Washoe County, Nevada 

Air Quality Trends (2001-2010) 

May 2011 

Toll Road Monitoring Station

Prepared by 

Lauri Mendoza and Daniel Inouye 

Washoe County Health District 

Air Quality Management Division 

P.O. Box 11130 

Reno, Nevada 89520-0027 

(775) 784-7200 

www.washoecounty.us/health 
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Table of Contents

Page 

INTRODUCTION ..........................................................................................................................1 

POLLUTANTS ..............................................................................................................................2 

 Particulate Matter (PM10 and PM2.5) ........................................................................................2 

 Ozone (O3) ..............................................................................................................................2 

 Carbon Monoxide (CO)...........................................................................................................3 

 Nitrogen Dioxide (NO2) ...........................................................................................................3 

 Sulfur Dioxide (SO2)................................................................................................................4 

 Lead (Pb) ................................................................................................................................5 

NATIONAL AMBIENT AIR QUALITY STANDARDS ....................................................................6 

AMBIENT AIR MONITORING NETWORK ...................................................................................7 

 Currently Operating.................................................................................................................8 

 Reno3 (RNO) - (EPA ID #32-031-0016 SLAMS) ..............................................................8 

 South Reno (SRN) - (EPA ID #32-031-0020 SLAMS) ......................................................8 

 Galletti (GAL) - (EPA ID #32-031-0022 SLAMS)...............................................................8 

 Toll Road (TOL) - (EPA ID # 32-031-0025 SLAMS)..........................................................8 

 Plumb-Kit (PLM) - (EPA ID # 32-031-0030 SLAMS).........................................................8 

 Sparks (SPK) - (EPA ID #32-031-1005 SLAMS)...............................................................8 

 Incline Village (INC) - (EPA ID #32-031-2002 SLAMS).....................................................9 

 Lemmon Valley (LEM) - (EPA ID #32-031-2009 SLAMS).................................................9 

 No Longer Operating...............................................................................................................9 

 Reno (RNO) - (EPA ID #32-031-0016 SLAMS/SPMS) .....................................................9 

 Sun Valley (SUN) - (EPA ID #32-031-2006 SLAMS) ........................................................9 

 Mustang (MST) - (SPMS)..................................................................................................9 

A REVIEW of 2010 .....................................................................................................................10 

CURRENT DESIGN VALUES and ATTAINMENT STATUS ......................................................14 

TEN-YEAR AIR QUALITY TREND .............................................................................................15 

 PM10 (24-hour) ......................................................................................................................16 

 PM2.5 (24-hour)......................................................................................................................17 

 PM2.5 (Annual).......................................................................................................................18 

 O3 (8-hour) ............................................................................................................................19 

 CO (8-hour)...........................................................................................................................20 

 CO (1-hour)...........................................................................................................................21 

 NO2 (1-hour)..........................................................................................................................22 

 NO2 (Annual).........................................................................................................................23 

 SO2 (1-hour, 24-hour, and Annual) .......................................................................................24 

Tables .......................................................................................................................................... ii 

Figures.......................................................................................................................................... ii 

Appendices ................................................................................................................................... ii 

Acronyms and Abbreviations ........................................................................................................iii 

i 
Tables 

Page 

1. National Ambient Air Quality Standards (as of December 31, 2010)......................................6 

2. 2010 Exceedances Summary ...............................................................................................10 

3. Design Values and Attainment Status (as of December 31, 2010).......................................14 

Figures 

1. State of Nevada ......................................................................................................................1 

2. Washoe County Ambient Air Monitoring Sites (2001-2010)....................................................7 

3. Reno3......................................................................................................................................8 

4. Toll Road.................................................................................................................................8 

5. Lemmon Valley .......................................................................................................................9 

6. Monthly AQI Summary for All Pollutants (2010)....................................................................11 

7. Monthly AQI Summary of PM10 (2010)..................................................................................12 

8. Monthly AQI Summary of PM2.5 (2010).................................................................................12 

9. Monthly AQI Summary of O3 (2010) .....................................................................................13 

10. Monthly AQI Summary of CO (2010) ....................................................................................13 

11. AQI Trend (2001-2010).........................................................................................................15 

12. 24-hour PM10 Concentrations (1st Highs) ..............................................................................16 

13. 24-hour PM2.5 Concentrations (3-year Average of 98th Percentiles; 1st Highs; and 98th

Percentiles) ...........................................................................................................................17 

14. Annual PM2.5 Concentrations and Design Values.................................................................18 

15. 8-hour O3 Concentrations (3-year Average of 98th Percentiles)............................................19 

16. 8-hour CO Concentrations (2nd Highs) ..................................................................................20 

17. 1-hour CO Concentrations (2nd Highs)..................................................................................21 

18. 1-hour NO2 Concentrations (1st Highs, 98th Percentiles, and 3-Year Average of 98th

Percentiles) ...........................................................................................................................22 

19. Annual NO2 Concentrations..................................................................................................23 

20. SO2 Concentrations ..............................................................................................................24

Appendices 

A. Detailed Summary of Three Most Recent Years of Data 

ii 
iii 

Acronyms and Abbreviations 

AQI Air Quality Index 

AQMD Washoe County Health District - Air Quality Management Division 

AQS Air Quality System 

BAM Beta Attenuation Monitor 

CARB California Air Resources Board 

CASAC Clean Air Scientific Advisory Committee 

CFR Code of Federal Regulations 

CO Carbon Monoxide 

DMV Department of Motor Vehicles 

EPA U.S. Environmental Protection Agency 

FEM Federal Equivalent Method 

FRM Federal Reference Method 

GAL Galletti 

HA 87 Hydrographic Area 87 

INC Incline 

LEM Lemmon Valley 

MSA Metropolitan Statistical Area 

MST Mustang 

NAAQS National Ambient Air Quality Standards 

NAMS National Air Monitoring Station 

NCDC National Climate Data Center 

NCore National Core multipollutant monitoring station 

NDEP Nevada Division of Environmental Protection 

NDOT Nevada Department of Transportation 

NO2 Nitrogen Dioxide 

NOy Reactive Oxides of Nitrogen 

O3 Ozone 

PAMS Photochemical Assessment Monitoring Station 

PLM Plumb-Kit 

PM2.5 Particulate Matter less than or equal to 2.5 microns in aerodynamic diameter 

PM10 Particulate Matter less than or equal to 10 microns in aerodynamic diameter 

PMcoarse PM10 minus PM2.5

ppb parts per billion 

ppm parts per million 

RNO Reno 

RTIA Reno-Tahoe International Airport 

SIP State Implementation Plan 

SLAMS State and Local Air Monitoring Station 

SO2 Sulfur Dioxide 

SPK Sparks 

SPM Special Purpose Monitoring 

SRN South Reno 

STN Speciation Trends Network 

SUN Sun Valley 

TOL Toll 

USG Unhealthy for Sensitive Groups 
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INTRODUCTION 

Washoe County is located in the northwest portion of Nevada and is bounded by California, 

Oregon, and the Nevada counties of Humboldt, Pershing, Storey, Churchill, Lyon, and Carson 

City (Figure 1). The majority of Washoe County’s population is concentrated in the southern 

portion of the county, especially in the Truckee Meadows. The Truckee Meadows is 

approximately 200 square miles in size and identified as Hydrographic Area 87 (HA 87) as 

defined by the State of Nevada Division of Water Resources. 

The U.S. Environmental Protection Agency (EPA) has set health 

and welfare based National Ambient Air Quality Standards 

(NAAQS) for the following pollutants: particulate matter less than or 

equal to 10 microns (PM10), particulate matter less than or equal to 

2.5 microns (PM2.5), ozone (O3), carbon monoxide (CO), nitrogen 

dioxide (NO2), sulfur dioxide (SO2), and lead (Pb). The mission of 

the Washoe County Health District - Air Quality Management 

Division (AQMD) Monitoring Program is “To monitor and assure the 

scientific accuracy of the ambient air quality data collected for the 

determination of compliance with the National Ambient Air Quality 

Standards (NAAQS) as defined by the EPA”. The AQMD has 

established a monitoring network throughout the Health District to 

collect ambient air data. The network is reviewed annually to 

ensure it reflects the actual air quality of the county and that it is 

measuring for the pollutants of highest concern. 

