2008 PM2.5 Plan 

Appendix A 

 

Ambient Air Quality Data and Analysis 
2008 PM2.5 Plan 

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San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-1 

Appendix A: Ambient Air Quality Data and Analysis 

A.1 INTRODUCTION 

This Appendix provides 2004-2006 PM2.5 data analysis, a description of the PM2.5 

attainment calculation process, 1999-2006 trends analysis, and ambient PM2.5 air 

quality data. This information supplements the overview of ambient PM2.5 data 

included in Chapter 1. 

A.2 OVERVIEW OF RESULTS: 2004-2006 ANNUAL AND 24-HOUR PM2.5 

AVERAGES 

Air quality meets the 24-hour PM2.5 standard when the 3-year average of the annual 

98th percentile PM2.5 value is less than or equal to 65 μg/m3 at each monitoring site. 

“Daily value” for PM refers to the 24-hour average concentration of PM calculated or 

measured from midnight to midnight (local standard time) for PM2.5. Average and 

mean refer to an arithmetic mean. All the San Joaquin Valley (SJV) air monitoring sites 

meet the 24 hour “1997” PM2.5 NAAQS (Table A-1). 

Air quality meets the annual PM2.5 standard whenever the 3-year average of the 

annual mean PM2.5 concentrations is less than or equal to 15.0 μg/m3

. Most of the 

SJVAPCD sites PM2.5 monitors are above the annual mean PM2.5 NAAQS (Table A2). 

See Section A.3 of this appendix for information on how these calculations are 

completed, and see Section A.4 for data analysis from 1999-2006. 

Table A-1 SJV PM2.5 98th Percentile Value, 2004-2006, (μg/m3)

SJV SITE 200420052006 AVG. 04-06 

Stockton 36.0 44.0 42.0 41 

Modesto 45.0 55.0 52.0 51 

Merced 43.0 48.3 43.8 45 

Fresno-1st 52.0 71.0 51.0 58 

Fresno-Winery 49.4 71.2 55.0 59 

Clovis 42.4 77.0 51.3 57 

Corcoran 49.4 74.5 50.1 58 

Visalia 54.0 65.0 50.0 56 

Bakersfield-Golden 53.8 74.9 64.4 64 

Bakersfield-California 63.1 63.6 60.5 62 

Bakersfield-Planz 78.6 66.4 50.6 65 

 Involves data substitution 

 98th percentile value affected by flagged data 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-2 

Table A-2 SJV PM2.5 Annual Mean Values, 2004-2006 

(μg/m3) 

SJV PM2.5 Annual Mean Value 

SJV SITE 2004 2005 2006 AVG. 04-06 

Stockton 13.2 12.5 13.1 12.9 

Modesto 13.6 13.9 14.8 14.1 

Merced 15.3 14.1 14.8 14.7 

Fresno-1st 16.4 16.9 16.8 16.7 

Fresno-Winery 17.0 16.9 17.6 17.2 

Clovis 15.8 16.0 16.8 16.2 

Corcoran 17.3 17.6 16.7 17.2 

Visalia 17.0 18.8 18.8 18.2 

Bakersfield-Golden 18.1 18.9 18.6 18.5 

Bakersfield-California 19.0 17.9 18.7 18.5 

Bakersfield-Planz 17.4 19.9 19.3 18.9 

A.3 PM2.5 ANNUAL AND 24-HOUR ATTAINMENT STATUS CALCULATIONS 

The San Joaquin Valley Unified Air Pollution Control District (District) calculated the 

Valley’s attainment status according to the requirements of the U. S. Environmental 

Protection Agency’s (EPA) April 1999 document, Guideline on Data Handling 

Conventions for the PM NAAQS, and Appendix N of 40 Code of Federal Regulations 

(CFR) part 50. PM2.5 values are calculated under both the annual and 24-hour NAAQS 

for each PM2.5 air quality-monitoring site that uses a federal reference method (FRM) 

monitor. There are 11 such air quality-monitoring sites1 in the eight-county Valley: at 

least one monitor in each county except Madera and three monitoring sites in both Kern 

and Fresno Counties due to their large population concentrations (in Bakersfield and 

Fresno/Clovis respectively). On March 21, 2007, District staff downloaded the data 

from EPA’s Air Quality System (AQS) website, the official repository for ambient air 

quality data (see Table 8 at the end of this Appendix). From this data, the District 

calculated the 2004 – 2006 daily and annual PM2.5 values accounting for the following: 

 Rounding conventions 

 Data completeness 

 Varying sampling schedules 

 Data validity flags 

 

1

 For more details on the San Joaquin Valley air monitoring sites, refer to San Joaquin Valley Air Pollution Control 

District Ambient Air Monitoring Network Plan, May 29, 2007, http://www.valleyair.org/notices/Docs/05-29-

07/AMNPlanComment.pdf. 

Annual average conisdered valid (Each Q>11 Samples and Annual Avg 

>Standard) but does not meet the 75% completeness requirement.
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-3 

A.3.1 Rounding Conventions 

The starting point for annual and 24-hour PM2.5 averages is the ambient air quality data 

collected from the EPA-approved monitoring network operated in the San Joaquin 

Valley. The recorded concentrations are entered with one decimal place, and any other 

decimal places are truncated, not rounded (so 18.29 becomes 18.2, not 18.3). As the 

calculations are carried out (as described throughout this appendix), all of the available 

decimal places are retained until the final result is determined. Then, final annual 

PM2.5 averages are rounded to the nearest 0.1 μg/m3

 (so 0.05 μg/m3 is rounded to 0.1 

μg/m3). Final 24-hour PM2.5 averages are rounded to the nearest 1 μg/m3 (so 0.5 

μg/m3

 is rounded to 1 μg/m3). 

