerator useprohibited. Reductionin vehicle operationrequired. Furtherindustrial curtailment.Vehicle useprohibited. Industryshut down orcurtailment. Publicactivities ceased.* Episodes based upon these criteria are not classified according to stages.** For ozone, actions a) and b) are taken at Health Advisory level. For all other pollutants, these actions are taken at StageI Episode level.

# TABLE A-3

Air Monitoring Stations and Source/Receptor Areas

SOURCE/RECEPTOR

AREA # AREA* STN #

LOS ANGELES COUNTY

1 Central LA 087 2 Northwest Coastal LA County 091 3 Southwest Coastal LA County 820 4 South Coastal LA County 1 072 4 South Coastal LA County 2 077 6 West San Fernando Valley 074 7 East San Fernando Valley 069 8 West San Gabriel Valley 088 9 East San Gabriel Valley 1 060 9 East San Gabriel Valley 2 591 10 Pomona/Walnut Valley 075 11 South San Gabriel Valley 085 12 South Central LA County 1 084 12 South Central LA County 2 801 13 Santa Clarita Valley 090

ORANGE COUNTY 16 North Orange County 3177 17 Central Orange County 3176 18 North Coastal Orange County 3195 19 Saddleback Valley 1 3186 19 Saddleback Valley 2 3812

RIVERSIDE COUNTY

22 Norco/Corona 4155 23 Metropolitan Riverside County 1 4144 23 Metropolitan Riverside County 2 4146

23 Mira Loma 5212 24 Perris Valley 4149

25 Lake Elsinore Area 4158 29 Banning Airport 4164 30 Coachella Valley 1** 4137 30 Coachella Valley 2** 4157

SAN BERNARDINO COUNTY 32 Northwest San Bernardino Valley 5175 33 Southwest San Bernardino Valley 5817 34 Central San Bernardino Valley 1 5197 34 Central San Bernardino Valley 2 5203 35 East San Bernardino Valley 5204

37 Central San Bernardino Mountains 5181

38 East San Bernardino Mountains 5818

* Source/Receptor areas and numbers are shown in de tail on the map "South Coast Air Quality Management
District and Air Monitoring Areas" which is available from SCAQMD Public Information.