This document summarizes the ambient air data collected between 

2001 and 2010 from the AQMD’s monitoring network. These data were submitted to the EPA’s 

Air Quality System (AQS), and are available for public review on EPA’s AIRDATA website. 

Long-term monitoring data can reveal trends in ambient air pollution and the subsequent need 

for control measures. 

Figure 1 

State of Nevada

Washoe County, Nevada May 2011 

Air Quality Trends (2001-2010) 1 
POLLUTANTS 

The following describes the six criteria pollutants, their primary sources, and associated health 

effects. 

Particulate Matter (PM10 and PM2.5)

Particulate matter, also known as particle pollution or PM, is a complex mixture of extremely 

small particles and liquid droplets. Particle pollution is made up of a number of components, 

including acids (such as nitrates and sulfates), organic chemicals, metals, and soil or dust 

particles. 

The size of particles is directly linked to their potential for causing health problems. Of concern 

are particles that are 10 micrometers in diameter or smaller because those are the particles that 

generally pass through the throat and nose and enter the lungs. Once inhaled, these particles 

can affect the heart and lungs and cause serious health effects. EPA groups particle pollution 

into two categories: 

 "Inhalable coarse particles”, such as those found near roadways and dusty industries, 

are between 2.5 and 10 micrometers in diameter. 

 “Fine particles”, such as those found in smoke and haze, are 2.5 micrometers in 

diameter and smaller. These particles can be directly emitted from sources such as 

forest fires, or they can form when gases emitted from power plants, industries, and 

automobiles react in the air. 

Particle pollution, especially fine particles, contains microscopic solids or liquid droplets that are 

so small that they can get deep into the lungs and cause serious health problems. Numerous 

scientific studies have linked particle pollution exposure to a variety of problems, including: 

increased respiratory symptoms, such as irritation of the airways, coughing, or difficulty 

breathing, for example; decreased lung function; aggravated asthma; development of chronic 

bronchitis; irregular heartbeat; nonfatal heart attacks; and premature death in people with heart 

or lung disease. 

People with heart or lung diseases, children and older adults are the most likely to be affected 

by particle pollution exposure. However, even healthy people may experience temporary 

symptoms from exposure to elevated levels of particle pollution. 

Ozone (O3)

Ozone is a gas composed of three oxygen atoms. It is not usually emitted directly into the air, 

but at ground-level is created by a chemical reaction between oxides of nitrogen (NOx) and 

volatile organic compounds (VOC) in the presence of sunlight. Ozone has the same chemical 

structure whether it occurs miles above the earth or at ground-level and can be “good” or “bad”, 

depending on its location in the atmosphere. “Good” ozone occurs naturally in the stratosphere 

approximately 10 to 30 miles above the earth and forms a layer that protects life on earth from 

the sun’s harmful rays. 

In the lower atmosphere, ground-level ozone is considered “bad”. Breathing ground-level ozone 

can trigger a variety of health problems including chest pain, coughing, throat irritation, and 

congestion. It can worsen bronchitis, emphysema, and asthma. Ground-level ozone also can 

reduce lung function and inflame the linings of the lungs. Repeated exposure may permanently 

scar lung tissue. People with lung disease, children, older adults, and physically active people 

may be affected when ozone levels are unhealthy. Numerous scientific studies have linked 

ground-level ozone exposure to a variety of problems including: airway irritation, coughing, and 

Washoe County, Nevada May 2011 

Air Quality Trends (2001-2010) 2 
pain when taking a deep breath; wheezing and breathing difficulties during exercise or outdoor 

activities; inflammation, which is much like a sunburn on the skin; aggravation of asthma and 

increased susceptibility to respiratory illnesses like pneumonia and bronchitis; and permanent 

lung damage with repeated exposures. 

Motor vehicle exhaust and industrial emissions, gasoline vapors, and chemical solvents as well 

as natural sources emit NOx and VOC that help form ozone. Ground-level ozone is the primary 

constituent of smog. Sunlight and hot weather cause ground-level ozone to form in harmful 

concentrations. As a result, it is known as a summertime air pollutant. Many urban areas tend 

to have high levels of “bad” ozone, but even rural areas are also subject to increased ozone 

levels because wind carries ozone and pollutants that form it hundreds of miles away from their 

original sources. 

Carbon Monoxide (CO)

Carbon monoxide is a colorless, odorless gas that is formed when carbon in fuel is not burned 

completely. It is a component of motor vehicle exhaust, which contributes about 56 percent of 

all CO emissions nationwide. Other non-road engines and vehicles (such as construction 

equipment and boats) contribute about 22 percent of CO emissions nationwide. Higher 

concentrations generally occur in areas with heavy traffic congestion. In cities, 85 to 95 percent 

of CO emissions may come from motor vehicle exhaust. Other sources include industrial 

processes (i.e., metals processing and chemical manufacturing), residential wood burning, and 

natural sources such as forest fires. The highest ambient levels of CO typically occur during the 

colder months of the year when temperature inversions are more frequent. The air pollution 

becomes trapped near the ground beneath a layer of warm air. 

Carbon monoxide can cause harmful health effects by reducing oxygen delivery to the body’s 

organs (i.e., heart and brain) and tissues. The health threat from lower levels of CO is most 

serious for those who suffer from heart disease, like angina, clogged arteries, or congestive 

heart failure. For a person with heart disease, a single exposure to low levels of CO may cause 

chest pain and a reduced ability to exercise. Repeated exposures may contribute to other 

cardiovascular effects. Even healthy people can be affected by high levels of CO. Exposure to 

high levels can result in vision problems, reduced ability to work or learn, reduced manual 

dexterity, and difficulty performing complex tasks. At extremely high levels, CO is poisonous 

and can cause death. 

Nitrogen Dioxide (NO2)

Nitrogen dioxide is one of a group of highly reactive gasses known as “oxides of nitrogen”, or 

“nitrogen oxides (NOx)”. Other nitrogen oxides include nitrous acid and nitric acid. While EPA’s 

NAAQS covers this entire group of NOx, NO2 is the component of greatest interest and the 

indicator for the larger group of NOx. NO2 forms quickly from emissions from cars, trucks and 

buses, power plants, and off-road equipment. In addition to contributing to the formation of 

ground-level ozone and fine particle pollution, NO2 is linked with a number of adverse effects on 

the respiratory system. 

Current scientific evidence links short-term NO2 exposures, ranging from 30 minutes to 24 

hours, with adverse respiratory effects including airway inflammation in healthy people and 

increased respiratory symptoms in people with asthma. Also, studies show a connection 

between breathing elevated short-term NO2 concentrations, and increased visits to emergency 

departments and hospital admissions for respiratory issues, especially asthma. 

Washoe County, Nevada May 2011 

Air Quality Trends (2001-2010) 3 
NO2 concentrations in vehicles and near roadways are appreciably higher than those measured 

at monitors in the current network. In fact, in-vehicle concentrations can be 2 to 3 times higher 

than measured at nearby area-wide monitors. Near-roadway (within about 50 meters) 

concentrations of NO2 have been measured to be approximately 30 to 100 percent higher than 

concentrations away from roadways. 

Individuals who spend time on or near major roadways can experience short-term NO2

exposures considerably higher than measured by the current network. Approximately 16 

percent of US housing units (approximately 48 million people) are located within 300 feet of a 

major highway, railroad, or airport. This population likely includes a higher proportion of nonwhite and economically-disadvantaged people. NO2 exposure concentrations near roadways 

are of particular concern for susceptible individuals, including people with asthma asthmatics, 

children, and the elderly. 