A.3.2 Data Completeness 

The data completeness test is performed for each site prior to calculating the 98th

Percentile and Annual Mean PM2.5 values to ensure that each site has enough values 

to be compared to the NAAQS. A site meets the data completeness test when at least 

75% of the scheduled sampling days for each quarter have valid data. The data 

completeness requirements for calculating the PM2.5 Annual Mean differ from the 24-

Hour Daily PM2.5 Value. 

For the annual PM2.5 values, on a site-by-site basis, the annual mean for that year and 

site is valid if each quarter has at least 75% of the scheduled sample days. For annual 

average calculations, quarters with at least 11 samples but less than 75 percent data 

completeness are included in the computation if the resulting annual average is greater 

than the level of the NAAQS, even though that site does not have a valid data for the 

year. No data is substituted for missing data. This method allows for nonattainment 

determinations, but cannot be used to prove attainment. 

For the 98th percentile PM2.5 values, when less than 75% of the amount of valid data 

that should have been yielded from a quarter’s scheduled sampling days is available, 40 

CFR Part 50 Appendix N allows for estimation of missing values provided that the 

following requirements must be met: 

• First, the site must have valid data for at least 50% of the scheduled number of 

samples for each quarter for all three years. 

• The emissions and meteorology for the quarters to be substituted must be 

comparable to the emissions and meteorology for the quarters in question. 

Once the above criteria are met, two approaches can be used to fill in for missing 

scheduled sampling days: 

• Replace the missing data with collocated data from the same site and day, if 

such data is available. 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-4 

• When there is no data from the same site and the same day, replace the missing 

data with the maximum concentration recorded at the site during the same 

quarter over the three-year period in question. 

Table A-3 shows the data completeness of the PM2.5 values by quarter from 2004 

through 2006. Since the data for some sites were incomplete, Table A-4 shows the 

substitutions for the 2004 through 2006 dataset. 

Table A-3 Data Completeness by Quarter, 2004 – 2006, as Percentages 

2004 2005 2006 Site 

1 2 3 4 1 2 3 4 1 2 3 4 

Bakersfield- Planz Road 87.1 100.0 87.1 53.3 80.0 83.9 90.0 90.3 96.7 60.0 93.5 80.6

Bakersfield-California Ave 76.9 83.5 69.6 80.4 75.6 91.2 81.5 80.4 81.1 89.0 90.2 88.0

Clovis-N Villa Ave 93.5 100.0 100.0 100.0 100.0 100.0 100.0 71.0 100.0 100.0 93.3 93.5

Fresno-1st Street 92.3 94.5 91.3 83.7 88.9 84.6 96.7 98.9 98.9 95.6 94.6 91.3

Modesto-14th Street 100.0 100.0 100.0 100.0 100.0 96.8 100.0 100.0 100.0 100.0 100.0 100.0

Stockton-Hazelton Street 100.0 100.0 100.0 100.0 103.3 100.0 96.7 100.0 100.0 100.0 100.0 100.0

Visalia-N Church Street 100.0 100.0 77.4 106.7 86.7 103.2 96.7 96.8 100.0 93.3 96.8 100.0

Bakersfield-Golden State 90.3 93.3 100.0 100.0 100.0 100.0 93.3 96.8 100.0 100.0 93.3 100.0

Corcoran-Patterson Avenue 83.9 93.3 100.0 93.3 93.3 93.3 93.3 100.0 76.7 93.3 93.3 93.5

Fresno-Hamilton and Winery 93.5 100.0 100.0 100.0 100.0 100.0 86.7 100.0 100.0 100.0 80.0 100.0

Merced-2334 M Street 90.3 100.0 100.0 100.0 100.0 100.0 100.0 96.8 93.3 100.0 100.0 100.0

 

 Collected data is less than 75 % complete. 

Table A-4 Data Substitution for 98th Percentile Calculations, 2004-2006 

 

Air monitoring site Incomplete 

quarter 

Substituted 

value 

Substituted maximum 

value from 

How many times 

substituted 

Bakersfield - Planz 2nd Qtr. 2006 30.6 μg/m3 2nd Qtr. 2005 16 times 

Bakersfield - Planz 4th Qtr. 2004 78.6 μg/m3 4th Qtr. 2006 13 times 

Bakersfield - California 3rd Qtr. 2004 63.1 μg/m3 3rd Qtr. 2004 24 times 

Clovis - Villa 4th Qtr. 2005 77.0 μg/m3 4th Qtr. 2005 9 times 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-5 

A.3.3 Varying Sampling Schedules 

Table A-5 shows the sampling schedules for San Joaquin Valley air monitoring sites. 

For non-seasonal monitoring sites, with a “year round” schedule, the sampling cycle 

does not change during the year. For seasonal monitoring sites, a 1 in 3 day sampling 

cycle is used from October through March and a 1 in 6 day sampling cycle from April 

through October. This seasonal schedule ensures that more samples are taken during 

the times of year when PM2.5 tends to be the highest. 