**Salton Sea Air Basin.FIGURE A-1South Coast Air Basin and Adjoining Areas of Salton Sea Air BasinLos Angeles CountyOrange CountySan Bernardino CountyRiverside CountyM I LES02519212522262423323637383028292720183334351741610115123987612131514##SOUTH C OASTAIR BASIN (SCAB)COUNTY LINESAREA LINESAIR MONITORINGSTATIONAREA NUMBERAPR IL 1995 VERSIONSCAQMDAIR MONITORING NETWORKTABLE A-4Ozone - Number of Days Exceeding the Federal Standard ***(0.08 ppm, 8-Hour Average)STN# LOCATION 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 20012002 2003 2004 2005LOS ANGELES COUNTY:060 East San Gabriel Valley 189 71 95 90 82 71 39 18 23 9 16 18 12 21 10 6069 East San Fernando Valley50 58 67 21 23 31 11 6 14 3 11 5 6 20 7 2072 South Coastal Los Angeles County0 1 8 1 2 0 1 0 0 0 0 0 0 0 0 0074 West San Fernando Valley76 75 52 47 35 22 29 3 13 1 0 7 27 49 29 12075 Pomona/Walnut Valley 161 62 61 57 60 56 23 10 21 10 5 3 15 24 13 11084 South Central Los Angeles County 11 3 5 0 1 0 0 0 0 0 0 0 0 0 0 0085 South San Gabriel Valley2 4 2 0 2 0 --087 Central Los Angeles35 26 27 11 23 10 7 3 9 2 4 1 0 2 1 1088 West San Gabriel Valley80 76 81 62 67 55 27 16 17 4 14 9 10 28 9 5090 Santa Clarita Valley84 92 100 59 96 50 46 27 35 13 15 27 56 69 52 47091 Northwest Coastal Los Angeles County10 14 10 9 5 1 4 2 0 0 0 0 0 1 1 1094 Southwest Coastal Los Angeles County 11 0 0 0 0 0* --820 Southwest Coastal Los Angeles County 2----------------------------4* 0591 East San Gabriel Valley 2107 100 125 104 104 87 53 26 38 8 22 31 23 41 16 13ORANGE COUNTY:3176 Central Orange County 18 13 23 7 7 1 1 1 4 0 1 0 0 1 6 03177 North Orange County37 34 33 22 15 9 6 3 4 1 4 2 0 2 0 03186 Saddleback Valley 10 2* ----------3195 North Coastal Orange County5 5 6 1 0 0 0 0 0 0 2 0 0 1 1 03812 Saddleback Valley 2 -- -- -- -- -- -- -- -- -- --8* 2 2 8 2 1RIVERSIDE COUNTY:4137 Coachella Valley 1**21 33 42 48 44 31 354141 Hemet/San Jacinty Valley-- -- -- -- -- -- -- -- --4144 Metropolitan Riverside County112 109 115 102 114 83 74 55 57 27 28 34 38 62 35 334149 Perris Valley85 97 118 106 101 76 68 41 28 7 40 58 41 47 19 34150 Banning/San Gorgonio Pass55 42 29 16 34 19 18 7 2a) -- -- -- -- -- --4155 Norco/Corona-- -- -- -- -- -- -- -- --4157 Coachella Valley 2**7 9 17 16 19 18 184158 Lake Elsinore61 66 60 56 84 54 43 39 44 37 30 46 44 35 21 154163 Temecula Valley -- -- -- -- -- -- -- -- -- --4164 Banning Airport -- -- -- -- -- -- -- -- --33 39 49 52 63 40 39SAN BERNARDINO COUNTY:5175 Northwest San Bernardino Valley71 70 102 74 91 82 57 30 40 17 18 33 19 35 18 155181 Central San Bernardino Mountains132 131 148 133 136 93 98 71 90 87 66 74 82 74 66 695197 Central San Bernardino Valley 1105 90 117 84 104 73 62 33 43 16 15 31 22 48 28 235203 Central San Bernardino Valley 2103 97 119 88 118 87 89 65 50 31 26 39 30 45 38 315204 East San Bernardino Valley 1106 125 138 142 121 96 91 79 60 39 50 52 47 72 53 24District Maximum132 131 148 142 136 96 98 79 90 87 66 74 82 74 66 69* Less than 12 full months of data** Salton Sea Air Basin*** Refer to 2003 AQMP for 1976 to 1989 dataTABLE A-5Ozone - Number of Days Exceeding the Federal Standard ***(0.12 ppm, 1-Hour Average)STN# LOCATION 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 20012002 2003 2004 2005LOS ANGELES COUNTY:060 East San Gabriel Valley 1 84 73 91 79 72 63 26 11 19 2* 11 95 11 2 4069 East San Fernando Valley 40 55 47 16 18 20 6 2 7 0 3 21 4 2 2072 South Coastal Los Angeles County 0 0 6 1 1 0 0 0* 0 1 0 00 0 0 0074 West San Fernando Valley 41 53 25 32 7 8 11 0 7 0 0 29 14 2 2075 Pomona/Walnut Valley 1 60 60 56 45 47 47 16 7 18 2 3 15 13 4 3084 South Central Los Angeles County 1 3 1 4 0 0 0 1 0 0 0 0 00 0 0 0085 South San Gabriel Valley 43 48 45 33 21 20 32 6 10 0 2 10 1 0 --087 Central Los Angeles 32 23 23 8 14 5 24 0 5 1 1 00 1 0 0088 West San Gabriel Valley 69 70 71 53 61 44 54 5 14 0 7 13 7 1 2090 Santa Clarita Valley 62 65 71 44 66 26 68 13 16 0 1 932 35 13 11091 Northwest Coastal Los Angeles County 8 9 12 7 2 1 13 0 1 0 0 00 1 0 0094 Southwest Coastal Los Angeles County 1 0 0 1 1 0 0 1 0 0 1 0 00 0 0* --820 Southwest Coastal Los Angeles County 2 -- -- -- -- -- -- -- -- -- -- -- -- -- -- 0* 0591 East San Gabriel Valley 2 103 91 118 96 88 73 49 18 28 3 11 1312 22 5 8ORANGE COUNTY:3176 Central Orange County 1 11 11 22 3 5 2 1 0 2 0* 1 0*0 2 0 03177 North Orange County 35 28 31 13 9 4 5 1 5 0 1 00 1 0 03186 Saddleback Valley 1 11 10 9 7 5 1 2 2 2 0 1* -- -- -- -- --3195 North Coastal Orange County 3 5 3 1 0 0 1 0 0 0 0 00 0 0 03812 Saddleback Valley 2 -- -- -- -- -- -- -- -- -- -- 2* 12 4 0 1RIVERSIDE COUNTY:4137 Coachella Valley 1** 27 22 21* 20 13 9 12 4* 8 1 0 62 4 1 44141 Hemet/San Jacinty Valley 20 23 5 8 13 2 0* -- -- -- -- -- -- -- -- --4144 Metropolitan Riverside County 90 79 75 71 77 52 36 13* 32 3 3 712 18 8 34149 Perris Valley 62 71 83 73 59 36 31 6 8 0 15 194 7 2 14150 Banning/San Gorgonio Pass 43 31 19 8 25 15 11 2 0* a) -- -- -- -- -- --4155 Norco/Corona 13 54 16 17 14 23 2* -- -- -- -- -- -- -- -- --4157 Coachella Valley 2** 10 13 8 3 0 3 0 0 2 1 0 00 0 0 04158 Lake Elsinore 36 45 24 27 27 23 17 4 22 5 1 126 7 2 34163 Temecula Valley -- -- 2 1 0* 0 0* 0* -- -- -- -- -- -- -- --4164 Banning Airport -- -- -- -- -- -- -- -- 25 5 4 1613 27 7 10SAN BERNARDINO COUNTY:5175 Northwest San Bernardino Valley 64 67 81 55 79 67 35 12 30 4 10 145 15 3 85181 Central San Bernardino Mountains 103 90 103 88 107 65 62 29 57 30 17 2622 34 9 185197 Central San Bernardino Valley 1 92 74 88 65 91 57 38 10 32 4 7 138 26 7 95203 Central San Bernardino Valley 2 78 79 85 65 96 61 63 32 39 14 7 186 19 6 95204 East San Bernardino Valley 1 81 91 103 95 98 69 65 35 43 12 11 21*23 38 12 6District Maximum103 91 118 96 107 73 68 35 57 30 17 26 32 38 13 18* Less than 12 full months of data** Salton Sea Air Basin*** Refer to 2003 AQMP for 1976 to 1989 dataTABLE A-6Ozone - Number of Days ofFirst/Second Stage Episodes ***(Days Maximum 1-Hour Average Ozone≥0.20 ppm/≥0.35 ppm)STN# LOCATION 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005060 East San Gabriel Valley 113/0 12/0 16/0 11/0 2/0 3/0 1/0 0/0 1/0 0/0* 0/0 0/0 0/0 0/0 0/0 0/0069 East San Fernando Valley1/0 4/0 8/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0072 South Coastal Los Angeles County0/0 0/0 0/0 0/0 0/0 0/0 0/0* 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0074 West San Fernando Valley0/0 2/0 0/0 0/0 0/0 0/0 1/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0075 Pomona/Walnut Valley 112/0 8/0 10/0 6/0 3/0 2/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0084 South Central Los Angeles County0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0085 South San Gabriel Valley0/0 6/0 5/0 0/0 2/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 --087 Central Los Angeles2/0 0/0 1/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0088 West San Gabriel Valley7/0 10/0 10/0 5/0 2/0 1/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0090 Santa Clarita Valley6/0 8/0 4/0 3/0 6/0 1/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0091 Northwest Coastal Los Angeles County0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0094 Southwest Coastal Los Angeles County 10/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0* --820 Southwest Coastal Los Angeles County 2-- -- ------------------------0/0* 0/0591 East San Gabriel Valley 229/0 34/0 30/0 19/0 10/0 9/0 2/0 0/0 3/0 0/0 0/0 0/0 0/0 0/0 0/0 0/03176 Central Orange County 10/0 2/0 1/0 0/0 1/0 0/0 0/0 0/0 0/0 0/0* 0/0 0/0* 0/0 0/0 0/0 0/03177 North Orange County4/0 1/0 1/0 0/0 2/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/03186 Saddleback Valley 10/0 1/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0* -- -- -- -- --3195 North Coastal Orange County0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/03812 Saddleback Valley 2 -- -- -- -- -- -- -- -- -- --4137 Coachella Valley 1**0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0* 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/04141 Hemet/San Jacinty Valley1/0 0/0 0/0 0/0 0/0 0/0 0/0* -- -- -- -- -- -- -- -- --4144 Metropolitan Riverside County15/0 17/0 6/0 5/0 2/0 3/0 1/0 0/0* 1/0 0/0 0/0 0/0 0/0 0/0 0/0 0/04149 Perris Valley0/0 5/0 1/0 3/0 0/0 1/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/04150 Banning/San Gorgonio Pass4/0 1/0 0/0 0/0 1/0 0/0 0/0 0/0 0/0* -- -- -- -- -- -- --4155 Norco/Corona0/0 7/0 1/0 0/0 0/0 0/0 0/0 -- -- -- -- -- -- -- -- --4157 Coachella Valley 2**0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/04158 Lake Elsinore0/0 1/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/04163 Temecula Valley-- -- 0/0 0/0 0/0* 