NOx react with ammonia, moisture, and other compounds to form small particles. These small 

particles penetrate deeply into sensitive parts of the lungs and can cause or worsen respiratory 

disease, such as emphysema and bronchitis, and can aggravate existing heart disease, leading 

to increased hospital admissions and premature death. Ozone is formed when NOx and volatile 

organic compounds react in the presence of heat and sunlight. Children, the elderly, people 

with lung diseases such as asthma, and people who work or exercise outside are at risk for 

adverse effects from ozone. These include reduction in lung function and increased respiratory 

symptoms as well as respiratory-related emergency department visits, hospital admissions, and 

possibly premature deaths. 

Emissions that lead to the formation of NO2 generally also lead to the formation of other NOx. 

Emissions control measures leading to reductions in NO2 can generally be expected to reduce 

population exposures to all gaseous NOx. This may have the important co-benefit of reducing 

the formation of ozone and fine particles both of which pose significant public health threats. 

Sulfur Dioxide (SO2)

Sulfur dioxide is one of a group of highly reactive gasses known as “oxides of sulfur”. The 

largest sources of SO2 emissions are from fossil fuel combustion at power plants (66 percent) 

and other industrial facilities (29 percent). Smaller sources of SO2 emissions include industrial 

processes such as extracting metal from ore, and the burning of high sulfur containing fuels by 

locomotives, large ships, and non-road equipment. SO2 is linked with a number of adverse 

effects on the respiratory system. 

Current scientific evidence links short-term exposures to SO2, ranging from 5 minutes to 24 

hours, with an array of adverse respiratory affects including bronchoconstriction and increased 

asthma symptoms. These effects are particularly important for asthmatics at elevated 

ventilation rates (i.e., while exercising or playing.). Studies also show a connection between 

short-term exposure and increased visits to emergency departments and hospital admissions 

for respiratory illnesses, particularly in at-risk populations including children, the elderly, and 

asthmatics. 

EPA’s SO2 NAAQS is designed to protect against exposure to the entire group of sulfur oxides 

(SOx). SO2 is the component of greatest concern and is used as the indicator for the larger 

group of SOx. Other gaseous sulfur oxides (i.e., SO3) are found in the atmosphere at 

concentrations much lower than SO2. 

Washoe County, Nevada May 2011 

Air Quality Trends (2001-2010) 4 
Emissions leading to high concentrations of SO2 generally also lead to the formation of other 

SOx. Control measures that reduce SO2 can generally be expected to reduce people’s 

exposures to all gaseous SOx. This may have the important co-benefit of reducing the 

formation of fine sulfate particles, which pose significant public health threats. 

SOx can react with other compounds in the atmosphere to form small particles. These particles 

penetrate deeply into sensitive parts of the lungs and can cause or worsen respiratory disease, 

such as emphysema and bronchitis, and can aggravate existing heart disease, leading to 

increased hospital admissions and premature death. EPA’s PM NAAQS are designed to 

provide protection against these health effects. 

Lead (Pb)

Lead is a metal found naturally in the environment as well as in manufactured products. The 

major sources of lead emissions have historically been motor vehicles (such as cars and trucks) 

and industrial sources. As a result of EPA’s efforts to remove lead from gasoline, ambient lead 

levels decreased 94 percent between 1980 and 1999. Today, the highest levels of Pb in air are 

usually found near lead smelters. Other stationary sources are waste incinerators, utilities, and 

lead -acid battery manufacturers. 

In addition to exposure to lead in air, other major exposure pathways include ingestion of lead in 

drinking water and lead-contaminated food as well as incidental ingestion of lead-contaminated 

soil and dust. Lead-based paint remains a major exposure pathway in older homes. 

Once taken into the body, lead distributes throughout the body in the blood and is accumulated 

in the bones. Depending on the level of exposure, lead can adversely affect the nervous 

system, kidney function, immune system, reproductive and developmental systems and the 

cardiovascular system. Lead exposure also affects the oxygen carrying capacity of the blood. 

The effects most commonly encountered in current populations are neurological effects in 

children and cardiovascular effects (i.e., high blood pressure and heart disease) in adults. 

Infants and young children are especially sensitive to even low levels of lead, which may 

contribute to behavioral problems, learning deficits, and lowered IQ. 

Washoe County, Nevada May 2011 

Air Quality Trends (2001-2010) 5 
NATIONAL AMBIENT AIR QUALITY STANDARDS 

The Clean Air Act requires the EPA to establish NAAQS for pollutants considered harmful to 

public health and the environment. Two types of NAAQS have been established; primary and 

secondary standards. Primary standards set limits to protect public health, especially that of 

sensitive populations such as asthmatics, children, and seniors. Secondary standards set limits 

to protect public welfare, including protections against decreased visibility, damage to animals, 

crops, and buildings. 

The EPA has set NAAQS for seven principal pollutants, which are called “criteria” pollutants. 

They are listed in Title 40 of the Code of Federal Regulations (CFR) Part 50 and summarized in 

Table 1 below. The units of measure for the standards are parts per million (ppm) or billion 

(ppb) by volume, milligrams per cubic meter of air (mg/m3

), or micrograms per cubic meter of air 

(μg/m3

). 

Table 1 

National Ambient Air Quality Standards (as of December 31, 2010) 

Primary Standard Secondary Standard 

Pollutant 

Averaging 

Time Concentration 

Averaging 

Time Concentration 

PM10 24-hour 150 g/m3 Same as primary 

24-hour 35 g/m3 Same as primary 

PM2.5

Annual 15.0 g/m3 Same as primary 

O3 8-hour 0.075 ppm Same as primary 

1-hour 35 ppm None 

CO 

8-hour 9 ppm None 

Annual 

(arithmetic mean) 0.053 ppm Same as primary 

NO2

1-hour 100 ppb None 

1-hour 75 ppb None 

SO 24-hour 0.14 ppm 2

Annual 

(arithmetic mean) 0.03 ppm 

3-hour 0.5 ppm 

Rolling 3-month 

average 0.15 g/m3 Same as primary 

Pb 

Quarterly average 1.5 g/m3 Same as primary 

Washoe County, Nevada May 2011 

Air Quality Trends (2001-2010) 6 
Washoe County, Nevada May 2011 

Air Quality Trends (2001-2010) 7 

AMBIENT AIR MONITORING NETWORK 

The AQMD began monitoring ambient air quality in Washoe County in the 1970’s and the 

monitoring network has grown and evolved since this time. This trends report provides a 

summary of data collected from ambient air monitoring sites in Washoe County that the AQMD 

operated and maintained between 2001 and 2010 to measure PM10, PM2.5, O3, CO, and NO2. 

Each monitoring site is classified into one of two major categories - SLAMS (State or Local Air 

Monitoring Station) and SPM (Special Purpose Monitoring). SLAMS consist of a network of 

monitoring stations whose size and distribution is largely determined by the monitoring 

requirements for NAAQS comparison. SLAMS in the AQMD’s network can be further classified 

as NCore (National Core monitoring network) or STN (Speciation Trends Network). 

The AQMD’s monitoring stations are sited in accordance with 40 CFR 58 and utilize equipment 

designated as reference or equivalent methods.1

 In addition, the network is reviewed annually2

to ensure the network meets the monitoring objectives defined in 40 CFR 58, Appendix D. 

Ambient air monitoring data are collected, quality assured,3

 and recorded in AQS. Figure 2 

displays the ambient air monitoring sites operated between 2001 and 2010. For specific details 

regarding the ambient air monitoring network, refer to the AQMD’s “2009 Ambient Air Monitoring 

Network Plan” and “2010 Ambient Air Monitoring Network Assessment”. 

Figure 2 

Washoe County Ambient Air Monitoring Sites (2001-2010) 

 

1

 40 CFR 53. 

2

 40 CFR 58.10. 

3

 40 CFR 58. 
Following is a description of these monitoring sites sorted by operational status. 

Currently Operating

Reno3 (RNO) - (EPA ID #32-031-0016 SLAMS): This downtown site began operation in 

January 2002 to replace the Reno site. Both a residential neighborhood and a 

commercial growth area surround this site which is located at 301 State Street. The 

pollutants measured are PM10, PM2.5, O3, CO, 

and NO2. The monitoring objectives are to 

determine typical concentrations for all 

pollutants monitored. 