Table A-5 Sampling schedules for SJV air monitoring sites, 2004-2006 

Air Monitoring Site Sampling Cycle Schedule 

Bakersfield- Planz 1 in 3 day year round 

Bakersfield - California Daily year round 

Fresno - 1st Daily year round 

Modesto - 14th 1 in 3 day year round 

Stockton - Hazelton 1 in 3 day year round 

Visalia - Church 1 in 3 day year round 

Merced - Mst 1 in 3, 1 in 6 day seasonal 

Fresno - Winery 1 in 3, 1 in 6 day seasonal 

Corcoran - Patterson 1 in 3, 1 in 6 day seasonal 

Bakersfield - Golden 1 in 3, 1 in 6 day seasonal 

Clovis - Villa 1 in 3, 1 in 6 day seasonal 

The 98th percentile is defined as the daily value out of a year of monitoring data below 

which 98 percent of all values in the group fall. The procedure for calculating the 3-year 

average 98th percentile value when the site has complete data is as follows: first, sort 

all data values collected in each year from lowest to highest. Then assign a rank to 

each data value. Assign rank 1 to the lowest 24-hour average in each year, rank 2 to 

the second lowest, and so forth. Next, multiply the number of samples taken in the year 

by 0.98. Take the integer part of the product and add 1. This gives the rank 

corresponding to the 98th percentile. Find the value that corresponds to the rank. 

Calculate the 3-year average of all three values for the 98th percentile. Round decimals 

0.5 or greater up and those less than 0.5 down. Compare the result to the standard of 

65 μg/m3

. 

The sample calculation for the 3-year average 98th percentile value for Bakersfield - 

Planz is as follows: First, apply the data completeness test on 2004, 2005, and 2006 

Bakersfield - Planz values. As mentioned in the previous paragraph, Bakersfield - 

Planz had incomplete data for 2006 2nd Quarter and 2004 4th Quarter. 2005 Bakersfield 

- Planz data was complete. The maximum value over three years for the same quarter 

was 78.6 μg/m3

, which occurred in 4th Quarter of 2006 (substituted 13 times). The 

maximum value over three years for the 2nd Quarter at Bakersfield - Planz was 30.6 

μg/m3

, which occurred in 2005 (substituted 16 times). After data substitution, sort all 

data values collected in a year from lowest to highest. 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-6 

Assign a rank for each data value. Rank 101, 100, 99 data points in 2006 were 78.6, 

64.7, 50.6 μg/m3, respectively. Next, calculate the rank of the 98th percentile for the 

year. Multiply, the number of samples taken in 2006 (101 samples) by 0.98, which 

equals 98.98. Then, take the integer part of the product and add 1. This gives the 

ranking that corresponds to the 98th percentile, which would be 99. Rank 99 

corresponds to 50.6 μg/m3

 value, which is the 2006 98th percentile value. In order to 

find the 3-year average 98th percentile value, take the 98th percentile values by year as 

shown in Table 1, 78.6 (2004), 66.4 (2005), and 50.6 (2006) add them and divide by 3. 

Round the answer to the nearest integer, which would be 65 μg/m3. Since this value is 

less than or equal to the PM2.5 NAAQS, Bakersfield - Planz is in attainment of the 24 

hour PM2.5 NAAQS. 

Calculating the 3-Year Average 98th Percentile for PM2.5 for seasonal sampling 

frequencies 

Five sites (Fresno - Winery, Clovis - Villa, Bakersfield - Golden, Corcoran - Patterson, 

and Merced - M Street) have seasonal sampling frequencies that change during the 

year, as shown in Table A-5. Special calculations were performed for these sites to 

take the seasonal sampling frequencies into account. 

The seasonal sampling calculation uses the following formula, where the smallest 

measured concentration, x, makes W(x) > .98:

( ) ( ) FLow(x), dhigh dlow

dlow FHigh x

dhigh dlow

dhigh W x dhigh

+

+

+ =

dhigh = number of calendar days in the “High” season, 

dlow = number of calendar days in the “Low” season, (dhigh +dlow = days in a year) 

number of samples in season a

number of samples in season a that are x Fa x≤ ( ) =

such that Fa(x) can be either High or Low, 

x is the measured concentration, and 

dhigh / (dhigh +dlow) and dlow / (dhigh +dlow) are constant and are called seasonal “weights”

Example: Bakersfield – Golden 98th percentile value, 2006 

The following example shows the procedures in determining the 2006 98th percentile 

value at Bakersfield - Golden, using the seasonal sampling calculation. The sampling 

cycle at Bakersfield - Golden is once every third day during the high months (October, 

November, December, January, February, and March) and once every six days during 

the low months (April, May, June, July, August, and September). Table A-6 is a 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-7 

simplified version of the above equation in spreadsheet form. The high season ranking 

is shown with associated concentration values. 

High season seasonal weight (SW) is calculated by taking the number of calendar days 

in the high season divided by the total number of calendar days in the year (182 days / 

365 days) = 0.499. 

FHigh is number of samples in season that are higher than the sample shown. For 

example, for the 61st rank concentration of 76.4 μg/m3

, FHigh is calculated by 61 

samples (number of samples in the high season that are less than then the smallest 

measured concentration) / 61 samples (number of samples in the season), which is 

equal to 1. 

Low season SW is calculated by taking the number of calendar days in the low season 

divided by the total number of calendar days in the year (183 days / 365 days) = 0.501. 