0/0 0/0* 0/0* -- -- -- -- -- -- -- --5175 Northwest San Bernardino Valley12/0 14/0 15/0 7/0 7/0 6/0 2/0 0/0 1/0 0/0 0/0 0/0 0/0 0/0 0/0 0/05181 Central San Bernardino Mountains16/0 15/0 22/0 5/0 12/0 6/0 4/0 1/0 10/0 0/0 0/0 0/0 0/0 0/0 0/0 0/05197 Central San Bernardino Valley 120/0 16/0 19/0 5/0 9/0 2/0 1/0 0/0 1/0 0/0 0/0 0/0 0/0 0/0 0/0 0/05203 Central San Bernardino Valley 28/0 9/0 17/0 4/0 7/0 4/0 2/0 1/0 1/0 0/0 0/0 0/0 0/0 0/0 0/0 0/05204 East San Bernardino Valley 111/0 16/0 7/0 8/0 8/0 4/0 1/0 1/0 1/0 0/0 0/0 0/0* 0/0 0/0 0/0 0/0* Less than 12 full months of data** Salton Sea Air Basin*** Refer to 2003 AQMP for 1976 to 1989 dataTABLE A-7Ozone - Annual Maximum 1-Hour, ppm***LOCATION 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990087 Central Los Angeles .34 .21 .30 .31/.29 .32 .40 .26 .29 .30 .22 .22 .21 .25 .20060 East San Gabriel Valley1 .38 .32 .40 .45 .41 .35 .36 .39 .31 .36 .31 .30 .30 .33 .23069 East San Fernando Valley.35 .31 .30 .39 .35 .27 .25 .31 .26 .30 .28 .23 .24 .20 .20091 Northwest Coastal Los Angeles County.28 .18/.24/.26 .21 .23 .28 .23 .27/.27 .20 .28 .24 .25 .16072 South Coastal Los Angeles County.16 .15 .19 .21 .20 .23 .22 .30 .27 .23 .18 .17 .16 .16 .12074 West San Fernando Valley.27 .34 .27 .33 .38 .25 .22 .26 .26 .25 .22 .22 .25 .23 .19075 Pomona/Walnut Valley1 .36 .32 .41 .35 .37 .33 .31 .34 .31 .33 .27 .29 .29 .25 .24094 Southwest Coastal Los Angeles County-- -- -- -- -- -- -- -- -- -- .19 .20 .22 .19 .10820 Southwest Coastal Los Angeles County------------------------------090 Santa Clarita Valley.33 .33 .42 .44 .41 .33 .37/.34 .30 .37 .26 .28 .29 .27 .26088 West San Gabriel Valley.34 .32 .32 .32 .36 .29 .26/.29 .27 .24 .24 .21 .30 .25 .23084 South Central Los Angeles County1 .24 .24 .18 .29 .18 .21 .26 .23 .27 .21 .20 .24 .21 .14 .15085 South San Gabriel Valley.35 .32 .43 .39 .39 .35 .39 .33 .27 .31 .24 .28 .30 .26 .19591 East San Gabriel Valley2 -- -- -- -- .49 .39 .36 .38 .34 .39 .35 .33 .34 .34 .293176Central Orange County 1.30.19.29.33.28.26.26.30.25.25.20.22.27.24.183177 North Orange County1 .30 .25 .35 .38 .31 .27 .32 .27 .32 .34 .25 .24 .29 .26 .213195 North Coastal Orange County.16 .18 .22 .21/.16 .20 .18 .25 .25 .21 .17 .16 .13 -- .153186 Saddleback Valley1 .23 .20 .34 .32 .34 .33 .27 .29 .30 .28 .23 .20 .21 .23 .193812 Saddleback Valley2 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --4137Coachella Valley 1**.22.21.20.24.21.19.19.19.20.24.18.17.20.19.174157 Coachella Valley2** .16 .19 .17 .21 .11 .18 .17 .18 .19 .20 -- .16 -- .16 .164155 Norco/Corona .33 .36 .40 .33/.34 .37 .35 .35 .30 .35 .27 .24 .25 .23 .174141 Hemet/San Jacinto Valley.19 .25 .27 -- -- -- -- -- .18* .23 .18 .18 .18 .19 .224144 Metropolitan Riverside County1 .36 .35 .39 .34 .37 .30 .31 .36 .32 .35 .25 .29 .28 .27 .294149 Perris Valley.22 .28 .32 .25 .29 .24 .28 .26 .22 .29 .22 .20 .23 .21 .194150 San Gorgonio Pass .28 .27 .30 .27 .26 .23 .24 .26 .25 .29 .22 .21 .26 .23 .224164 BanningAirport -- -- -- -- -- -- -- -- -- -- -- -- -- -- --4163 Temecula Valley.21 .17 .23 -- -- -- -- -- -- -- -- -- -- -- --4158 Lake Elsinore .20 .23 .30 -- -- -- -- -- -- -- -- -- -- .24 .195203Central San Bernardino Valley 2.32.37.36.34.36.36/.30.32.30.27/.30.25.28.30.295204 East San Bernardino Valley.35 .33 .39 .34/.32 .24 .29 .30 .29 .33/.29 .24 .29 .27 .305175 Northwest San Bernardino Valley-- -- -- -- -- -- -- .36 .32 .33 .29 .28 .35 .32 .295197 Central San Bernardino Valley1 .38 .39 .42 .42 .42 .35/.31 .32 .32 .34 .31 .29 .29 .32 .275181 Central San Bernardino Mountains 1 .23 .32 .33 .40 .31 .35 .32 .28 .34 .30 .26 .29 .29 .27 .33District Maximum.38 .39 .43 .45 .49 .39 .40 .39 .34 .39 .35 .33 .35 .34 .33* Less than 12 full months of data. / Station location change** Salton Sea Air Basin*** Refer to 2003 AQMP for 1955 to 1975 dataTABLE A-7(continued)Ozone - Annual Maximum 1-Hour, ppm***LOCATION 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005087 Central Los Angeles .20 .19 .20 .16 .19 .17 .14 .12 .15 .13 .14 .120.12 0.15 0.11 0.12060 East San Gabriel Valley1 .23 .28 .27 .24 .25 .21 .20 .16 .20 .14 .17 .190.14 0.15 0.13 0.15069 East San Fernando Valley.20 .22 .22 .18 .17 .17 .14 .13 .18 .12 .15 .130.13 0.13 0.14 0.14091 Northwest Coastal Los Angeles County.16 .18 .17 .18 .16 .14 .14 .11 .13 .12 .10 .100.12 0.13 0.11 0.11072 South Coastal Los Angeles County.12 .11 .15 .14 .16 .11 .11 .10 .12 .13 .12 .090.08 0.10 0.09 0.09074 West San Fernando Valley.19 .22 .17 .19 .14 .15 .21 .12 .16 .10 .11 .140.15 0.18 0.13 0.14075 Pomona/Walnut Valley1 .24 .24 .26 .21 .24 .22 .19 .16 .18 .14 .15 .140.15 0.16 0.13 0.14094 Southwest Coastal Los Angeles County.10 .11 .15 .13 .11 .12 .13 .11 .09 .15 .10 .10.09 .11 .07* --820 Southwest Coastal Los Angeles County-- -- -- -- -- -- -- -- -- -- -- -- ---- .12*.09088 West San Gabriel Valley.26 .23 .27 .22 .26 .21 .17 .14 .17 .12 .16 .160.17 0.19 0.16 0.17090 Santa Clarita Valley.23 .24 .22 .22 .26 .21 .17 .16 .18 .12 .13/.180.14 0.15 0.13 0.15084 South Central Los Angeles County1 .15 .16 .17 .12 .12 .09 .10 .08 .09 .12 .09 .080.07 0.08 0.08 0.11085 South San Gabriel Valley.19 .26 .26 .19 .22 .18 .14 .13 .18 .12 .14 .130.11 0.13 0.10 0.08591 East San Gabriel Valley2 .29 .32 .30 .28 .30 .22 .21 .17 .22 .14 .17 .190.15 0.16 0.13 0.163176Central Orange County 1.18.25.22.17.21.13.13.10.11.10*.13.110.10 0.14 0.12 0.103177 North Orange County1 .21 .21 .21 .19 .25 .16 .15 .13 .18 .12 .14 .110.12 0.17 0.10 0.093195 North Coastal Orange County.15 .17 .15 .13 .12 .11 .10 .10 .12 .10 .10 .100.09 0.11 0.10 0.093186 Saddleback Valley1 .19 .24 .16 .16 .18 .15 .14 .13 .16 .10 .13 ------ ----3812 Saddleback Valley2 -- -- -- -- -- -- -- -- -- -- .15 .130.14 0.15 0.12 0.134137Coachella Valley 1**.17.18.15*.17.17.16.16.16.17.13.12.140.14 0.14 0.13 0.144157 Coachella Valley2 ** .16 .18 .14 .16 .12 .14 .12 .11 .13 .13 .11 .110.11 0.12 0.11 0.114155 Norco/Corona .17 .22 .23 .16 .17 .19 .16 -- -- -- -- ------ ----4141 Hemet/San Jacinto Valley.22 .19 .15 .18 .16 .15 .12 -- -- -- -- ------ ----4144 Metropolitan Riverside County.29 .24 .26 .26 .25 .21 .20 .19 .20 .14 .14 .140.16 0.17 0.14 0.144149 Perris Valley.19 .20 .21 .20 .18 .20 .18 .14 .15 .11 .16 .150.15 0.16 0.13 0.134150 San Gorgonio Pass .22 .20 .16 .16 .20 .18 .19 .13 .12/-- -- ------ ----4164 BanningAirport -- -- -- -- -- -- -- -- .17 .14 .14 .150.16 0.17 0.16 0.144163 Temecula Valley-- .17* .13 .13 .10* .11 .10 .10* -- -- -- ------ ----4158 Lake Elsinore .19 .20 .17 .19 .19 .19 .15 .16 .17 .14 .13 .150.14 0.15 0.13 0.155203Central San Bernardino Valley 2.29.25.28.21.25.20.24.20.21.16.15.180.15 0.16 0.16 0.165204 East San Bernardino Valley.30 .25 .27 .27 .23 .24 .22 .20 .22 .15 .15 .17*0.16 0.17 0.16 0.155175 Northwest San Bernardino Valley.29 .27 .28 .24 .25 .24 .22 .19 .21 .15 .18 .170.14 0.16 0.14 0.155197 Central San Bernardino Valley1 .27 .29 .28 .24 .25 .22 .22 .17 .20 .14 .17 .170.16 0.18 0.15 0.155181 Central San Bernardino Mountains 1 .33 .27 .28 .24 .27 .26 .20 .21 .24 .17 .18 .170.16 0.16 0.16 0.20District Maximum.33 .32 .30 .28 .30 .26 .24 .21 .24 .17 .18 .190.17 0.19 0.16 0.20* Less than 12 full months of data. / Station location change** Salton Sea Air Basin*** Refer to 2003 AQMP for 1955 to 1975 dataTABLE A-8Particulate Matter (PM10)Annual Arithmetic Mean, μg/m3***STN# LOCATION 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005LOS ANGELES COUNTY:060 East San Gabriel Valley 1 55 66 47 43 44 49 45 46 41 56 46 4546 44 35 35069 East San Fernando Valley 52 55 49 45 38 42 42 45 36 44 39 4138 38* 38 34072 South Coast Los Angeles County 1 44 40 39 37 40 39 35 41 32 39 38 3736 33 33 30077 South Coast Los Angeles County 2----------------------------38 43087 Central Los Angeles 53 57 48 47 45 43 41 43 37 45 40 4439 35 33 30090 Santa Clarita Valley 43 47 35 33 36 37 33 33 30 38 33 3233 32 28 26094 Southwest Coastal Los Angeles County 1 41 39 33 37 36 36 33 36 33 36 36 3737 30 31* --820 Southwest Coastal Los Angeles County 2----------------------------25 23ORANGE COUNTY:3176 Central Orange County 1 49 45 40 38 37 44 35 39 36 49 40 3634 33 34 283186 Saddleback Valley 1 43 37 34 34 33 38 30 35 31 37 29 ----------3812 Saddleback Valley 2 -- -- -- -- -- -- -- -- -- 29 28 2631 27 24 19RIVERSIDE COUNTY:4137 Coachella Valley 1** 35 43 30 27 28 27 29 26 26 29 24 2727 27 26 264144 Metropolitan Riverside County 1 78 76 63 72 66 69 61 65 56 72 60 6359 57 56 524149 Perris Valley 59 49 45 50 45 47 40 45 38 50 41 4145 44 41 394150 San Gorgonio Pass 35 38 34 33 35 30 34 38 28 -- -- ----------4155 Norco/Corona -- -- -- 53 53 54 44 50 47 55 49 --45 41 38 324157 Coachella Valley 2** 79 69 43 46 49 52 51 49 48 53 52 5051 50 39 464163 Temecula Valley -- 38 31 27 22 -- -- -- -- -- -- ----------4164 Banning Airport -- -- -- -- -- -- -- -- 27 35 29 3528 29 29 27SAN BERNARDINO COUNTY:5171 Southwest San Bernardino Valley 1 72 68 79 58 50 54 51 51 47 55 -- ----------5181 Central San Bernardino Mountains 37 39 33 31 26 20 24 24 25 27 24 --37* 26* 26 265197 Central San Bernardino Valley 1 78 63 56 57 60 61 55 54 50 60 53 5150 47* 48 505203 Central San Bernardino Valley 2 65 61 57 56 54 57 53 51 46 57 50 5250 45 49 425204 East San Bernardino Valley -- -- -- 45 47 48 46 43 41 47 46 4741 37 39 335817 Southwest San Bernardino Valley 2 -- -- -- -- -- -- -- -- -- 66 50 5245 43 43 41District Maximum79 76 79 72 66 69 61 65 56 72 60 63 59 57 56 52* Less than 12 full months of data.