Figure 3 

Reno3 

South Reno (SRN) - (EPA ID #32-031-0020 

SLAMS): Located on the NV Energy property at 

4110 Delucchi Lane, this background site is in 

a transitional environment between open fields 

and office buildings. The site monitors for 

typical concentrations for PM10 and CO. The 

site also monitors for highest concentrations of 

O3, which forms downwind of the sources of the 

photochemical precursors. 

Galletti (GAL) - (EPA ID #32-031-0022 SLAMS): This site is in the State of Nevada 

Department of Motor Vehicles and Department of Transportation yards at 305 Galletti 

Way in Reno. It is located southeast of the Interstate 80 - US Highway 395 interchange 

in a commercial/industrial area. The Galletti site, which monitors PM10 and CO, is 

heavily impacted by on-road vehicle emissions from interstate highways. The monitoring 

objective is to determine highest concentrations of the pollutants monitored. 

Figure 4 

Toll Road 

Toll Road (TOL) - (EPA ID # 32-031-0025 SLAMS): The Toll 

Road site is located at 684A State Route 341 (Geiger Grade), 

one-half mile east of US Highway 395. The site is near the 

edge of a residential neighborhood and adjacent to an area 

that may become commercially developed. It is a background 

site for PM10 and CO. This site also monitors typical 

concentrations of O3. A nearby school bus depot is not 

believed to have impacted the site. 

Plumb-Kit (PLM) - (EPA ID # 32-031-0030 SLAMS): The 

Plumb-Kit site is located on the northeast corner of Plumb 

Lane and Kietzke Avenue. The only pollutant measured at this 

site is PM10 (SLAMS). The monitoring objective is to 

determine typical concentrations of PM10. 

Sparks (SPK) - (EPA ID #32-031-1005 SLAMS): The Sparks site is located on US Postal 

Service property at 750 Fourth Street in a residential area and measures PM10, O3, and 

CO. Its monitoring objective is to determine typical concentrations for the pollutants 

monitored. 

Washoe County, Nevada May 2011 

Air Quality Trends (2001-2010) 8 
Incline Village (INC) - (EPA ID #32-031-2002 SLAMS): Located at the Washoe County 

public library at 855 Alder Drive, this site is outside HA 87. It is located in a 

residential/commercial neighborhood, where the monitoring objective is to determine 

typical concentrations for the pollutants monitored. The AQMD had monitored PM10

(1993-2002) and CO (1993-2002) and currently monitors for O3. This site was 

temporarily closed from December 2005 to May 2008 for 

remodeling. By multi-agency cooperative agreement, the 

California Air Resources Board (CARB) monitored PM2.5

(1999-2002) and NO2 (1999-2002). Since May 2008 this site 

only monitors for O3. 

Figure 5 

Lemmon Valley 

Lemmon Valley (LEM) - (EPA ID #32-031-2009 SLAMS): 

Located at the Joe Mitchell Community Center at 325 Patrician 

Drive, this site is outside HA 87. It is in a transitional area 

among residences, parks, and open fields. The pollutants 

monitored are O3 and CO. The monitoring objective is to 

determine general background concentrations. 

No Longer Operating

Reno (RNO) - (EPA ID #32-031-0016 SLAMS/SPMS): This site was located in a 

downtown Reno commercial area at 250 North Lake Street. In April 1995, it was 

relocated approximately 300 feet north to the southwest corner of Plaza Street and 

Evans Avenue. The pollutants measured were PM10, O3, and CO (SLAMS). In addition, 

special purpose monitoring (SPMS) for NO2 began in 1996 and was reclassified as 

(SLAMS) in 2005. PM2.5 monitoring (SLAMS) began in 1999. The Reno site was 

displaced and shut down in January 2003 because of the ReTRAC (Reno Transportation 

Rail Access) Project. 

Sun Valley (SUN) - (EPA ID #32-031-2006 SLAMS): This PM10 site at 5399 Sun Valley 

Drive was located in a residential area outside HA 87. PM10 monitoring continued until 

the site was shut down in March 2005. 

Mustang (MST) - (SPMS): This remote site was located north of Interstate 80 near the 

Mustang exit (Exit 23) in southeastern Washoe County and is no longer used. The 

Mustang site was operational from 1993 to 2002 and monitored PM10 (1993-1998), O3

(1993-2002), and CO (1995-1998). 

Washoe County, Nevada May 2011 

Air Quality Trends (2001-2010) 9 
A REVIEW of 2010 

The year began with several consecutive days of stable atmospheric conditions and strong 

temperature inversions. The lowest temperature of the month (18 degrees) occurred on 

January 4. The low temperature and the strong inversions were contributing factors to a 24-

hour PM2.5 concentration and NAAQS exceedance of 38.8 g/m3

 on January 5. 

The lowest pressure ever recorded at the Reno-Tahoe International Airport (RTIA) occurred on 

January 21 when the sea level pressure dropped to 28.91 inches. 

A period of cool and wet weather in late May led to a slow start to the 2010 fire season. The 

first large wildfire did not occur until the final week of July due to several days of thunderstorms. 

Fire activity was sparse during the remainder of the summer with a widespread wetting rain in 

early October resulting in an early end to the fire season. 

The RTIA tied a record of 35 consecutive days (July 5 through August 8) with a high 

temperature of 90 degrees or more. The highest 8-hour O3 concentration during this period was 

0.074 ppm (August 5). The only O3 exceedance (0.077 ppm) of the summer occurred after this 

period on August 20. 

The year ended with above normal precipitation in November and December. These unsettled 

conditions prevented any significant periods of stagnation. The highest PM2.5 concentration 

during these two months was 24.4 g/m3

 which occurred on December 1. 

Table 2 summarizes NAAQS exceedances in 2010 by pollutant, averaging period, and dates. 

Table 2 

2010 Exceedances Summary 

Pollutant 

Averaging 

Period Exceedance Dates 

PM10 24-hour none 

PM2.5 24-hour Jan 5 

O3 8-hour Aug 20 

1-hour none 

CO 

8-hour none 

NO2 1-hour none 

1-hour 

SO2 24-hour 

3-hour 

n/a - Monitoring began at the 

RNO site on January 1, 2011. 

3-month 

Pb 

quarterly 

Not required to monitor based on population 

size and lack of significant Pb sources. 

Washoe County, Nevada May 2011 

Air Quality Trends (2001-2010) 10 
Figure 6 summarizes the 2010 air quality by month and Air Quality Index (AQI) categories. The 

AQI is an index for reporting daily air quality that has been established by EPA which informs 

the public how clean or polluted the air is, and what associated health effects might be a 

concern. The AQI is reported to the public via an email list and the AQMD’s air quality hotline 

((775) 785-4110). This hotline is updated daily, and more often during air pollution episodes. 

PM, CO, and NO2 concentrations are typically higher in the winter months while higher O3

concentrations are more typical during the summer months. 

The AQMD operates two types of monitors for PM10 and PM2.5 - Beta Attenuation Monitors 

(BAMs) and filter-based monitors. BAMs collect PM data on an hourly basis 24 hours per day, 

365 days per year. In 2010, BAM data were used for AQI purposes only and were not used to 

determine NAAQS exceedances nor compliance. 

Filter-based PM monitors were used for NAAQS compliance and operated on a 1 in 3, or 1 in 6 

day sampling schedule. These sampling schedules provide approximately 122 (1 in 3) or 61 (1 

in 6) samples per year. EPA provides design value calculation guidance which makes “less 

than daily sampling” data statistically equivalent to daily methods. Because of these differences 

in PM monitoring frequency for AQI and NAAQS compliance purposes, the totals in Table 2 may 

not be consistent with the data in Figures 6-8. 

Figure 6 

Monthly AQI Summary for All Pollutants (2010) 

0

5

10

15

20

25

30

35

Days per Month

Good 17 23 29 26 25 17 15 9 18 29 26 22 

Moderate 12 5 2 4 6 13 16 21 12 2 4 9 

USG* 2 - - - - - - 1 - - - - 

Unhealthy - - - - - - - - - - - - 

Very Unhealthy - - - - - - - - - - - - 

Hazardous - - - - - - - - - - - - 

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

* Unhealthy for Sensitive Groups

** See footnote on Figure 8. 

The next four figures are pollutant specific and summarize Washoe County’s air quality for the 

previous year by pollutant, month, and AQI categories. 