Since all of the high concentrations at Bakersfield-Golden for the calculated year 

occurred in the high season, FLow is 1. After using the following equation to calculate 

W(x): 

( ) ( ) FLow(x), dhigh dlow

dlow FHigh x

dhigh dlow

dhigh W x dhigh

+

+

+ =

where W(x) = 1 

The calculation is performed for the 57, 58, 59, and 60th ranked concentrations. The 

smallest value of x where W(x) is greater than 0.98 by moving up the right hand column 

until the first number greater than but not equal to 0.98 (0.983651) is identified. This 

value, which is the 98th percentile value, corresponds to the concentration of 64.4 μg/m3

for Bakersfield-Golden in 2006. 

Table A-6 Calculating Weighted Percentiles for Two Seasons, 

2006, Bakersfield Golden 

High Season Seasonal Weight (SW) 0.498630137 

Low Season Seasonal Weight (SW) 0.5013699 

 

Rank Concentration 

(μg/m3) FHigh FLow W(x) 

61 76.4 1 1 1

60 75.2 0.98360656 1 0.991826

59 64.4 0.96721311 1 0.983651

58 60.9 0.95081967 1 0.975477

57 58.7 0.93442623 1 

First W(x) > 0.98, 

starting from the 

lowest ranked, is 

the 98th percentile 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-8 

Calculating the PM2.5 Annual Mean Value 

The annual mean value is calculated by determining the four quarterly means for a site. 

First, add all the 24-hour average PM2.5 sample concentrations for each calendar 

quarter of a particular year; then divide by the number of samples. Then calculate the 

annual mean from the four quarterly means. Calculate the annual means for each of 

the other two years using the same approach above. Then calculate the 3-year 

average of the annual means. Round the number to the nearest tenth and compare to 

the NAAQS of 15.0 μg/m3

. 

The calculation for the PM2.5 annual mean value for Bakersfield - Planz in 2006 is as 

follows: First, apply the data completeness test on the 2006 Bakersfield - Planz 

measurements. As mentioned in the previous section on calculating the daily 98th

percentile value, Bakersfield - Planz had incomplete data for 2006 2nd Quarter. 

Appendix N states that years with high values that don’t meet the completeness test 

must still be used when the site has at least 11 samples in each quarter (minimum 

requirement is 11 samples per quarter for all sampling schedules). For Bakersfield - 

Planz the 2nd Quarter in 2006 had 18 samples. Next, average the samples for each 

quarter in 2006 and round the value to the nearest tenth, 19.3 μg/m3. These values 

also appear in Table A-7. Follow the same procedure above for calculating the 2004 

(17.4 μg/m3) and 2005 (19.9 μg/m3) annual mean values. Then average the 2004 

through 2006 annual mean values and round the value to the nearest tenth, 18.9 μg/m3. 

Then compare 18.9 μg/m3 to the PM2.5 annual mean NAAQS of 15.0 μg/m3

. 18.9 

μg/m3 is higher than the PM2.5 annual mean NAAQS and is non-attainment. Even 

though the 2nd Quarter 2006 had incomplete data at this site, the annual mean is still 

considered valid. No data substitution occurred to fill in for missing data to perform the 

annual mean PM2.5 calculation. 

Table A-7 Quarterly Averages, 2006 Bakersfield - Planz PM2.5 Values 

Quarter 

Average 

concentrations

(μg/m3) 

1st Quarter 18.17931 

2nd Quarter 12.12778 

3rd Quarter 19.5 

4th Quarter 27.588 

Annual Average 19.3 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-9 

A.3.4 Data Validity Flags 

Some of the measured values in the dataset were marked with a data validity flag. A 

data validity flag is used to mark data for specific reasons. The following procedures 

were considered when handling the data validity flags while performing the PM2.5 

calculations: 

1. All data points (values with no codes, capital and lower case validity flags) were 

used in determining completeness. 

2. Data associated with capital letter validity codes were not used in actual 

attainment calculations. 

3. Lower case and numeric “1” validity codes were used to determine completeness 

and calculate attainment values. 

4. The data with the numeric validity “5” code, meaning “outlier, cause unknown” 

was not used in the actual calculations but only to be counted toward 

completeness. 

The District downloaded the official PM2.5 24-hour averages from EPA on March 21, 

2007. On May 7, 2007, the District was informed by ARB that some invalid data 

collected from October 16, 2005 through November 6, 2005 (8 samples) from the Clovis 

air-monitoring site remained in the official EPA database. The District took action to 

remove this data, and the data is no longer in the database. These data were excluded 

in attainment calculations. Overall, there were 349 samples collected Valley-wide that 

had a data validity flag applied to the sample. The complete set of data including data 

with data validity flags for 2004-2006 is shown in Table A-13 at the end of this appendix. 

A.4 DATA ANALYSIS, 1999-2006 

 

As required by EPA, the PM2.5 monitoring was underway nation-wide beginning in 

1999. Table A-8 summarizes the PM2.5 98th percentile value for currently operating 

PM2.5 monitoring sites in the San Joaquin Valley Air Basin (SJVAB) for the years 1999-

2006. The calculation of the PM2.5 24-hour 98th percentile concentration is explained 

in Section A.3 of this Appendix. Table A-9 shows the 24-hour PM2.5 3-year average of 

the 98th percentile value for each site within the SJVAB for the years 1999-2006. A 

dash (-) indicates that there is insufficient (or no) data available to determine the value. 