** Salton Sea Air Basin*** Refer to 2003 AQMP for 1985 to 1989 dataTABLE A-9Particulate Matter (PM10) - Percent of Sampling DaysExceeding State Standard (50 μg/m3)And Federal Standard (150 μg/m3)***STN# LOCATION 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005LOS ANGELES COUNTY:060 East San Gabriel Valley 1 50/0 68/039/0 32/0 40/0 40/2 41/0 40/0 28/0 58/0 42/0 38/040/0 35/0 15/0 22/0069 East San Fernando Valley 47/2 50/0 31/3 36/0 18/0 25/0 25/0 30/0 15/0 35/0 23/0 23/012/0 14/0* 12/0 8/0072 South Coast Los Angeles County 1 24/0 24/0 19/0 20/0 18/0 19/0 15/0 18/0 10/0 22/0 21/0 17/09/0 7/0 7/0 9/0077 South Coast Los Angeles County 2-------------------------- -- 20/0 31/0087 Central Los Angeles 52/2 54/2 36/0 43/0 33/0 23/0 18/0 25/0 17/0 33/0 25/0 33/015/0 10/0 8/0 7/0090 Santa Clarita Valley 28/0 23/09/0 15/0 18/0 14/0 9/0 9/0 6/0 21/0 7/0 7/012/0 16/0 3/0 2/0094 Southwest Coastal Los Angeles County 1 26/0 42/0 13/0 15/0 22/0 21/0 8/0 7/0 12/0 10/0 16/0 14/020/0 5/0 13/0* --820 Southwest Coastal Los Angeles County 2-------------------------- -- 0/0* 0/0ORANGE COUNTY:3176 Central Orange County 1 34/2 24/0 20/0 21/0 18/0 23/2 10/0 18/0 20/0 39/0 13/0 20/08/0 10/0 12/0 5/03186 Saddleback Valley 1 29/0 15/0 8/0 12/0 12/0 18/0 7/0 7/0 10/0 10/0 3/0 ---- -- -- --3812 Saddleback Valley 2 -- -- -- -- -- -- -- -- -- 3/0 3/0 5/08/0 4/0 0/0 0/0RIVERSIDE COUNTY:4137 Coachella Valley 1** 15/0 25/2 7/22/0 3/0 4/0 3/0 2/0 5/0 5/0 0/0 2/05/0 7/0 3/0 3/04144 Metropolitan Riverside County 1 75/5 68/364/0 69/7 67/2 62/7 68/2 70/2 54/0 72/2 70/0 67/069/0 57/2 61/0 56/04149 Perris Valley 53/5 43/0 41/0 45/043/0 38/0 33/0 32/0 26/0 50/0 22/0 27/039/0 33/0 25/0 32/04150 San Gorgonio Pass 20/0 30/0 17/0 18/0 23/0 12/0 19/0 25/0 9/0 -- -- ---- -- -- --4155 Norco/Corona -- -- -- 51/2 58/0 47/3 33/0 42/2 40/0 55/0 48/0 33/034/0 26/0 19/0 9/04157 Coachella Valley 2** 70/7 63/5 31/041/0 38/0 44/2 50/0 43/0 40/0 54/0 50/0 45/045/0* 42/0 20/0* 34/04163 Temecula Valley -- 21/0 4/0 3/0 0/0 -- -- -- -- -- -- ---- -- -- --4164 Banning Airport -- -- -- -- -- -- -- -- 4/0 12/0 8/0 13/211/0 15/0 12/0 3/0SAN BERNARDINO COUNTY:5171 Southwest San Bernardino Valley 1 63/767/2 66/3 62/0 44/0 51/5 53/0 36/2 34/0 56/0 -- ---- -- -- --5181 Central San Bernardino Mountains 19/0 13/0 8/0 4/0 5/0 2/0 0/0 0/0 0/0 0/0 0/0 --19/0 0/0* 2/0 0/05197 Central San Bernardino Valley 1 73/5 65/0 59/0 57/0 63/0 57/3 57/0 48/0 47/0 61/0 52/0 57/053/0 54/0* 48/0 48/05203 Central San Bernardino Valley 2 58/3 68/2 60/0 63/0 51/0 53/0 58/0 45/0 38/0 56/0 53/0 52/056/0 39/0 48/0 38/05204 East San Bernardino Valley -- -- --46/0 41/0 41/2 42/0 38/0 32/0 40/0 44/0 45/032/0 26/0 33/0 21/05817 Southwest San Bernardino Valley 2 -- -- -- -- -- -- -- -- -- 67/2 45/0 42/241/0 29/0 29/0 32/0* Less than 12 full months of data.** Salton Sea Air Basin*** Refer to 2003 AQMP for 1985 to 1989 dataTABLE A-10Particulate Matter (PM10)Annual Maximum 24-Hour Average, μg/m3***STN# LOCATION 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005LOS ANGELES COUNTY:060 East San Gabriel Valley 1 127 137 107 101 127 157 100 116 87 103 94 10691 119 83 76069 East San Fernando Valley 161 133 222 93 114 135 110 92 75 82 74 8671 81* 74 92072 South Coast Los Angeles County 1 119 92 67 86 97 146 113 87 69 79 105 9174 63 72 66077 South Coast Los Angeles County 2----------------------------83 131087 Central Los Angeles 152 151 137 104 122 141 138 102 80 88 80 9765 81 72 70090 Santa Clarita Valley 93 81 84 75 66 87 91 67 60 75 64 6261 72 54 55094 Southwest Coastal Los Angeles County 1 127 79 67 91 81 136 107 79 66 69 74 75121 58 52* --820 Southwest Coastal Los Angeles County 2----------------------------47* 44ORANGE COUNTY:3176 Central Orange County 1 158 146 88 92 106 172 101 91 81 122 126 9369 96 74 653186 Saddleback Valley 1 88 94 83 115 91 122 79 86 70 111 60 ----------3812 Saddleback Valley 2 -- -- -- -- -- -- -- -- -- 56 98 6080 64 47 41RIVERSIDE COUNTY:4137 Coachella Valley 1** 83 197 175 58 55 68 130 63 72 104 44 5375 108 79 664144 Metropolitan Riverside County 1 207 179 126 231 161 219 162 163 116 153 139 136130 164 137 1234149 Perris Valley 250 113 115 131 112 145 87 139 98 112 87 86100 142 83 804150 San Gorgonio Pass 89 87 89 87 96 138 122 227 76 -- -- ----------4155 Norco/Corona -- -- -- 164 139 177 94 158 93 136 129 10978 116 76 794157 Coachella Valley 2** 520 340 117 125 97 199 117 144 114 119 114 149139 124 83 1064163 Temecula Valley -- 66 88 105 48 -- -- -- -- -- -- ----------4164 Banning Airport -- -- -- -- -- -- -- -- 62 86 69 21970 79 82 76SAN BERNARDINO COUNTY:5171 Southwest San Bernardino Valley 1 185 158 649 138 138 167 129 208 92 112 -- ----------5181 Central San Bernardino Mountains 88 105 62 73 67 53 45 47 45 47 49 --52* 47* 52 495197 Central San Bernardino Valley 1 475 127 105 143 133 178 130 122 101 116 108 106102 101* 106 1085203 Central San Bernardino Valley 2 235 163 136 139 147 148 136 108 114 134 108 10694 98 118 725204 East San Bernardino Valley -- -- -- 109 138 172 128 103 97 92 109 10283 92 88 615817 Southwest San Bernardino Valley 2 -- -- -- -- -- -- -- -- -- -- 124 16691 149 93 74District Maximum520 340 649 231 161 219 162 227 116 153 139 219 139 164 137 131* Less than 12 full months of data.** Salton Sea Air Basin*** Refer to 2003 AQMP for 1985 to 1989 dataTABLE A-11Fine Particulate Matter (PM2.5)Annual Arithmetic Mean, μg/m3STN# LOCATION 1999 2000 2001 2002 2003 2004 2005LOS ANGELES COUNTY:060 East San Gabriel Valley25.6 20.1 21.8 20.8 19.2 18.4 17.0*069 East San Fernando Valley23.3 23.8* 24.9 24.0 20.9 19.2 17.9072 South Coastal Los Angeles County 121.5 19.2* 21.4 19.5 18.0 17.6 16.0074 West San Fernando Valley17.5* 18.1 18.5 18.9 16.4 15.6 13.9077 South Coastal Los Angeles County 2-- -- -- -- -- 16.6 14.7084 South Central Los Angeles County24.2 23.0 24.5 23.3 20.2 18.5 17.5085 South San Gabriel Valley25.7 24.1 26.1 23.9 20.6 19.9 17.0*087 Central Los Angeles23.1 22.0 22.9 21.8 21.3 19.6 18.1088 West San Gabriel Valley20.6* 19.3 20.9 20.3 18.6 16.6 15.1ORANGE COUNTY:3176 Central Orange County24.4 21.0* 22.4* 18.6 17.3 16.8 14.73812 Saddleback Valley16.8* 14.7 15.8 15.5 13.1 12.1 10.7RIVERSIDE COUNTY:4137 Coachella Valley 1**-- 9.6 10.8 10.0 9.0 9.0 8.4*4144 Metropolitan Riverside County 130.9 28.2* 31.1 27.5 24.9 22.1 21.04146 Metropolitan Riverside County 226.9 25.5 28.3 27.1 22.6 20.8 18.04157 Coachella Valley 2**12.6* 11.2 12.2 12.0 11.4 10.7 10.5SAN BERNARDINO COUNTY:5197 Central San Bernardino Valley 125.9 24.5 24.8 24.3 21.8 20.0 18.95203 Central San Bernardino Valley 225.7 25.4* 26.2 25.7 22.2 22.0 17.45817 Southwest San Bernardino Valley25.7 24.2 26.2 25.2 23.8 20.9 18.85818 East San Bernardino Mountains10.3 10.6 10.9 11.3 10.5 9.5 12.1District Maximum30.9 28.2 31.1 27.5 24.9 22.1 21.0* Less than 12 full months of data.** Salton Sea Air BasinTABLE A-12Fine Particulate Matter (PM2.5) - Percent of Sampling DaysExceeding Federal Standard (65 μg/m3)STN# LOCATION 1999 2000 2001 2002 2003 2004 2005LOS ANGELES COUNTY:060 East San Gabriel Valley2 1.5 1.3 0.3 1.0 0.4 0.3*069 East San Fernando Valley1 4.3* 3.4 0 1.1 0 0072 South Coastal Los Angeles County 11 1.3* 0.3 0 0.9 0.3 0074 West San Fernando Valley1* 1.9 0.9 0 0 0 0077 South Coastal Los Angeles County 2-- -- -- -- -- 0 0084 South Central Los Angeles County1 1.7 2.6 0 0 0 0085 South San Gabriel Valley2 3.4 3.2 0 0.9 0 0*087 Central Los Angeles2 3.3 1.2 0.3 1.5 0.6 0.6088 West San Gabriel Valley1* 0.9 0.9 0 0.9 0 0ORANGE COUNTY:3176 Central Orange County2 2.2* 0.4* 0.3 0.9 0 03812 Saddleback Valley0* 0.8 0 0 0 0 0RIVERSIDE COUNTY:4137 Coachella Valley 1**-- 0 0 0 0 0 0*4144 Metropolitan Riverside County 16 3.6* 5.8 2.5 2.3 1.5 1.24146 Metropolitan Riverside County 22 4.5 4.7 1.7 0.9 1.8 0.94157 Coachella Valley 2**0* 0 0 0 0 0 0SAN BERNARDINO COUNTY:5197 Central San Bernardino Valley 13 1.8 3.5 0.9 0.9 1.0 0.95203 Central San Bernardino Valley 24 2.9* 4.5 2.6 0.8 3.8 0.95817 Southwest San Bernardino Valley2 1.8 1.8 0 2.5 1.8 0.95818 East San Bernardino Mountains0 0 0 0 0 0 0District Maximum6 4.5 5.8 2.6 2.5 3.8 1.2* Less than 12 full months of data.