Washoe County, Nevada May 2011 

Air Quality Trends (2001-2010) 11 
Figure 7 

Monthly AQI Summary of PM10 (2010) 

0

5

10

15

20

25

30

35

Days per Month

Good 23 25 29 30 31 30 29 31 30 31 26 22

Moderate 8 3 2 - - - 2 - - - 4 9 

USG* - - - - - - - - - - - - 

Unhealthy - - - - - - - - - - - - 

Very Unhealthy - - - - - - - - - - - - 

Hazardous - - - - - - - - - - - - 

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

Figure 8 

Monthly AQI Summary of PM2.5 (2010) 

0

5

10

15

20

25

30

35

Days per Month

Good 17 26 31 30 31 30 30 31 30 20 - - 

Moderate 12 2 - - - - 1 - - - - - 

USG* 2 - - - - - - - - - - - 

Unhealthy - - - - - - - - - - - - 

Very Unhealthy - - - - - - - - - - - - 

Hazardous - - - - - - - - - - - - 

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

* Unhealthy for Sensitive Groups 

** Although PM2.5 monitors for short-term AQI forecasts were offline for an extended period of 

maintenance (Oct 21 - Dec 31), other PM2.5 monitors for NAAQS compliance purposes were 

operational during this period. Figures 6, 8, and 11 reflect these missing PM2.5 AQI data. 

Washoe County, Nevada May 2011 

Air Quality Trends (2001-2010) 12 
Figure 9 

Monthly AQI Summary of O3 (2010) 

0

5

10

15

20

25

30

35

Days per Month

Good 31 28 30 26 25 17 15 9 18 29 30 31

Moderate - - 1 4 6 13 16 21 12 2 - - 

USG* - - - - - - - 1 - - - - 

Unhealthy - - - - - - - - - - - - 

Very Unhealthy - - - - - - - - - - - - 

Hazardous - - - - - - - - - - - - 

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

Figure 10 

Monthly AQI Summary of CO (2010) 

0

5

10

15

20

25

30

35

Days per Month

Good 31 28 31 30 31 30 31 31 30 31 30 31

Moderate - - - - - - - - - - - - 

USG* - - - - - - - - - - - - 

Unhealthy - - - - - - - - - - - - 

Very Unhealthy - - - - - - - - - - - - 

Hazardous - - - - - - - - - - - - 

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

* Unhealthy for Sensitive Groups 

Washoe County, Nevada May 2011 

Air Quality Trends (2001-2010) 13 
CURRENT DESIGN VALUES and ATTAINMENT STATUS 

Table 3 summarizes Washoe County’s current design values and designations for each 

NAAQS. The designations are also codified in 40 CFR 81.329. 

Table 3 

Design Values and Attainment Status (as of December 31, 2010) 

NAAQS 

Pollutant Averaging Time Level Design Value Designation (Geographic Area) 

“Serious” Non-Attainment (HA 87) 

PM10 24-hour 150 g/m3

0.0 

(Expected 

Exceedances) Unclassifiable (Remainder of County) 

Attainment (HA 87) 

24-hour 35 g/m3 37 g/m3

Unclassifiable / Attainment 

(Remainder of County) 

Attainment (HA 87) 

PM2.5* 

Annual 15.0 g/m3 8.1 g/m3

Unclassifiable / Attainment 

(Remainder of County) 

O3* 8-hour 0.075 ppm 0.070 ppm Unclassifiable / Attainment 

(Entire County) 

Attainment (HA 87) 

1-hour 35 ppm 3.1 ppm Unclassifiable/ Attainment 

(Remainder of County) 

Attainment (HA 87) 

CO 

8-hour 9 ppm 2.6 ppm Unclassifiable / Attainment 

(Remainder of County) 

Annual 

(arithmetic mean) 0.053 ppm 0.016 ppm Cannot be classified or better than national standards (Entire County) NO2

1-hour 100 ppb 59.0 ppb n/a (Entire County) 

Promulgated in 2010. 

1-hour 75 ppb n/a n/a (Entire County) 

Promulgated in 2010. 

SO2 24-hour 0.14 ppm n/a 

Annual 

(arithmetic mean) 0.03 ppm n/a 

Better than national standards 

(Entire County) - Revoked in 2010. 

Rolling 3-month 

average 0.15 g/m3 n/a 

Pb Quarterly 

Average 1.5 g/m3 n/a 

Will be designated during the 

second round of designations by 

October 15, 2011. 

* PM2.5 and O3 ambient air monitoring data from June/July 2008 were influenced by wildfires in Northern California. An exceptional 

events request was submitted to EPA Region IX in October 2009. As of May 1, 2011, EPA has not taken final action. The PM2.5

and O3 design values will include these data until EPA determines concurrence with the request. 

Washoe County, Nevada May 2011 

Air Quality Trends (2001-2010) 14 
TEN-YEAR AIR QUALITY TREND 

Figure 11 summarizes the ten-year trend in AQI between 2001 and 2010. NAAQS revisions in 

2006 and 2008 resulted in changes to AQI category ranges and the number of days per year 

within those ranges. 

Figure 11 

AQI Trend (2001-2010) 

0

50

100

150

200

250

300

350

Days per Year

Good 252 238 245 244 250 307 308 237 263 258 

Moderate 113 127 120 122 113 58 57 108 92 104 

USG* - - - - 2 - - 11 8 3 

Unhealthy - - - - - - - 9 2 - 

Very Unhealthy - - - - - - - 1 - - 

Hazardous - - - - - - - - - - 

2001 2002 2003 2004 2005 2006 2007 2008 2009 2010

* Unhealthy for Sensitive Groups 

Notes

 2006: 1-hour O3 NAAQS rescinded. Reporting of AQI for 1-hour O3 discontinued in June. 

 Reporting of AQI for 8-hour O3 began in June. 

 24-hour PM2.5 NAAQS lowered from 65 to 35 g/m3

. 

 2007: Reporting of AQI for PM2.5 began in July. 

 2008: 8-hour O3 NAAQS lowered from 0.08 to 0.075 ppm. 

 2010: No AQI for PM2.5 from Oct 21 to Dec 31. 

The next subsection provides one-page summaries of the ten-year trend for each pollutant 

monitored. The summaries also provide information about the latest year including 

exceedances, maximum concentrations, and design values. 

Washoe County, Nevada May 2011 

Air Quality Trends (2001-2010) 15 
PM10 (24-hour) 

NAAQS Level: 150 g/m3

Current Designation: “Serious” Non-Attainment (HA 87), and Unclassifiable (Remainder of 

County) 

2010 Exceedances: 0 

2010 Expected Exceedances: 0.0 

2010 First High: 142 g/m3 (Jan 5 - RNO) 

2010 Design Value: 0.0 expected exceedances 

Notes: In 2006, EPA retained the 24-hour NAAQS of 150 g/m3

 and revoked the annual 

NAAQS of 50 g/m3

 (71 FR 61144). In July 2009, a revision to the PM10 State Implementation 

Plan (SIP) was submitted to EPA Region IX requesting redesignation of HA 87 to 

Attainment/Maintenance of the 24-hour NAAQS. [Additional notes: On April 19, 2011, EPA 

published a final rule (76 FR 21807) finding that the:1) Truckee Meadows failed to attain the 

NAAQS by the applicable date; and 2) the Truckee Meadows is currently attaining the NAAQS 

based on recent monitoring data (2007-2009). The rule does not change the “Serious” nonattainment designation.] In 2010, 1 in 3 day sampling began at the Reno3 site. The remainder 

of the PM10 network operates on a 1 in 6 day sampling schedule. 