Table A-10 summarizes the PM2.5 annual values for currently operating sites in the 

SJVAB for the years 1999-2006. The calculation of the annual PM2.5 concentration is 

also explained in Section A.3 of this Appendix. Table A-11 shows the PM2.5 3-year 

average annual mean values for each site within the SJVAB for the years 1999-2006. 

Current attainment status is determined for each site by analyzing PM2.5 

measurements2

 from 2004 through 2006. If any monitoring site within the SJVAB has 

 

2

 40 CFR (Code of Federal Regulations) Part 50, Appendix N require that attainment calculations be based on at 

least the most recent three complete years of quality reviewed data. 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-10 

both a 3-year average 98th percentile 24-hour PM2.5 design value that is greater than 

65 μg/m3 and a 3-year annual mean PM2.5 design value that is greater than 15.0 

μg/m3, then the entire air basin is designated nonattainment3. Table A-12 summarizes 

the current attainment status on a site-by-site basis. Bold values indicate values over 

the National Ambient Air Quality Standard (NAAQS). Table A-12 shows that three of 

the 11 air monitoring sites (Stockton, Modesto, and Merced) in the SJVAB currently 

meet the attainment test for PM2.5. Eight out of 11 sites are nonattainment for the 

PM2.5 standard for the 2004-2006 time period, and three of the sites attain the PM2.5 

NAAQS. This is an improvement from the 1999-2001 period, when all sites were 

nonattainment4

. 

Figures A-1 through A-11 show the 3-year average 98th percentile 24-hour average 

PM2.5 concentrations for each San Joaquin Valley air monitoring site. Figures A-12 

through A-22 show the 3-year annual mean design values for 1999-2006. The years 

stated on the x-axis in Figures A-1 through A-22 represent the end year of the 3-year 

averaging period. Figure A-23 and Figure A-24 illustrates the San Joaquin Valley air 

basin map as a bubble chart with 3-year average 98th percentile 24 hour average from 

the year 2002 and 2006, respectively. Figure A-25 and Figure A-26 shows the San 

Joaquin Valley air basin map as a bubble chart with 3-year annual mean PM2.5 design 

values depicted on a site-by-site basis from the year 2002 and 2006, respectively. 

Figures A-23 and A-24 depict an improvement of the PM2.5 air quality from 2002 to 

2006. More air quality trend data can be found at <http://www.arb.ca.gov>. 

A.5 TREND AND SPATIAL VARIATIONS 

A.5.1 Local Trends 

While the peak San Joaquin Valley design value site trend (Bakersfield - Planz) remains 

essentially unchanged, a majority of the sites are improving. Ten of the 11 air 

monitoring sites in the SJVAB are showing an improving air quality trend: Stockton, 

Modesto, Merced, Fresno-1st, Fresno-Winery, Clovis, Corcoran, Visalia, BakersfieldCalifornia, and Bakersfield-Golden. Tables A-8 through A-11 show PM2.5 averages 

from 1999-2006. Table A-12 shows the attainment status for each SJV site based on 

2004-2006 data. Figures A-2 through A-22 show improving trends. The degree of the 

improvement of the trend varies from essentially unchanged at Bakersfield-Planz 

(Figure A-3) to downward at Visalia -Church (Figure A-15). 

 

3

 Under the 1997 PM2.5 standard, the standard upon which this plan is based. 4

 Please note that Fresno-1st had incomplete data for 2001 for the annual mean calculation. However, based on the 

years before and after, the annual mean value would have been above the NAAQS in 2001. 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-11 

Table A-8 24-hour PM2.5 98th percentile values (μg/m3), 1999-2006 

 Site 1999 2000 2001 2002 2003 2004 2005 2006 

Stockton 79.0 55.0 58.0 50.0 41.0 36.0 44.0 42.0 

Modesto 95.0 71.0 64.0 64.0 47.0 45.0 55.0 52.0 

Merced ** 80.3 ** 55.1 44.2 43.0 48.3 43.8 

Fresno-1st 119.0 89.0 67.0 75.0 55.0 52.0 71.0 51.0 

Fresno-Winery * 64.8 61.5 71.9 49.7 49.4 71.2 55.0 

Clovis 59.2 72.5 71.5 53.2 ** 42.4 77.0 51.3 

Corcoran   89.5 65.1 42.2 49.4 74.5 50.1 

Visalia 114.0 103.0 96.0 53.0 47.0 54.0 65.0 50.0 

Bakersfield-Golden 95.3 85.6 86.1 80.4 51.9 53.8 74.9 64.4 

Bakersfield-California **  88.8 94.9 66.8 85.7 63.1 63.6 60.5 

Bakersfield-Planz * ** 90.6 66.8 47.5 78.6 66.4 50.6 

* Monitor not in operation. 

 

** 

Does not meet the requirement for the 50% of the observations in each 

quarter. Can't calculate the 98th percentile through substitution. 

 Derived value via data substitution. 

 Valid data, but does not meet the 75% data completeness test. 

 98th percentile value changed due to flagged data. 