** Salton Sea Air BasinTABLE A-13Fine Particulate Matter (PM2.5) - Percent of Sampling DaysExceeding the New Federal Standard (35 μg/m3)***STN# LOCATION 1999 2000 2001 2002 2003 2004 2005LOS ANGELES COUNTY:060 East San Gabriel Valley17 9 14 12 9 8 6*069 East San Fernando Valley18 14* 16 19 14 10 8072 South Coastal Los Angeles County 19 11* 14 9 7 7 4074 West San Fernando Valley8* 8 7 10 7 4 4077 South Coastal Los Angeles County 2-- -- -- -- 10 5 2084 South Central Los Angeles County18 14 16 18 9 7 7085 South San Gabriel Valley20 13 22 19 9 9 9*087 Central Los Angeles15 13 15 13 14 7 7088 West San Gabriel Valley9* 6 8 11 10 6 4ORANGE COUNTY:3176 Central Orange County17 14* 16* 9 7 6 43812 Saddleback Valley4* 4 5 3 3 3 0RIVERSIDE COUNTY:4137 Coachella Valley 1**-- 0 1 1 0 0 0*4144 Metropolitan Riverside County 130 26* 33 25 21 15 114146 Metropolitan Riverside County 225 22 23 24 19 13 54157 Coachella Valley 2**0* 0 0 0 0 0 2SAN BERNARDINO COUNTY:5197 Central San Bernardino Valley 117 19 15 19 14 14 65203 Central San Bernardino Valley 221 21* 23 24 15 15 35817 Southwest San Bernardino Valley22 14 21 18 17 13 75818 East San Bernardino Mountains-- 0 0 0 0 0 4District Maximum30 22 33 25 21 15 11* Less than 12 full months of data.** Salton Sea Air Basin***Effective December 17, 2006, U.S. EPA hasstrengthen the standard level from 65 μg/m3to 35 μg/m3.TABLE A-14Fine Particulate Matter (PM2.5)Annual Maximum 24-Hour Average, μg/m3STN# LOCATION 1999 2000 2001 2002 2003 2004 2005LOS ANGELES COUNTY:060 East San Gabriel Valley81.3 92.5 79.7 72.4 121.2 75.6 132.7*069 East San Fernando Valley79.5 84.4* 94.7 63.0 120.6 60.1 63.2072 South Coastal Los Angeles County 166.9 81.5* 72.9 62.7 115.2 66.6 53.9074 West San Fernando Valley79.0* 67.5 71.1 48.8 47.5 56.2 39.6077 South Coastal Los Angeles County 2-- -- -- -- -- 59.7 50.8084 South Central Los Angeles County67.8 82.1 73.1 64.0 54.8 55.8 54.6085 South San Gabriel Valley85.6 89.5 77.3 61.0 90.3 60.7 58.2*087 Central Los Angeles69.3 87.8 73.4 66.3 83.7 75.0 73.7088 West San Gabriel Valley73.0* 66.3 78.1 57.8 89.0 59.4 62.9ORANGE COUNTY:3176 Central Orange County68.7 113.9* 70.8* 68.6 115.5 58.9 54.73812 Saddleback Valley56.6* 94.7 53.4 58.5 50.6 49.4 35.4RIVERSIDE COUNTY:4137 Coachella Valley 1**-- 28.5 44.7 42.3 21.2 27.1 26.2*4144 Metropolitan Riverside County 1111.2 119.6* 98.0 77.6 104.3 91.7 98.74146 Metropolitan Riverside County 290.0 79.3 74.9 75.5 73.3 93.8 95.04157 Coachella Valley 2**29.6* 28.6 33.5 26.8 26.8 28.5 44.4SAN BERNARDINO COUNTY:5197 Central San Bernardino Valley 198.0 72.9 74.8 66.6 98.1 71.4 96.85203 Central San Bernardino Valley 2121.5 89.8* 78.5 82.1 73.9 93.4 106.35817 Southwest San Bernardino Valley85.8 73.4 71.2 64.8 88.9 86.1 87.85818 East San Bernardino Mountains32.1 29.0 34.6 34.1 35.0 28.6 38.8District Maximum121.5 119.6 98.0 82.1 121.2 93.8 132.7* Less than 12 full months of data.** Salton Sea Air BasinTABLE A-15Fine Particulate Matter (PM2.5)24-Hour Average 98thPercentile Concentration, μg/m3STN# LOCATION 1999 2000 2001 2002 2003 2004 2005LOS ANGELES COUNTY:060 East San Gabriel Valley64 62 61 51 56 54 53069 East San Fernando Valley50 83 69 55 60 49 51072 South Coastal Los Angeles County 151 64 49 47 47 46 41074 West San Fernando Valley40 50 57 45 45 53 36077 South Coastal Los Angeles County 2-- -- -- -- -- 42 38084 South Central Los Angeles County53 63 66 53 52 53 48085 South San Gabriel Valley60 71 67 58 50 52 54087 Central Los Angeles52 73 58 55 61 50 53088 West San Gabriel Valley60 54 55 49 48 47 43ORANGE COUNTY:3176 Central Orange County66 66 59 48 52 48 423812 Saddleback Valley45 37 46 46 38 39 31RIVERSIDE COUNTY:4137 Coachella Valley 1**-- 23 33 23 20 23 254144 Metropolitan Riverside County 179 77 74 66 77 60 584146 Metropolitan Riverside County 262 67 66 64 56 54 414157 Coachella Valley 2**30 26 30 22 25 27 25SAN BERNARDINO COUNTY:5197 Central San Bernardino Valley 166 65 70 57 54 63 485203 Central San Bernardino Valley 272 70 68 66 58 72 435817 Southwest San Bernardino Valley86 65 65 57 67 60 505818 East San Bernardino Mountains31 27 30 32 29 23 37District Maximum86 83 74 66 77 72 58* Less than 12 full months of data.** Salton Sea Air BasinTABLE A-16Carbon Monoxide - Number of Days Maximum 8-Hour Average***Exceeded the Federal Standard (≥9.5 ppm)STN# LOCATION 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005LOS ANGELES COUNTY:060 East San Gabriel Valley 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0069 East San Fernando Valley 10 8 3 0 5 4 0* 0 0 0 0 0 0 0 0 0072 South Coastal Los Angeles County 0 0 0 0* 0 0 0* 0 0 0 0 0 0 0 0 0074 West San Fernando Valley 12 9 1 0 4 2 0 1 0 0 1 0 0 0 0 0075 Pomona/Walnut Valley 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0084 South Central Los Angeles County 1 42 37 31 22 22 13 20 14 10 8 2 0 1 0 0 0085 South San Gabriel Valley 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0*087 Central Los Angeles 2 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0088 West San Gabriel Valley 2 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0090 Santa Clarita Valley 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0091 Northwest Coastal Los Angeles County 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0094 Southwest Coastal Los Angeles County 1 10 7 7 3 5 0 5 1 0 0 0 0 0 0 0 0820 Southwest Coastal Los Angeles County 2-- -- -- -- -- -- -- -- -- -- -- -- -- -- 00591 East San Gabriel Valley 2-- -- -- -- -- -- -- -- -- --000000ORANGE COUNTY:3176 Central Orange County 2 0 0 0 0 0 0 0 0 0* 0 0* 0 0 0 03177 North Orange County 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 03186 Saddleback Valley 1 0 0 0 0 0 0 0 0 0 0 0* -- -- -- -- --3195 North Coastal Orange County 4 0 0 0 0 0 0 0 0 0 0* 0 0 0 0 03812 Saddleback Valley 2 -- -- -- -- -- -- -- -- -- -- 0* 0 0 0 0 0RIVERSIDE COUNTY:4137 Coachella Valley 1** 0 0 0* 0 0 0 0 0 0 0 0 0 0 0 0 04144 Metropolitan Riverside County 1 0 0 0 0 0 0 0 0* 0 0 0 0 0 0 0 04146 Metropolitan Riverside County 2 0 0 0 0 0 0 0 0 0 0* 0 0 0 0 0 04150 San Gorgonio Pass -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --4155 Norco/Corona -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --4158 Lake Elsinore -- -- -- -- -- -- -- -- -- -- 0 0 0 0 0 0SAN BERNARDINO COUNTY:5175 Northwest San Bernardino Valley 0 0* -- -- -- -- -- -- -- -- 0 0 0 0 0 05181 Central San Bernardino Mountains -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --5197 Central San Bernardino Valley 1 0 0* -- -- -- -- -- -- -- -- -- -- -- -- 0* --5203 Central San Bernardino Valley 2 0 0 0 0 0 0 0 0* 0 0 0* 0 0 0 0 05204 East San Bernardino Valley 1 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --* Less than 12 full months of data.** Salton Sea Air Basin*** Refer to 2003 AQMP for 1976 to 1989 dataTABLE A-17Carbon Monoxide - Number of Days Maximum 8-Hour Average***Exceeded the Federal Alert Level (> 15 ppm)STN# LOCATION 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005LOS ANGELES COUNTY:060 East San Gabriel Valley 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0069 East San Fernando Valley 0 0 0 0 0 0 0* 0 0 0 0 0 0 0 0 0072 South Coastal Los Angeles County 0 0 0 0* 0 0 0* 0 0 0 0 0 0 0 0 0074 West San Fernando Valley 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0075 Pomona/Walnut Valley 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0084 South Central Los Angeles County 1 4 3 3 0 0 0 1 1 0 0 0 0 0 0 0 0085 South San Gabriel Valley 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0*087 Central Los Angeles 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0088 West San Gabriel Valley 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0090 Santa Clarita Valley 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0091 Northwest Coastal Los Angeles County 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0094 Southwest Coastal Los Angeles County 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0820 Southwest Coastal Los Angeles County 2-- -- -- -- -- -- -- -- -- -- -- -- -- -- 0 0591 East San Gabriel Valley 2-- -- -- -- -- -- -- -- -- --000 0 0 0ORANGE COUNTY:3176 Central Orange County 0 0 0 0 0 0 0 0 0 0* 0 0* 0 0 0 03177 North Orange County 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 03186 Saddleback Valley 1 0 0 0 0 0 0 0 0 0 0 0* -- -- -- -- --3195 North Coastal Orange County 0 0 0 0 0 0 0 0 0 0 0* 0 0 0 0 03812 Saddleback Valley 2 -- -- -- -- -- -- -- -- -- -- 0* 0 0 0 0 0RIVERSIDE COUNTY:4137 Coachella Valley 1** 0 0 0* 0* 0 0 0 0 0 0 0 0 0 0 0 04144 Metropolitan Riverside County 1 0 0 0 0 0 0 0 0* 0 0 0 0 0 0 0 04146 Metropolitan Riverside County 2 0 0 0 0 0 0 0 0 0 0* 0 0 0 0 0 04150 San Gorgonio Pass -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --4155 Norco/Corona -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --4158 Lake Elsinore -- -- -- -- -- -- -- -- -- -- 0 0 0 0 0 0SAN BERNARDINO COUNTY:5175 Northwest San Bernardino Valley 0 0* -- -- -- -- -- -- -- -- -- -- 0 0 0 05181 Central San Bernardino Mountains -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --5197 Central San Bernardino Valley 1 0 0* -- -- -- -- -- -- -- -- -- -- -- -- 0* --5203 Central San Bernardino Valley 2 0 0 0 0 0 0 0 0* 0 0 0* 0 0 0 0 05204 East San Bernardino Valley 1 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --District Maximum 4 3 3 0 0 0 1 1 0 0 0 0 0 0 0 0* Less than 12 full months of data.