Figure 12 

24-hour PM10 Concentrations (1st Highs) 

NAAQS

0

20

40

60

80

100

120

140

160

180

200

Concentration (g/m3

)

NAAQS 150 150 150 150 150 150 150 150 150 150

0016 (RNO) 92 66 69 83 79 91 69 92 78 142

0020 (SRN) 112 45 61 54 71 58 75 111 59 52

0022 (GAL) 113 97 108 126 173 118 130 87 91 87

0025 (TOL) 144 57 64 64 75 47 43 64 46 34

0030 (PLM) - - - - - 91 108 86 93 77

1005 (SPK) 78 73 85 90 72 76 76 101 67 55

2002 (INC) 136 64 - - - - - - - -

2006 (SUN) 81 81 100 74 82 - - - - -

2001 2002 2003 2004 2005 2006 2007 2008 2009 2010

Washoe County, Nevada May 2011 

Air Quality Trends (2001-2010) 16 
PM2.5 (24-hour) 

NAAQS Level: 35 g/m3

Current Designation: Attainment (HA 87), and Unclassifiable/Attainment (Remainder of County) 

2010 Exceedances: 1 (Jan 5 - RNO) 

2010 First High: 38.8 g/m3

 (Jan 5 - RNO) 

2010 98th Percentile: 16.3 g/m3

 (Jan 8 - RNO) 

2010 Design Value: 37 g/m3

Notes: PM2.5 was monitored at one site (RNO) during this period. In 2006, EPA revised and 

lowered the NAAQS from 65 to 35 g/m3

 (71 FR 61144). Ambient air monitoring data from 

June/July 2008 were influenced by wildfires in Northern California. An exceptional events 

request was submitted to EPA Region IX in October 2009. As of May 10, 2011, EPA has not 

taken action on the request and is not anticipated to do so. The design values will include these 

data unless EPA determines concurrence with the request. 

Figure 13 

24-hour PM2.5 Concentrations (3-year Average of 98th Percentiles; 1st Highs; 

and 98th Percentiles) 

NAAQS (2006)

NAAQS (1997)

0

20

40

60

80

100

120

140

Concentration (g/m3

)

NAAQS 65 65 65 65 65 35 35 35 35 35

0016 (RNO) 35.3 33.0 29.0 24.7 29.6 32.2 30.6 34.9 39.4 36.8

1st High 48.6 32.1 22.5 29.8 63.5 28.7 26.9 114.7 52.6 38.8

98th %tile 41.8 25.8 19.4 28.8 40.7 27.0 24.0 53.6 40.5 16.3

2001 2002 2003 2004 2005 2006 2007 2008 2009 2010

Washoe County, Nevada May 2011 

Air Quality Trends (2001-2010) 17 
PM2.5 (Annual) 

NAAQS Level: 15 g/m3

Current Designation: Attainment (HA 87), and Unclassifiable/Attainment (Remainder of County) 

2010 Annual Average: 6.0 g/m3

2010 Design Value: 8.1 g/m3

Notes: PM2.5 was monitored at one site (RNO) during this period. In 2006, EPA reviewed and 

retained the annual NAAQS of 15 g/m3

 (71 FR 61144). Ambient air monitoring data from 

June/July 2008 were influenced by wildfires in Northern California. An exceptional events 

request was submitted to EPA Region IX in October 2009. As of May 10, 2011, EPA has not 

taken action on the request and is not anticipated to do so. The design values will include these 

data unless EPA determines concurrence with the request. 

Figure 14 

Annual PM2.5 Concentrations and Design Values 

NAAQS

0

5

10

15

20

25

30

35

Concentration (g/m3

)

Annual Ave. 10.3 9.1 7.3 8.1 9.0 7.6 8.6 10.1 7.9 6.0

NAAQS 15 15 15 15 15 15 15 15 15 15

Design Value 9.7 9.4 8.9 8.2 8.1 8.2 8.2 8.6 8.7 8.1

2001 2002 2003 2004 2005 2006 2007 2008 2009 2010

Washoe County, Nevada May 2011 

Air Quality Trends (2001-2010) 18 
O3 (8-hour) 

NAAQS Level: 0.075 ppm 

Current Designation: Unclassifiable/Attainment (Entire County) 

2010 Exceedances: 1 (Aug 20 - TOL) 

2010 First High: 0.077 ppm (Aug 20- TOL) 

2010 Fourth High: 0.070 ppm (Jul 27 - TOL) 

2010 Design Value: 0.070 ppm 

Notes: The NAAQS was revised and lowered in 2008 from 0.08 to 0.075 ppm (73 FR 16436). 

Ambient air monitoring data from June/July 2008 were influenced by wildfires in Northern 

California. An exceptional events request was submitted to EPA Region IX in October 2009. 

As of May 10, 2011, EPA has not taken action on the request and is not anticipated to do so. 

The design values will include these data unless EPA determines concurrence with the request. 

Figure 15 

8-hour O3 Concentrations (3-year Average of 98th Percentiles) 

NAAQS (1997)

NAAQS (2008)

0.055

0.060

0.065

0.070

0.075

0.080

0.085

Concentration (ppm)

NAAQS 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.075 0.075 0.075

0016 (REN) 0.071 0.069 0.069 0.073 0.071 0.070 0.070 0.073 0.070 0.069

0020 (SRN) 0.071 0.072 0.072 0.074 0.072 0.070 0.071 0.071 0.067 0.065

0025 (TOL) 0.070 0.070 0.069 0.070 0.069 0.068 0.065 0.069 0.068 0.070

1005 (SPK) 0.073 0.072 0.072 0.074 0.071 0.070 0.071 0.073 0.070 0.069

2002 (INC) 0.067 0.067 0.068 0.067 0.065 - - 0.072 0.067 0.065

2009 (LEM) 0.064 0.066 0.064 0.063 0.064 0.067 0.070 0.074 0.072 0.070

SPSM (MST) 0.073 - - - - - - - - -

2001 2002 2003 2004 2005 2006 2007 2008 2009 2010

Washoe County, Nevada May 2011 

Air Quality Trends (2001-2010) 19 
CO (8-hour) 

NAAQS Level: 9 ppm 

Current Designation: Attainment (HA 87), and Unclassifiable/Attainment (Remainder of County) 

2010 Exceedances: 0 

2010 First High: 2.8 ppm (Dec 24 - SPK) 

2010 Second High: 2.6 ppm (Dec 25 - SPK) 

2010 Design Value: 2.6 ppm 

Notes: The last measured exceedance of the 8-hour NAAQS occurred in December 1991. 

Figure 16 

8-hour CO Concentrations (2nd Highs) 

NAAQS

0

1

2

3

4

5

6

7

8

9

10

Concentration (ppm)

NAAQS 9999999999

0016 (RNO) 3.7 4.0 2.6 2.5 2.9 2.6 2.2 1.6 2.1 1.8

0020 (SRN) 2.4 2.1 2.4 2.0 2.1 1.9 1.8 1.3 1.5 1.4

0022 (GAL) 5.2 4.4 3.6 3.9 3.2 3.2 3.3 2.4 2.3 1.9

0025 (TOL) 1.8 1.1 1.2 1.1 1.8 1.4 1.2 0.9 1.4 0.9

1005 (SPK) 4.6 4.4 3.8 3.9 3.2 3.0 3.1 2.8 2.9 2.6

2002 (INC) 1.7 1.4 - - - - - - - -

2009 (LEM) 2.4 2.3 1.9 2.1 1.8 1.9 1.8 1.5 1.5 1.3

2001 2002 2003 2004 2005 2006 2007 2008 2009 2010

Washoe County, Nevada May 2011 

Air Quality Trends (2001-2010) 20 
CO (1-hour) 

NAAQS Level: 35 ppm 

Current Designation: Attainment (HA 87), and Unclassifiable/Attainment (Remainder of County) 

2010 Exceedances: 0 

2010 First High: 3.4 ppm (Jan 6 - SPK) 

2010 Second High: 3.1 ppm (Jan 15 - SPK) 

2010 Design Value: 3.1 ppm 

Notes: The AQMD has never measured an exceedance of the 1-hour NAAQS. 