Table A-9 3-year average of the 24-hour PM2.5 98th percentile values (μg / m3

) 

Site 

1999-

2001 

2000-

2002 

2001-

2003 

2002-

2004 

2003-

2005 

2004-

2006 

Stockton 64 54 50 42 40 41 

Modesto 77 66 58 52 49 51 

Merced - - - 47 45 45 

Fresno-1st - - 66 61 59 58 

Fresno-Winery - 66 61 57 57 59 

Clovis 68 66 - - - 57 

Corcoran - - 66 52 55 58 

Visalia 104 84 65 51 55 56 

Bakersfield-Golden 89 84 73 62 60 64 

Bakersfield-California - 84 82 72 71 62 

Bakersfield-Planz - - 68 64 64 65 

 Valid but does not meet the 75% data completeness test. 

- 

A dash indicates that there is insufficient data available 

to determine the average value. 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-12 

Table A-10 Annual mean PM2.5 value concentrations (μg/m3) 

 Site 1999 2000 2001 2002 2003 2004 2005 2006 

Stockton 19.8 16.8 13.8 16.7 13.4 13.2 12.5 13.1 

Modesto 24.4 18.7 17.0 18.4 14.5 13.6 13.9 14.8 

Merced 16.7 16.6 18.7 15.5 15.3 14.1 14.8 

Fresno-1st 26.9 19.1 21.0 17.6 16.4 16.9 16.8 

Fresno-Winery 18.6 18.7 21.4 17.8 17.0 16.9 17.6 

Clovis 19.8 16.3 18.2 16.2 15.8 16.0 16.8 

Corcoran 16.2 19.2 21.5 16.2 17.3 17.6 16.7 

Visalia 27.6 23.7 22.5 19.4 18.2 17.0 18.8 18.8 

Bakersfield-Golden 26.2 21.7 19.8 24.2 19.6 18.1 18.9 18.6 

Bakersfield-California 22.5 22.1 21.7 23.4 16.9 19.0 17.9 18.7 

Bakersfield-Planz 20.3 23.9 23.7 17.8 17.4 19.9 19.3 

 

 

Annual average considered valid (each quarter has 

more than 11 samples), but does not meet the 75% 

completeness requirement. 

 

Does not meet the requirement for 50% of the 

observations in a quarter. 

Table A-11 3-year average of the annual mean PM2.5 values (μg/m3) 

Site 

1999 - 

2001 

2000-

2002 

2001-

2003 

2002-

2004 

2003-

2005 

2004-

2006 

Stockton 16.8 15.8 14.6 14.4 13.0 12.9 

Modesto 20.0 18.0 16.6 15.5 14.0 14.1 

Merced - 17.3 16.9 16.5 15.0 14.7 

Fresno-1st - - 19.3 18.3 17.0 16.7 

Fresno-Winery - 19.6 19.3 18.7 17.2 17.2 

Clovis 18.1 16.9 - - - 16.2 

Corcoran - 19.0 19.0 18.3 17.0 17.2 

Visalia 24.6 21.9 20.1 18.2 18.0 18.2 

Bakersfield-Golden 22.6 21.9 21.2 20.6 18.9 18.5 

Bakersfield-California 22.1 22.4 20.7 19.8 17.9 18.5 

Bakersfield-Planz - 22.6 21.8 19.6 18.4 18.9 

 

 

Annual average considered valid (each quarter has more than 11 

samples), but does not meet the 75% completeness requirement. 

- 

A dash indicates that there is insufficient data available to 

determine the value. 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-13 

Table A-12 Current (2004 – 2006) PM2.5 air quality design values and attainment 

status for the San Joaquin Valley Air Basin 

Attainment Tests 

 

Monitoring Station 

Three -Year Average 

98th Percentile 24 hr. 

(μg / m3)* 

Three - Year Annual 

Average (μg / m3) 

 Attainment 

Status**

Stockton 41 12.9 Yes 

Modesto 51 14.1 Yes 

Merced 45 14.7 Yes 

Fresno-1st 58 16.7 No 

Fresno-Winery 59 17.2 No 

Clovis 57 16.2 No 

Corcoran 58 17.2 No 

Visalia 56 18.2 No 

Bakersfield-Golden 64 18.5 No 

Bakersfield-California 62 18.5 No 

Bakersfield-Planz 65 18.9 No 

* First, average the 4 quarterly values for each of three years, then next average those 

three values to obtain the three-year average. 

** A station is considered in attainment if the three- year average 98th percentile 24-hour 

PM2.5 concentration is less than or equal to 65 μg / m3 and the three year average annual 

PM2.5 concentration is less than or equal to 15.0 μg / m3

. 

Bold is considered nonattainment.
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-14 

Figure A-1 Bakersfield - Planz 3-year average 98th percentile 24-hour average 

PM2.5 concentrations from 2001 (1999-2001 average) to 2006 (2004-2006 average) 

0

20

40

60

80

100

120

2001 2002 2003 2004 2005 2006

3 - Year Average PM2.5 98th Percentile Value (μg / m3 )

PM2.5 NAAQS of 65 μg / m3 

Figure A-2 Bakersfield - California 3-year average 98th percentile 24-hour average 

PM2.5 concentrations from 2001 (1999-2001 average) to 2006 (2004-2006 average) 

0

20

40

60

80

100

120

2001 2002 2003 2004 2005 2006

3 - Year Average PM2.5 98th Percentile Value (μg / m3 )

PM2.5 NAAQS of 65 μg / m3 

micrograms / m3
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-15 

Figure A-3 Bakersfield - Golden 3-year average 98th percentile 24-hour average 

PM2.5 concentrations from 2001 (1999-2001 average) to 2006 (2004-2006 average) 