** Salton Sea Air Basin*** Refer to 2003 AQMP for 1976 to 1989 dataTABLE A-18Carbon MonoxideAnnual Maximum 8-Hour Average, ppm***STN# LOCATION 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005LOS ANGELES COUNTY:060 East San Gabriel Valley 15.1 5.9 4.9 4.0 4.5 6.3 4.0 4.33.9 3.9 4.9 2.9 2.4 2.6 2 1.7069 East San Fernando Valley13.0 10.6 10.5 8.4 10.7 12.0 9.3 7.4 7.5 9.0 6.14.9 4.6 4.7* 3.7 3.4072 South Coastal Los Angeles County9.1 9.3 8.1 6.9 8.9 6.6 6.9 6.76.6 5.4 5.8 4.7 4.6 4.7 3.4 3.5074 West San Fernando Valley14.9 13.5 9.9 9.0 10.8 10.3 8.5 9.8 9.3 7.6 9.86.0 4.8 4.1 3.5 3.5075 Pomona/Walnut Valley7.5 7.1 8.3 5.5 6.8 6.1 5.0 5.07.3 6.7 4.9 3.4 3.3 4.4 3.1 2.5084 South Central Los Angeles County 116.8 17.418.75 14.63 18.10 13.86 17.3 17.0 13.4 11.0 10.07.7 10.1 7.3 6.7 5.9085 South San Gabriel Valley9.4 9.18.62 6.43 9.29 7.86 8.1 6.2 6.1 5.6 5.34.0 4 4 3.6 2.4*087 Central Los Angeles9.9 9.09.50 6.75 8.43 8.37 8.4 7.9 6.1 6.3 6.04.6 4 4.6 3.2 3.1088 West San Gabriel Valley10.0 9.57.25 6.25 8.50 9.12 7.1 6.0 6.3 6.6 7.45.0 4 3.8 3.4 2.8090 Santa Clarita Valley4.6 5.13.71 3.86 3.86 4.12 3.9 6.8 3.4 3.6 4.93.1 1.9 1.7 3.7 1.3091 Northwest Coastal Los Angeles County8.0 6.15.87 5.43 6.00 5.62 4.5 4.4 4.5 3.8 4.33.0 2.7 2.7 2.3 2.1094 Southwest Coastal Los Angeles County 112.7 11.312.29 10.71 12.00 8.86 11.6 10.3 9.4 8.4 7.05.1 6.1 5 4.4* --820 Southwest Coastal Los Angeles County 2 -- -- -- -- -- -- -- -- -- -- -- ---- -- 3.0* 2.1591 East San Gabriel Valley 2 -- -- -- -- -- -- -- -- -- -- 3.12.5-- 2.3 2.1 2 1.9ORANGE COUNTY:3176 Central Orange County11.7 8.69.37 7.71 8.62 8.00 7.5 5.8 5.3 5.3 6.84.7 5.4 3.9 4.1 3.33177 North Orange County9.6 8.09.14 6.00 8.75 6.62 6.9 6.0 6.1 5.3 6.14.7 4.4 4.1 4 3.13186 Saddleback Valley 15.6 4.87.25 4.13 5.37 4.00 4.0 3.6 3.1 2.5 2.3-- -- -- -- --3195 North Coastal Orange County10.7 8.19.14 7.33 7.86 6.57 7.3 5.8 7.0 6.4 6.34.6 4.3 5.8 4.1 3.23812 Saddleback Valley 2 -- -- -- -- -- -- -- -- -- -- 3.32.4 3.6 1.8 1.6 1.6RIVERSIDE COUNTY:4137 Coachella Valley 1**2.3 2.52.4 2.00 1.87 1.50 1.6 1.4 1.6 1.8 1.61.5 1.2 1.3* 1 0.84144 Metropolitan Riverside County 16.3 7.45.25 7.13 5.75 5.71 5.0 5.8 4.6 4.4 4.33.4 3 3.7 3 2.54146 Metropolitan Riverside County 27.3 6.96.12 6.25 7.25 6.50 5.4 5.0 4.6 4.1 4.34.5 3.9 3.4 2.1 2.44149 Perris Valley-- ---- -- -- -- -- -- -- -- ---- -- -- -- --4155 Norco/Corona-- ---- -- -- -- -- -- -- -- ---- -- -- -- --4157 Coachella Valley 2**-- ---- -- -- -- -- -- -- -- 2.1-- -- -- -- --4158 Lake Elsinore -- -- -- -- -- -- -- -- -- -- 2.02.0 2 1.3* 0.9 1SAN BERNARDINO COUNTY:5175 Northwest San Bernardino Valley6.6 4.6 -- -- -- -- -- -- -- --2.6 1.8 1.6 2.9 2.1 1.85181 Central San Bernardino Mountains-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --5197 Central San Bernardino Valley 14.9 4.4 -- -- -- -- -- -- -- -- -- -- -- -- 2.1* 2.15203 Central San Bernardino Valley 26.0 7.0 5.9 6.0 6.5 6.3 4.6 6.04.6 4.0 4.3 3.3 3.3 4.6 3.3 2.45204 East San Bernardino Valley 1-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --District Maximum 16.817.4 18.8 14.6 18.1 13.9 17.3 17.0 13.5 11.7 10.0 7.710.1 7.3 6.7 5.9* Less than 12 full months of data.** Salton Sea Air Basin*** Refer to 2003 AQMP for 1976 to 1989 dataTABLE A-19Nitrogen Dioxide - Annual Average of All Hours, pphm***(To Be Compared to Federal Standard of5.34 pphm, Annual Average of All Hours)STN# LOCATION 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005LOS ANGELES COUNTY:060 East San Gabriel Valley 1 4.10 4.504.03 4.00 4.30 4.64 4.153.38 3.64 3.90 3.66 3.313.36 2.96 2.04 2.51069 East San Fernando Valley 4.79 4.685.01 4.40 4.97 4.54 4.614.24 4.16 4.56 4.15 4.194.02 3.56* 3.32 2.94072 South Coastal Los Angeles County 3.934.11 3.89 3.57 3.46 3.67 3.42 3.33 3.39 3.42 3.13 3.082.98 2.88* 2.80 2.41074 West San Fernando Valley 3.40 3.993.17 3.06 3.39 3.17 3.072.60 2.66 2.87 2.85 2.662.48 2.6* 2.14 2.02075 Pomona/Walnut Valley 1 5.55 5.50 5.07 4.99 4.80 4.56 4.26 4.33 4.33 5.03 4.35 3.713.65 3.52 3.14 3.12084 South Central Los Angeles County 1 4.084.37 4.55 4.09 4.99 4.63 4.12 4.28 3.93 4.28 3.86 3.693.57 3.12 3.01 --085 South San Gabriel Valley 4.99 4.694.43 4.28 4.49 4.56 3.933.63 3.69 3.91 3.66 3.523.44 3.53 3.05 3.12087 Central Los Angeles 4.67 4.93 4.04 3.32 4.76 4.50 4.36 4.30 3.98 3.91 4.04 3.783.27 3.38 3.28 3.08*088 West San Gabriel Valley 4.74 5.024.23 3.90 4.28 3.75 3.783.41 3.51 3.79 2.96 3.453.35 3.22 2.70 2.78090 Santa Clarita Valley 3.16 3.242.76 2.89 3.27 3.05 -- -- -- 2.84 2.46 2.392.00 2.21 2.04 2.41091 Northwest Coastal Los Angeles County 3.24 2.78 2.84 2.87 2.96 2.78 2.89 2.85 2.71 2.91 2.73 2.512.49 2.31 1.98 1.90094 Southwest Coastal Los Angeles County 1 3.39 2.98 3.20 3.00 3.22 3.05 2.85 2.80 2.95 2.95 2.75 2.502.44* 2.38 3.10* 1.78820 Southwest Coastal Los Angeles County 2----------------------------1.36* 1.34591 East San Gabriel Valley 2 3.77 4.303.53 3.39 3.62 3.80 3.283.00 2.76 3.28 2.90 2.742.72 2.71 2.40 2.24ORANGE COUNTY:3176 Central Orange County 4.69 4.48 3.94 3.54 3.80 3.71 3.19 3.32 3.36 3.27 3.00 2.93*2.44 2.40 1.99 2.113177 North Orange County 4.47 4.26 3.793.87 4.14 3.91 3.54 3.29 3.44 3.51 3.04 2.752.56 2.84 2.52 2.493195 North Coastal Orange County 2.72 2.602.49 2.20 2.44 2.39 2.061.99 2.00 2.09 2.05 1.821.87 1.99 1.51 1.31RIVERSIDE COUNTY:4137 Coachella Valley 1** 2.06 2.08 2.101.95 2.19 2.23 2.10 1.58 1.70 1.95 1.78 1.751.72 1.73* 1.30 1.204144 Metropolitan Riverside County 3.36 3.513.04 2.98 3.20 3.06 2.942.62 2.25 2.25 2.36 2.472.37 2.17 1.72 2.224149 Perris Valley 2.82 -- -- -- -- -- -- -- -- -- -- ---- -- -- --4157 Coachella Valley 2** -- -- -- -- -- -- -- -- -- -- 0.99 ---- -- -- --4158 Lake Elsinore -- -- -- -- 2.12 2.08 1.82 1.65 1.74 2.00 1.75 1.851.73 1.82* 1.51 1.424164 Banning Airport -- -- -- -- -- -- -- -- 2.15 2.43 2.37 2.111.99 1.93* 1.65 1.48SAN BERNARDINO COUNTY:5175 Northwest San Bernardino Valley 4.11 4.28 3.96 4.21 4.15 4.64 3.873.41 3.59 3.98 3.80 3.843.69 3.49 3.05 3.135197 Central San Bernardino Valley 1 3.43 3.77 3.44 3.72 4.03 4.24 3.863.65 3.62 3.88 3.64 3.583.34* 3.07 2.73 3.105203 Central San Bernardino Valley 2 3.93 3.55 3.56 3.76 4.11 4.04 3.843.53 3.39 3.58 3.25 3.032.96 2.70 2.61 2.59District Maximum5.55 5.50 5.07 4.99 4.99 4.64 4.61 4.33 4.33 5.03 4.354.19 4.02 3.56 3.32 3.13* Less than 12 full months of data.