Figure 17 

1-hour CO Concentrations (2nd Highs) 

NAAQS

0

5

10

15

20

25

30

35

40

Concentration (ppm)

NAAQS 35 35 35 35 35 35 35 35 35 35

0016 (RNO) 5.7 6.4 4.8 3.7 4.0 3.5 3.5 2.5 2.9 2.6

0020 (SRN) 4.6 3.1 3.1 3.1 2.5 2.5 2.2 1.7 1.9 1.9

0022 (GAL) 7.1 6.9 6.1 5.3 4.0 4.8 4.1 3.4 3.0 2.7

0025 (TOL) 2.1 1.9 1.8 1.6 1.9 2.2 1.9 1.7 1.6 1.2

1005 (SPK) 7.0 6.7 6.1 5.8 4.4 4.5 4.7 3.8 4.2 3.1

2002 (INC) 2.6 2.0 - - - - - - - -

2009 (LEM) 3.6 4.5 3.7 3.2 2.7 3.4 3.3 1.9 2.6 1.8

2001 2002 2003 2004 2005 2006 2007 2008 2009 2010

Washoe County, Nevada May 2011 

Air Quality Trends (2001-2010) 21 
NO2 (1-hour) 

NAAQS Level: 100 ppb (Promulgated in 2010) 

Current Designation: Initial recommendations of “Attainment” (HA 87) and “Unclassifiable” 

(Remainder of the County) were submitted to the Nevada Division of Environmental Protection 

(NDEP) on December 3, 2010. [Additional note: NDEP concurred with the AQMD 

recommendations and recommended the same initial designations to EPA Region IX on 

January 11, 2011. As of May 10, 2011, EPA has not taken final action.] 

2010 Exceedances: 0 

2010 First High: 81 ppb (Dec 1 - RNO) 

2010 98th Percentile: 55 ppb (Sep 24 - RNO) 

2010 Design Value: 59 ppb 

Notes: NO2 was monitored at one site (RNO) during this period. In 2010, EPA established a 

new 1-hour NAAQS of 100 ppb (75 FR 6474). 

Figure 18 

1-hour NO2 Concentrations (1st Highs, 98th Percentiles, and 3-Year Average of 98th Percentiles) 

NAAQS

0

20

40

60

80

100

120

140

160

180

200

Concentration (ppb)

NAAQS - - - - - - - - - 100

1st High 143 117 80 82 125 93 72 75 96 81

98th %tile - - - - - - - - 50 55

0016 (RNO) - - - - - - - - 62 59

2001 2002 2003 2004 2005 2006 2007 2008 2009 2010

Washoe County, Nevada May 2011 

Air Quality Trends (2001-2010) 22 
NO2 (Annual) 

NAAQS Level: 0.053 ppm 

Current Designation: Attainment 

2010 Annual Average: 0.016 ppm 

2010 Design Value: 0.016 ppm 

Notes: NO2 was monitored at one site (RNO) during this period. In 2010, EPA reviewed and 

retained the annual NAAQS of 0.053 ppm (75 FR 6474). 

Figure 19 

Annual NO2 Concentrations 

NAAQS

0.000

0.010

0.020

0.030

0.040

0.050

0.060

0.070

0.080

0.090

0.100

Concentration (ppm)

0016 (RNO) 0.027 0.023 0.028 0.021 0.021 0.020 0.019 0.018 0.017 0.016

NAAQS 0.053 0.053 0.053 0.053 0.053 0.053 0.053 0.053 0.053 0.053

2001 2002 2003 2004 2005 2006 2007 2008 2009 2010

Washoe County, Nevada May 2011 

Air Quality Trends (2001-2010) 23 
SO2 (1-hour, 24-hour, and Annual) 

NAAQS Level (1-hour): 75 ppb (Promulgated in 2010) 

NAAQS Level (24-hour): 0.14 ppm (Revoked in 2010) 

NAAQS Level (Annual): 0.03 ppm (Revoked in 2010) 

Current Designations: 1-hour (Promulgated in 2010) - See Notes; 24-hour (Revoked in 2010) - 

Attainment; Annual (Revoked in 2010) - Attainment 

Notes: In 2010, EPA established a new 1-hour NAAQS of 75 ppb (75 FR 35520). In that same 

rule, EPA revoked the 24-hour and annual NAAQS. SO2 monitoring began at the RNO site on 

January 1, 2011. On May 3, 2011, the Nevada Division of Environmental Protection submitted 

an initial recommendation of “Unclassifiable” for all hydrographic areas in the State of Nevada 

for the 1-hour SO2 NAAQS to EPA Region IX. 

Figure 20 

SO2 Concentrations 

NAAQS

0

20

40

60

80

100

120

140

160

180

200

Concentration (ppb)

NAAQS - - - - - - - - - 75

1st High ----------

0016 (RNO) ----------

2001 2002 2003 2004 2005 2006 2007 2008 2009 2010

Washoe County, Nevada May 2011 

Air Quality Trends (2001-2010) 24 
Appendix A 

Detailed Summary of Three Most Recent Years of Data 
Washoe County

Ambient Air Monitoring Data

(2010)
Pollutant Averaging Period Exceedance Dates

PM10 24-hour none

PM2.5 24-hour Jan 5.

O3 8-hour Aug 20.

1-hour none

8-hour none

NO2 1-hour none

1-hour

24-hour

3-hour

3-month

quarterly

Pb n/a - Pb was not monitored in 2010.

Exceedances (2010)

CO

SO2 n/a - Monitoring began at the RNO site on January 1, 2011.

10-1
Location: Galletti 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.5 2.3 6/2 1.9 6/10 1.6 3/4 1

FEB 0.5 1.4 28/5 1.3 14/7 1.2 4/10 1

MAR 0.4 1.1 16/9 1.0 11/7 0.9 12/9 0

APR 0.4 1.1 24/6 0.9 8/7 0.9 23/6 0

MAY 0.3 0.7 3/9 0.7 25/7 0.6 12/7 0

JUN 0.3 1.0 14/5 0.9 15/6 0.9 30/6 0

JUL 0.3 0.5 2/10 0.5 16/8 0.5 31/7 0

AUG 0.3 0.7 26/7 0.5 13/9 0.5 17/9 0

SEP 0.3 0.9 18/7 0.8 25/1 0.8 28/7 0

OCT 0.3 1.0 29/10 1.0 28/7 0.9 30/2 0

NOV 0.5 1.9 27/1 1.6 15/3 1.4 14/2 1

DEC 0.6 1.9 23/3 1.8 13/0 1.6 24/7 1

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.4 2.3 Jan 6/2 1.9 Jan 6/10 1.9 Nov 27/1 1

* Hour Beginning

2010 ANNUAL SUMMARY

CARBON MONOXIDE (ppm) - EIGHT (8) HOUR AVERAGES

10-2
Location: Lemmon Valley 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.6 1.7 6/1 1.3 3/1 1.2 5/7 1

FEB 0.5 1.0 14/1 1.0 2/9 1.0 23/1 0

MAR 0.5 1.0 16/8 1.0 15/8 0.9 19/7 0

APR 0.4 0.8 7/6 0.7 24/2 0.7 10/2 0

MAY 0.2 0.5 7/6 0.4 14/3 0.4 3/5 0

JUN 0.2 0.3 28/6 0.3 26/22 0.3 29/8 0

JUL 0.2 0.4 5/1 0.3 25/6 0.3 3/19 0

AUG 0.2 0.4 24/5 0.4 25/3 0.3 13/1 0

SEP 0.2 0.4 25/2 0.4 2/3 0.4 7/3 0

OCT 0.1 0.5 30/2 0.4 27/2 0.4 29/8 0

NOV 0.3 1.0 27/1 0.8 12/1 0.8 30/1 0

DEC 0.3 1.1 24/1 1.0 2/6 0.8 25/3 0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.3 1.7 Jan 6/1 1.3 Jan 3/1 1.2 Jan 5/7 1