0

20

40

60

80

100

120

2001 2002 2003 2004 2005 2006

3 - Year Average PM 2.5 98th Percentile Value (μg / m 3 )

PM2.5 NAAQS of 65 μg / m3 

Figure A-4 Visalia 3-year average 98th percentile 24-hour average PM2.5 

concentrations from 2001 (1999-2001 average) to 2006 (2004-2006 average) 

0

20

40

60

80

100

120 3 - Year Average PM

2001 2002 2003 2004 2005 2006

2.5 98th Percentile Value (

μg / m3 )

PM2.5 NAAQS of 65 μg / m3 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-16 

Figure A-5 Corcoran 3-year average 98th percentile 24-hour average PM2.5 

concentrations from 2001 (1999-2001 average) to 2006 (2004-2006 average) 

0

20

40

60

80

100

120

2001 2002 2003 2004 2005 2006

3 - Year Average PM2.5 98th Percentile Value (μg / m3 )

PM2.5 NAAQS of 65 μg / m3 

Figure A-6 Fresno-Winery 3-year average 98th percentile 24-hour average PM2.5 

concentrations from 2001 (1999-2001 average) to 2006 (2004-2006 average) 

0

20

40

60

80

100

120

2001 2002 2003 2004 2005 2006

3 - Year Average PM2.5 98th Percentile Value (μg / m3 )

PM2.5 NAAQS of 65 μg / m3 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-17 

Figure A-7 Fresno-1st 3-year average 98th percentile 24-hour average PM2.5 

concentrations from 2001 (1999-2001 average) to 2006 (2004-2006 average) 

0

20

40

60

80

100

120

2001 2002 2003 2004 2005 2006

3 - Year Average PM 2.5 98th Percentile Value (μg / m 3 )

PM2.5 NAAQS of 65 μg / m3 

Figure A-8 Clovis 3-year average 98th Percentile 24-hour average PM2.5 

concentrations 

0

20

40

60

80

100

120

2001 2002 2003 2004 2005 2006

3 - Year Average PM2.5 98th Percentile Value (μg / m3 )

PM2.5 NAAQS of 65 μg / m3 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-18 

Figure A-9 Merced - M Street 3-year average 98th percentile 24-hour average 

PM2.5 concentrations from 1999 to 2006 

0

20

40

60

80

100

120

2001 2002 2003 2004 2005 2006

3 - Year Average PM 2.5 98th Percentile Value (μg / m 3 )

PM2.5 NAAQS of 65 μg / m3 

Figure A-10 Modesto 3-year average 98th percentile 24-hour average PM2.5 

concentrations from 1999 to 2006 

0

20

40

60

80

100

120

2001 2002 2003 2004 2005 2006

3 - Year Average PM 2.5 98th Percentile Value (μg / m 3 )

PM2.5 NAAQS of 65 μg / m3 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-19 

Figure A-11 Stockton 3-year average 98th percentile 24-hour average PM2.5 

concentrations from 1999 to 2006 

0

20

40

60

80

100

120

2001 2002 2003 2004 2005 2006

3 - Year Average PM2.5 98th Percentile Value (μg / m3 )

PM2.5 NAAQS of 65 μg / m3 

Figure A-12 Bakersfield - Planz 3-year average PM2.5 annual mean value from 

1999 to 2006 

10.0

12.0

14.0

16.0

18.0

20.0

22.0

24.0

26.0

2001 2002 2003 2004 2005 2006

3 - Year Average Annual Mean Value (μg / m 3

)

PM2.5 NAAQS of 15.0 μg / m3 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-20 

Figure A-13 Bakersfield - California 3-year average PM2.5 annual mean value from 

1999 to 2006 

10.0

12.0

14.0

16.0

18.0

20.0

22.0

24.0

26.0

2001 2002 2003 2004 2005 2006

3 - Year Average Annual Mean Value (μg / m 3

)

PM2.5 NAAQS of 15.0 μg / m3 

Figure A-14 Bakersfield - Golden 3-year average PM2.5 annual mean value from 

1999 to 2006 

10.0

12.0

14.0

16.0

18.0

20.0

22.0

24.0

26.0

2001 2002 2003 2004 2005 2006

3 - Year Average Annual Mean Value (μg / m3

)

PM2.5 NAAQS of 15.0 μg / m3 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-21 

Figure A-15 Visalia 3-year average PM2.5 annual mean value from 1999 to 2006 

10.0

12.0

14.0

16.0

18.0

20.0

22.0

24.0

26.0

2001 2002 2003 2004 2005 2006

3 - Year Average Annual Mean Value (μg / m3

)

PM2.5 NAAQS of 15.0 μg / m3 

Figure A-16 Corcoran 3-year average PM2.5 annual mean value from 1999 to 2006 

10.0

12.0

14.0

16.0

18.0

20.0

22.0

24.0

26.0

2001 2002 2003 2004 2005 2006

3 - Year Average Annual Mean Value (μg / m 3

)

PM2.5 NAAQS of 15.0 μg / m3 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-22 

Figure A-17 Fresno-Winery 3-year average PM2.5 annual mean value from 1999 to 

2006 

10.0

12.0

14.0

16.0

18.0

20.0

22.0

24.0

26.0

2001 2002 2003 2004 2005 2006

3 - Year Average Annual Mean Value (μg / m 3

)