** Salton Sea Air Basin*** Refer to 2003 AQMP for 1976 to 1989 dataTABLE A-20Nitrogen Dioxide - Number of Days 1-Hour AverageExceeded the State Standard (> .25 ppm)***STN# LOCATION 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005LOS ANGELES COUNTY:060 East San Gabriel Valley 10 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0069 East San Fernando Valley0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0072 South Coastal Los Angeles County1 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0074 West San Fernando Valley0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0075 Pomona/Walnut Valley 10 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0084 South Central Los Angeles County 11 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0085 South San Gabriel Valley2 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0087 Central Los Angeles3 5 1 0 0 0 0 0 0 0 0 0 0 0 0 0088 West San Gabriel Valley0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0090 Santa Clarita Valley0 0 0 0 0 0 -- -- -- 0 0 0 0 0 0 0091 Northwest Coastal Los Angeles County0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0094 Southwest Coastal Los Angeles County 10 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0820 Southwest Coastal Los Angeles County 2----------------------------0 0591 East San Gabriel Valley 20 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0ORANGE COUNTY:3176 Central Orange County0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 03177 North Orange County0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 03195 North Coastal Orange County0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 03812 Saddleback ValleyRIVERSIDE COUNTY:4137 Coachella Valley 1**0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 04144 Metropolitan Riverside County0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 04149 Perris Valley0 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --4157 Coachella Valley 2**-- -- -- -- -- -- -- -- -- -- 0 -- -- -- -- --4158 Lake Elsinore -- -- -- --0 0 0 0 0 0 0 0 0 0 0 04164 Banning Airport-- -- -- -- -- -- -- -- 1 1 0 0 0 0 0 0SAN BERNARDINO COUNTY:5175 Northwest San Bernardino Valley0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 05197 Central San Bernardino Valley 10 0 0 0 0 0 0 0 0 0 0 0 0 0 0 05203 Central San Bernardino Valley 20 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0* Less than 12 full months of data.** Salton Sea Air Basin*** Refer to 2003 AQMPfor 1976 to 1989 dataTABLE A-21Nitrogen DioxideAnnual Maximum 1-Hour, ppm***STN# LOCATION 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005LOS ANGELES COUNTY:060 East San Gabriel Valley 10.21 0.25 0.15 0.17 0.19 0.22 0.15 0.16 0.14 0.16 0.150.12 0.12 0.12 0.1 0.09069 East San Fernando Valley0.23 0.29 0.19 0.17 0.18 0.18 0.2 0.2 0.14 0.18 0.170.25 0.26 0.14 0.12 0.09072 South Coastal Los Angeles County0.27 0.28 0.18 0.2 0.2 0.21 0.17 0.2 0.16 0.15 0.140.13 0.13 0.14 0.12 0.14074 West San Fernando Valley0.19 0.17 0.17 0.15 0.17 0.14 0.16 0.2 0.14 0.12 0.110.09 0.09 0.13 0.08 0.09075 Pomona/Walnut Valley 10.21 0.22 0.18 0.2 0.17 0.18 0.18 0.15 0.15 0.16 0.140.13 0.11 0.12 0.11 0.08084 South Central Los Angeles County 10.26 0.26 0.25 0.23 0.2 0.21 0.25 0.2 0.16 0.18 0.140.15 0.14 0.13 0.1 0.11085 South San Gabriel Valley0.27 0.25 0.27 0.26 0.24 0.23 0.17 0.15 0.14 0.16 0.140.14 0.12 0.14 0.12 0.09087 Central Los Angeles0.28 0.38 0.3 0.21 0.22 0.24 0.25 0.2 0.17 0.21 0.160.14 0.14 0.16 0.16 0.13088 West San Gabriel Valley0.23 0.32 0.22 0.18 0.18 0.22 0.19 0.17 0.16 0.16 0.170.15 0.15 0.14 0.12 0.10090 Santa Clarita Valley0.15 0.17 0.11 0.13 0.12 0.16 -- -- --0.10 0.10 0.10 0.10 0.12 0.09 0.09091 Northwest Coastal Los Angeles County0.2 0.25 0.17 0.17 0.16 0.2 0.18 0.14 0.13 0.13 0.160.11 0.11 0.12 0.09 0.08094 Southwest Coastal Los Angeles County 10.23 0.21 0.19 0.16 0.22 0.18 0.15 0.17 0.15 0.13 0.13 0.11 0.10 0.12 0.08 --820 Southwest Coastal Los Angeles County 2----------------------------0.09* 0.09591 East San Gabriel Valley 20.19 0.23 0.16 0.16 0.19 0.2 0.14 0.13 0.13 0.14 0.130.12 0.10 0.12 0.12 0.09ORANGE COUNTY:3176 Central Orange County0.21 0.2 0.21 0.2 0.19 0.18 0.15 0.1 0.13 0.12 0.130.12 0.10 0.13 0.12 0.093177 North Orange County0.22 0.2 0.17 0.18 0.23 0.2 .16. 0.15 0.13 0.16 0.12 0.13 0.12 0.16 0.12 0.093195 North Coastal Orange County0.22 0.16 0.15 0.14 0.16 0.18 0.14 0.12 0.12 0.12 0.110.08 0.11 0.11 0.10 0.09RIVERSIDE COUNTY:4137 Coachella Valley 1**0.09 0.09 0.09 0.15 0.08 0.09 0.08 0.07 0.07 0.07 0.070.08 0.10 0.06 0.07 0.104144 Metropolitan Riverside County0.16 0.16 0.23 0.14 0.18 0.15 0.11 0.12 0.1 0.13 0.10.15 0.10 0.09 0.09 0.084149 Perris Valley0.11 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --4157 Coachella Valley 2**-- -- -- -- -- -- -- -- -- -- 0.06 -- -- -- -- --4158 Lake Elsinore-- -- -- -- 0.11 0.21 0.1 0.11 0.090.11 0.08 0.09 0.07 0.08 0.06 0.074164 Banning Airport-- -- -- -- -- -- -- -- 0.26 0.310.21 0.24 0.15 0.09 0.08 0.07SAN BERNARDINO COUNTY:5175 Northwest San Bernardino Valley0.19 0.21 0.14 0.16 0.17 0.2 0.15 0.15 0.14 0.13 0.150.13 0.12 0.11 0.11 0.105197 Central San Bernardino Valley 10.2 0.19 0.14 0.16 0.18 0.17 0.17 0.14 0.15 0.15 0.120.13 0.12* 0.12 0.06 0.105203 Central San Bernardino Valley 20.2 0.16 0.13 0.15 0.16 0.16 0.15 0.14 0.11 0.14 0.10.11 0.11 0.1 0.12 0.0.08District Maximum0.28 0.38 0.3 0.26 0.22 0.24 0.25 0.2 0.26 0.31 0.210.25 0.26 0.16 0.16 0.14* Less than 12 full months of data.** Salton Sea Air Basin*** Refer to 2003 AQMP for 1976 to 1989 dataTABLE A-22Sulfur Dioxide - Annual Average, pphm***STN# LOCATION 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005LOS ANGELES COUNTY:060 East San Gabriel Valley 1 0.11 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --069 East San Fernando Valley0.18 0.09 0.10 0.12 0.07 0.01 0.04 0.03 0.02 0.01 0.010.07 0.05 0.14* 0.26 0.25072 South Coastal Los Angeles County 0.31 0.43 0.370.36 0.31 0.23 0.25 0.24 0.18 0.27 0.15 0.22 0.12 0.23 0.50 0.18074 West San Fernando Valley 0.15 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --084 South Central Los Angeles County 1 0.33 0.30 0.31 0.23 0.26 0.30 -- -- -- -- -- -- -- -- -- --085 South San Gabriel Valley 0.43 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --087 Central Los Angeles 0.170.17 0.15 0.03 0.07 0.10 0.15 0.07 0.08 0.23 0.09 0.28 0.21 0.21* 0.24 0.18088 West San Gabriel Valley 0.15 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --090 Santa Clarita Valley 0.09 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --091 Northwest Coastal Los Angeles County 0.21 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --094 Southwest Coastal Los Angeles County 1 0.35 0.40 0.57 0.31 0.22 0.27 0.25 0.14 0.39 0.40 0.17 0.41 0.08 0.06 0.08* --820 Southwest Coastal Los Angeles County 2 -- -- -- -- -- -- -- -- -- -- -- -- -- -- 0.28* 0.56ORANGE COUNTY:3176 Central Orange County 1 0.18 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --3177 North Orange County 0.11 0.12 0.06 0.06 0.09 0.09 -- -- -- -- -- -- -- -- -- --3190 Central Orange County 2 0.19 0.11 0.11 0.08 -- -- -- -- -- -- -- -- -- -- -- --3195 North Coastal Orange County 0.07 0.07 0.06 0.050.07 0.07 0.01 0.03 0.04 0.070.05 0.15 0.12 0.10 0.16 0.16RIVERSIDE COUNTY:4144 Metropolitan Riverside County 0.03 0.02 0.02 0.030.02 0.01 0.01 0.03 0.11 0.140.08 0.09 0.00 0.21 0.34 0.34SAN BERNARDINO COUNTY:5175 Northwest San Bernardino Valley 0.12 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --5197 Central San Bernardino Valley1 0.01 0.05 0.12 0.00 0.020.06 0.01 0.00 0.07 0.18 0.18 0.21 0.22* 0.08 0.10 0.215203 Central San Bernardino Valley 2 0.01 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --District Maximum 0.43 0.43 0.57 0.36 0.31 0.30 0.25 0.24 0.39 0.40 0.18 0.41 0.22 0.23 0.50 0.56* Less than 12 full months of data.** Salton Sea Air Basin*** Refer to 2003 AQMP for 1976 to 1989 dataTABLE A-23Sulfur DioxideAnnual Maximum 1-Hour Average, ppm***STN# LOCATION 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005LOS ANGELES COUNTY:60 East San Gabriel Valley 0.03 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --69 East San Fernando Valley0.02 0.01 0.03 0.02 0.03 0.01 0.01 0.04 0.01 0.01 0.010.01 0.01 0.01* 0.02 0.0172 South Coastal Los Angeles County 0.05 0.14 0.110.05 0.04 0.14 0.04 0.04 0.08 0.05 0.05 0.05 0.03 0.03 0.04 0.0474 West San Fernando Valley 0.02 - -- -- -- -- -- -- -- -- -- -- -- -- -- --84 South Central Los Angeles County0.04 0.05 0.06 0.03 0.02 0.03 -- -- -- -- -- -- -- -- -- --85 South San Gabriel Valley 0.04 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --87 Central Los Angeles 0.02 0.02 0.05 0.01 0.02 0.01 0.01 0.02 0.14 0.05 0.08 0.03 0.02 0.05* 0.08 0.0788 West San Gabriel Valley 0.02 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --90 Santa Clarita Valley 0.01 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --91 Northwest Coastal Los Angeles County 0.02 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --94 Southwest Coastal Los Angeles County 1 0.31 0.120.15 0.07 0.04 0.06 0.06 0.1 0.030.09 0.17 0.04 0.07 0.03 0.03* --820 Southwest Coastal Los Angeles County 2 -- -- -- -- -- -- -- -- -- -- -- -- -- -- 0.02* 0.04ORANGE COUNTY:3176 Central Orange County 1 0.02 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --3177 North Orange County 0.03 0.04 0.02 0.02 0.02 0.02 -- -- -- -- -- -- -- -- -- --3190 Central Orange County 2 0.03 0.03 0.1 0.02 -- -- -- -- -- -- -- -- -- -- -- --3195 North Coastal Orange County 0.02 0.04 0.02 0.010.02 0.02 0.01 0.03 0.02 0.020.02 0.01 0.03 0.02 0.03 0.01RIVERSIDE COUNTY:4144 Metropolitan Riverside County 0.03 0.02 0.02 0.020.02 0.01 0.01 0.04 0.03 0.030.11 0.02 0.02 0.02 0.02 0.02SAN BERNARDINO COUNTY:5175 Northwest San Bernardino Valley 0.01 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --5197 Central San Bernardino Valley1 0.01 0.05 0.02 0.01 0.030.02 0.01 0.01 0.02 0.01 0.02 0.01 0.03* 0.01 0.01 0.015203 Central San Bernardino Valley 2 0.01 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --District Maximum 0.31 0.14 0.15 0.07 0.04 0.14 0.06 0.1 0.14 0.09 0.17 0.05 0.07 0.05 0.08 0.07* Less than 12 full months of data.