PM2.5 NAAQS of 15.0 μg / m3 

Figure A-18 Fresno-1st 3-year average PM2.5 annual mean value from 1999 to 2006 

10.0

12.0

14.0

16.0

18.0

20.0

22.0

24.0

26.0

2001 2002 2003 2004 2005 2006

3 - Year Average Annual Mean Value (μg / m 3 )

PM2.5 NAAQS of 15.0 μg / m3 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-23 

Figure A-19 Clovis 3-year average PM2.5 annual mean value from 1999 to 2006 

10.0

12.0

14.0

16.0

18.0

20.0

22.0

24.0

26.0

2001 2002 2003 2004 2005 2006

3 - Year Average Annual Mean Value (μg / m3

)

PM2.5 NAAQS of 15.0 μg / m3 

Figure A-20 Merced M Street 3-year average PM2.5 annual mean value from 

1999 to 2006 

10.0

12.0

14.0

16.0

18.0

20.0

22.0

24.0

26.0

2001 2002 2003 2004 2005 2006

3 - Year Average Annual Mean Value (μg / m3

)

PM2.5 NAAQS of 15.0 μg / m3 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-24 

Figure A-21 Modesto - 14th 3-year average PM2.5 annual mean value from 

1999 to 2006 

10.0

12.0

14.0

16.0

18.0

20.0

22.0

24.0

26.0

2001 2002 2003 2004 2005 2006

3 - Year Average Annual Mean Value (μg / m 3 )

PM2.5 NAAQS of 15.0 μg / m3 

Figure A-22 Stockton - Hazelton 3-year average PM2.5 annual mean value from 

1999 to 2006 

10.0

12.0

14.0

16.0

18.0

20.0

22.0

24.0

26.0

2001 2002 2003 2004 2005 2006

3 - Year Average Annual Mean Value (μg / m3 )

PM2.5 NAAQS of 15.0 μg / m3 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-25 

Figure A-23 PM2.5 24-hour Design Value Comparison, 2002 and 2006 

 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-26 

Figure A-24 PM2.5 Annual Mean Design Value Comparison, 2002 and 2006 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-27 

A.6 RESULTS USING PRELIMINARY 2007 REAL-TIME 24-HOUR PM2.5 DATA 

The District used real-time non-Federal Reference Method BAM data to calculate 

preliminary 2007 24-hour PM2.5 98th percentile values and the three-year (2005 through 

2007) 24-hour average 98th percentile values. The data used in this calculation is 

preliminary and is subject to change. 

Air quality meets the 24-hour PM2.5 standard when the average of the annual 

98th percentile PM2.5 value is less than or equal to 65 μg/m3 at each monitoring site. 

“Daily value” for PM refers to the 24-hour average concentration of PM calculated or 

measured from midnight to midnight local standard time for PM2.5. Average and 

mean refer to an arithmetic mean. The data completeness test is performed for each 

site prior to calculating the 98th Percentile and Annual Mean PM2.5 values to ensure 

that each site has enough values to be compared to the NAAQS. A site meets the data 

completeness test when at least 75% of the scheduled sampling days for each quarter 

have valid data. All sites in 2007 meet data completeness requirements using real-time 

non-Federal Reference Method BAM data. 

According to the preliminary real-time 2007 non-Federal Reference Method BAM data, 

all San Joaquin Valley (SJV) air monitoring sites meet the 24 hour “1997” PM2.5 

NAAQS (Table A-13) except Clovis, Bakersfield-Golden, and Bakersfield-California. 

Once the official 2007 Federal Reference Method PM2.5 data is available, typically no 

earlier than July 1st, 2008, the District will perform the necessary 24-hour and annual 

PM2.5 attainment calculations and determine the designation status. 

Table A-13 24 - hour PM2.5 98th percentile values (μg / m3). 

2007 data is considered preliminary. 

SJV SITE 2005 2006 2007* AVG. 05-07

Stockton 44.0 42.0 50.0 45

Tracy § § 39.0 §

Modesto 55.0 52.0 64.0 57

Turlock § § 58.0 §

Merced 48.3 43.8 # #

Fresno-1st 71.0 51.0 70.0 64

Fresno-Winery 71.2 55.0 # #

Clovis 77.0 51.3 72.0 67

Corcoran 74.5 50.1 67.0 64

Visalia 65.0 50.0 67.0 61

Bakersfield-Golden 74.9 64.4 74.0 71

Bakersfield-California 63.6 60.5 77.0 67

Bakersfield-Planz 66.4 50.6 # #

Derived value via data substitution.

* - 2007 PM2.5 data is from a BAM which is considered preliminary and subject to change.

§ - Federal Reference Method monitors are not located at these sites.

# - Real time data is not available.
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-28 

Table 14 Complete Air Quality Data, 2004-2006 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-29 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-30 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-31 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-32 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-33 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-34 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-35 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-36 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-37 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-38 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-39 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-40 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-41 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-42 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-43 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-44 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-45 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-46 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-47 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-48 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-49 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-50 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-51 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-52 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-53 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-54 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-55 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-56 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-57 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-58 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-59 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-60 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-61 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-62 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-63 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-64 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-65 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-66 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-67 
San Joaquin Valley Unified Air Pollution Control District April 30, 2008

Appendix A: Ambient Air Quality Data and Analysis 

2008 PM2.5 Plan 

Appendix A-68