** Salton Sea Air Basin*** Refer to 2003 AQMP for 1976 to 1989 dataTABLE A-24Sulfate - Percent of Sampling Days Exceeding the State Standard***(≥25 μg/m3, 24-hour Average)STN# LOCATION1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005LOS ANGELES COUNTY:60 East San Gabriel Valley0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 069 East San Fernando Valley2 0 0 0 0 0 -- -- -- -- -- -- -- -- -- --72 South Coastal Los Angeles County0 0 0 0 0 0 0 0 0 0 2 0 0 0 0 084 South Central Los Angeles County2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 085 South San Gabriel Valley0 0 0 0 2 0 0 0 0 2 0 0 0 0 0 087 Central Los Angeles2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 088 West San Gabriel Valley2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 091 Northwest Coastal Los Angeles County0 0 0 0 2 0 0 0 0 0 0 0 0 0 0 094 Southwest Coastal Los Angeles County0 0 0 0 2 0 0 0 0 0 0 0 0 0 0 --ORANGE COUNTY:3176 Central Orange County 10 0 0 0 0 0 -- -- -- -- -- -- -- -- -- --3186 Saddleback Valley0 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --3190 Central Orange County 20 0 0 0 -- -- -- -- -- -- -- -- -- -- -- --RIVERSIDE COUNTY:4137 Coachella Valley 1**0 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --4144 Metropolitan Riverside County 10 0 0 0 0 2 0 0 0 0 0 0 0 0 0 04146 Metropolitan Riverside County 20 0 0 0 0 0 0 0 0 0 0 0 0 0 0 04149 Perris Valley0 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --4150 San Gorgonio Pass0 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --4157 Coachella Valley 2**0 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --SAN BERNARDINO COUNTY:5171 Southwest San Bernardino Valley0 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --5175 Northwest San Bernardino Valley0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 05181 Central San Bernardino Mountains0 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --5197 Central San Bernardino Valley 10 0 0 0 0 0 0 0 0 0 0 0 0 0 0 05203 Central San Bernardino Valley 20 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0* Less than 12 full months of data.** Salton Sea Air Basin*** Refer to 2003 AQMP for 1976 to 1989 dataTABLE A-25Sulfate - Maximum 24-Hour Averages***(To Be Compared to State Standard of 25 μg/m3, 24-Hour Average)STN# LOCATION 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005LOS ANGELES COUNTY:60 East San Gabriel Valley16.0 19.2 16.8 19.1 17.5 12.9 17.1 12.7 10.2 17.8 17.214.1 11.3 11.7 10.6 10.269 East San Fernando Valley 25.9 18.6 12.9 20.1 18.3 13.7 -- -- -- -- -- -- -- -- -- --72 South Coastal Los Angeles County 22.6 19.9 22.615.6 17.1 16.9 19.9 11.4 14.5 13.7 26.7 15.9 17.8 17.8 15.9 16.884 South Central Los Angeles County 28.1 22.4 18.7 13.7 23.1 18.8 16.0 11.4 12.0 15.6 11.4 15.4 15.3 14.9 14.7 17.385 South San Gabriel Valley21.1 21.6 17.0 15.5 26.2 16.3 13.7 13.1 12.0 25.6 13.114.5 11.2 14.4 12.4 9.987 Central Los Angeles 25.3 23.1 19.4 17.6 21.7 15.5 12.8 14.3 10.6 17.9 16.4 15.9 15.2 14.6 12.7 14.288 West San Gabriel Valley28.4 20.1 11.5 18.8 14.5 13.2 12.0 11.6 9.2 16.4 13.913.4 10.5 12.7 11.2 11.291 Northwest Coastal Los Angeles County 24.8 20.9 12.3 18.1 26.8 13.3 12.2 14.0 11.2 13.9 14.1 15.6 14.6 14.3 11.4 11.794 Southwest Coastal Los Angeles County 24.8 24.717.6 20.5 26.7 20.4 18.4 14.4 13.518.8 16.2 20.6 15.6 16.4 13.1 --ORANGE COUNTY:3176 Central Orange County 1 18.3 20.616.0 15.3 14.5 12.8 -- -- -- -- -- -- -- -- -- --3186 Saddleback Valley 13.4 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --3190 Central Orange County 2 16.8 16.9 16.0 14.7 -- -- -- -- -- -- -- -- -- -- -- --RIVERSIDE COUNTY:4137 Coachella Valley 1** 5.6 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --4144 Metropolitan Riverside County 1 19.9 14.8 12.3 13.720.4 26.3 14.9 13.1 10.1 10.711.0 10.7 11.7 10.1 9.8 10.34146 Metropolitan Riverside County 2 19.3 12.8 12.1 15.115.7 22.9 17.0 10.4 12.8 10.6 10.2 9.2 10.5 10 9.1 10.34149 Perris Valley 12.9 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --4150 San Gorgonio Pass 8.6 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --4157 Coachella Valley 2** 7.0 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --SAN BERNARDINO COUNTY:5171 Southwest San Bernardino Valley 19.9 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --5175 Northwest San Bernardino Valley 18.7 19.0 13.2 17.1 15.812.5 13.6 9.7 10.5 11.7 11.5 10.7 11.5 11.8 9.2 8.45181 Central San Bernardino Mountains 6.6 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --5197 Central San Bernardino Valley1 18.3 20.2 13.4 16.7 15.513.4 13.6 10.2 10.1 12.4 10.7 10.7 13.5 11.9 10.8 10.45203 Central San Bernardino Valley2 17.3 18.3 12.9 17.2 14.9 12.5 11.2 9.1 11.5 10.9 12.4 12.410.8 12.1 9.6 10.9District Maximum 28.4 24.7 22.6 20.5 26.8 26.3 19.9 14.4 14.5 25.6 26.7 20.6 17.8 17.8 15.9 17.3* Less than 12 full months of data.** Salton Sea Air Basin*** Refer to 2003 AQMP for 1976 to 1989 dataTABLE A-26Lead - Highest Calendar Quarter Mean, μg/m3***(To Be Compared to Federal Standard of 1.5 μg/m3, Calendar Quarter Average)STN# LOCATION19901991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005LOS ANGELES COUNTY:69 East San Fernando Valley 0.070.07 0.09 0.05 0.05 0.04 -- -- -- -- -- -- -- -- -- --72 South Coastal Los Angeles County 0.070.07 0.05 0.05 0.04 0.04 0.08 0.03 0.04 0.05 0.04 0.04 0.02 0.05 0.01 0.0184 South Central Los Angeles County 0.110.10 0.08 0.06 0.07 0.06 0.05 0.07 0.04 0.09 0.06 0.12 0.04 0.04 0.03 0.0285 South San Gabriel Valley 0.110.14 0.10 0.11 0.08 0.06 0.06 0.06 0.05 0.09 0.06 0.05 0.05 0.04 0.02 0.0387 Central Los Angeles 0.090.14 0.11 0.07 0.07 0.06 0.06 0.07 0.04 0.07 0.05 0.05 0.03 0.15 0.03 0.0294 Southwest Coastal Los Angeles County 0.060.06 0.05 0.04 0.04 0.04 0.03 0.05 0.04 0.04 0.05 0.04 0.02 0.10 0.01 --ORANGE COUNTY:3176 Central Orange County 0.060.06 0.03 0.04 0.03 0.04 -- -- -- -- -- -- -- -- -- --RIVERSIDE COUNTY:4144 Metropolitan Riverside County 1 0.050.05 0.03 0.04 0.04 0.04 0.04 0.04 0.04 0.05 0.05 0.03 0.02 0.02 0.01 0.024146 Metropolitan Riverside County 2 0.050.06 0.03 0.04 0.03 0.03 0.03 0.04 0.05 0.04 0.03 0.03 0.02 0.01 0.01 0.01SAN BERNARDINO COUNTY:5175 Northwest San Bernardino Valley 0.050.07 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.05 0.05 0.04 0.02 0.02 0.01 0.025203 Central San Bernardino Valley 0.050.05 0.04 0.04 0.04 0.04 0.04 0.04 0.03 0.05 0.05 0.04 0.02 0.08 0.01 0.01District Maximum 0.110.14 0.11 0.11 0.08 0.06 0.08 0.07 0.05 0.09 0.06 0.12 0.05 0.15 0.03 0.03* Less than 12 full months of data.** Salton Sea Air Basin*** Refer to 2003 AQMP for 1976 to 1989 dataTABLE A-27Lead - Highest Monthly Averages, μg/m3***(To Be Compared to State Standard of 1.5 μg/m3, Monthly Average)STN# LOCATION1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005LOS ANGELES COUNTY:69 East San Fernando Valley 0.08 0.10 0.16 0.05 0.06 0.05 -- -- -- -- -- -- -- -- -- --72 South Coastal Los Angeles County 0.09 0.08 0.070.06 0.06 0.05 0.08 0.05 0.07 0.06 0.05 0.05 0.03 0.10 0.02 0.0184 South Central Los Angeles County 0.14 0.17 0.11 0.08 0.09 0.07 0.09 0.07 0.04 0.17 0.09 0.23 0.04 0.04 0.03 0.0385 South San Gabriel Valley0.13 0.19 0.15 0.15 0.10 0.07 0.09 0.08 0.07 0.21 0.090.07 0.06 0.05 0.03 0.0387 Central Los Angeles 0.09 0.21 0.16 0.10 0.11 0.07 0.08 0.07 0.06 0.13 0.06 0.06 0.05 0.15 0.03 0.0294 Southwest Coastal Los Angeles County 0.08 0.080.05 0.05 0.05 0.04 0.04 0.06 0.060.05 0.08 0.04 0.02 0.17 0.01 --ORANGE COUNTY:3176 Central Orange County 0.10 0.080.05 0.07 0.06 0.04 -- -- -- -- -- -- -- -- -- --RIVERSIDE COUNTY:4144 Metropolitan Riverside County 1 0.08 0.06 0.03 0.050.06 0.04 0.088 0.07 0.08 0.060.06 0.04 0.03 0.02 0.02 0.024146 Metropolitan Riverside County 2 0.08 0.08 0.03 0.040.04 0.05 0.05 0.07 0.10 0.050.04 0.03 0.02 0.02 0.01 0.01SAN BERNARDINO COUNTY:5175 Northwest San Bernardino Valley 0.07 0.08 0.04 0.05 0.05 0.06 0.04 0.04 0.05 0.070.07 0.05 0.02 0.02 0.02 0.025203 Central San Bernardino Valley0.07 0.06 0.05 0.05 0.040.05 0.06 0.04 0.05 0.07 0.06 0.05 0.03 0.14 0.02 0.01District Maximum 0.14 0.21 0.16 0.15 0.11 0.07 0.09 0.08 0.10 0.21 0.09 0.23 0.06 0.17 0.03 0.03* Less than 12 full months of data.** Salton Sea Air Basin*** Refer to 2003 AQMP for 1976 to 1989 data