* Hour Beginning

2010 ANNUAL SUMMARY

CARBON MONOXIDE (ppm) - EIGHT (8) HOUR AVERAGES

10-3
Location: Reno3 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.4 1.8 6/0 1.8 5/12 1.5 17/0 1

FEB 0.2 1.0 28/6 0.8 4/11 0.8 23/23 0

MAR 0.1 0.5 12/9 0.4 14/2 0.3 28/7 0

APR 0.1 0.4 23/9 0.4 8/7 0.4 24/7 0

MAY 0.1 0.2 7/1 0.1 3/9 0.1 30/0 0

JUN 0.0 0.2 2/9 0.1 6/6 0.1 22/14 0

JUL 0.0 0.1 16/8 0.1 25/3 0.1 31/6 0

AUG 0.1 0.5 8/7 0.5 6/22 0.5 9/1 0

SEP 0.1 0.4 24/22 0.2 27/19 0.2 29/19 0

OCT 0.1 0.5 21/8 0.4 22/9 0.3 27/0 0

NOV 0.2 1.3 15/1 1.2 30/23 1.0 27/2 0

DEC 0.3 1.9 1/12 1.3 23/12 1.0 21/23 1

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.1 1.9 Dec 1/12 1.8 Jan 6/0 1.8 Jan 5/12 1

* Hour Beginning

2010 ANNUAL SUMMARY

CARBON MONOXIDE (ppm) - EIGHT (8) HOUR AVERAGES

10-4
Location: South Reno 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.7 1.6 5/23 1.4 5/11 1.3 6/11 1

FEB 0.6 1.0 23/10 0.9 2/12 0.9 12/11 0

MAR 0.4 0.8 14/8 0.8 1/9 0.8 12/8 0

APR 0.3 0.7 27/20 0.7 28/19 0.7 29/21 0

MAY 0.2 0.4 7/7 0.4 3/7 0.4 12/7 0

JUN 0.2 0.3 2/8 0.3 15/7 0.3 24/8 0

JUL 0.2 0.3 16/9 0.3 27/8 0.3 9/8 0

AUG 0.2 0.4 26/7 0.3 24/9 0.3 25/11 0

SEP 0.2 0.4 30/23 0.4 29/12 0.3 26/0 0

OCT 0.3 0.7 28/13 0.6 30/0 0.6 29/9 0

NOV 0.3 0.8 30/23 0.8 27/2 0.7 5/12 0

DEC 0.3 0.9 23/11 0.9 1/9 0.8 1/21 0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.3 1.6 Jan 5/23 1.4 Jan 5/11 1.3 Jan 6/11 1

* Hour Beginning

2010 ANNUAL SUMMARY

CARBON MONOXIDE (ppm) - EIGHT (8) HOUR AVERAGES

10-5
Location: Sparks 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.8 2.5 6/8 2.1 16/10 2.0 15/10 2

FEB 0.8 1.8 1/3 1.8 28/4 1.8 14/4 1

MAR 0.7 1.6 15/8 1.6 11/6 1.5 16/7 1

APR 0.4 1.0 2/8 1.0 7/6 0.9 1/9 0

MAY 0.3 0.8 12/6 0.8 3/5 0.7 14/6 0

JUN 0.3 0.7 27/3 0.6 14/2 0.5 13/4 0

JUL 0.3 0.8 5/3 0.6 25/4 0.5 16/6 0

AUG 0.2 0.6 25/9 0.5 13/5 0.5 26/7 0

SEP 0.3 1.1 30/0 1.0 25/1 1.0 26/3 0

OCT 0.4 1.4 28/8 1.2 30/2 1.0 9/1 1

NOV 0.7 1.8 14/4 1.8 26/2 1.7 29/7 1

DEC 0.7 2.8 24/2 2.6 25/4 2.3 23/2 2

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.5 2.8 Dec 24/2 2.6 Dec 25/4 2.5 Jan 6/8 2

* Hour Beginning

2010 ANNUAL SUMMARY

CARBON MONOXIDE (ppm) - EIGHT (8) HOUR AVERAGES

10-6
Location: Toll 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.3 0.8 16/0 0.6 17/7 0.5 25/10 0

FEB 0.2 0.6 23/12 0.4 22/12 0.4 2/10 0

MAR 0.2 0.4 15/10 0.4 24/11 0.4 16/11 0

APR 0.2 0.4 23/9 0.4 1/8 0.4 6/8 0

MAY 0.1 0.3 28/19 0.3 29/18 0.2 10/12 0

JUN 0.2 0.3 28/22 0.3 30/18 0.3 7/11 0

JUL 0.2 0.3 1/7 0.3 1/15 0.3 2/2 0

AUG 0.1 0.3 27/9 0.3 5/18 0.3 24/12 0

SEP 0.2 0.7 25/13 0.4 24/12 0.4 23/20 0

OCT 0.2 0.5 12/10 0.4 8/9 0.4 28/12 0

NOV 0.4 0.8 30/23 0.7 27/2 0.7 5/11 0

DEC 0.4 0.9 8/4 0.9 13/12 0.9 1/10 0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.2 0.9 8/4 0.9 13/12 0.9 1/10 0

* Hour Beginning

2010 ANNUAL SUMMARY

CARBON MONOXIDE (ppm) - EIGHT (8) HOUR AVERAGES

10-7
Location: Incline 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.032 0.051 20/22 0.050 16/12 0.049 17/4 0.0

FEB 0.035 0.052 19/10 0.051 18/10 0.051 23/13 0.0

MAR 0.042 0.060 24/12 0.056 15/14 0.056 23/15 0.0

APR 0.045 0.067 16/9 0.064 10/23 0.064 15/12 0.0

MAY 0.044 0.071 1/23 0.065 2/12 0.063 5/15 0.0

JUN 0.039 0.070 8/22 0.065 8/13 0.063 7/16 0.0

JUL 0.041 0.066 6/17 0.066 27/14 0.066 28/9 0.0

AUG 0.047 0.066 27/0 0.064 20/18 0.064 28/1 0.0

SEP 0.041 0.063 4/9 0.063 7/18 0.063 26/13 0.0

OCT 0.032 0.061 2/11 0.060 1/11 0.051 29/9 0.0

NOV 0.033 0.053 18/21 0.052 19/0 0.048 7/1 0.0

DEC 0.032 0.050 8/7 0.048 19/2 0.048 24/12 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.026 0.071 May 1/23 0.070 Jun 8/22 0.067 Apr 16/9 0.0

* Hour Beginning

2010 ANNUAL SUMMARY

OZONE (ppm) - ONE (1) HOUR AVERAGES

10-8
Location: Lemmon Valley 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.023 0.047 20/2 0.046 17/14 0.046 21/0 0.0

FEB 0.026 0.051 22/15 0.049 12/10 0.049 13/15 0.0

MAR 0.035 0.062 24/20 0.056 30/15 0.055 23/15 0.0

APR 0.042 0.069 16/10 0.064 10/13 0.064 17/14 0.0

MAY 0.043 0.069 5/9 0.067 20/14 0.066 14/15 0.0

JUN 0.041 0.075 8/14 0.072 7/14 0.072 29/10 0.0

JUL 0.043 0.074 30/10 0.073 27/12 0.070 22/15 0.0

AUG 0.046 0.076 5/13 0.075 4/12 0.074 20/14 0.0

SEP 0.036 0.071 25/14 0.071 26/13 0.071 28/14 0.0

OCT 0.028 0.070 2/10 0.067 1/11 0.051 8/15 0.0

NOV 0.032 0.051 18/18 0.048 17/23 0.046 6/23 0.0

DEC 0.026 0.048 19/3 0.047 18/10 0.046 6/2 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.035 0.076 Aug 5/13 0.075 June 8/14 0.075 Aug 4/12 0.0

* Hour Beginning

2010 ANNUAL SUMMARY

OZONE (ppm) - ONE (1) HOUR AVERAGES

10-9
Location: Reno3 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.015 0.048 21/0 0.046 20/23 0.044 17/14 0.0

FEB 0.019 0.047 28/14 0.046 12/11 0.044 16/15 0.0

MAR 0.031 0.061 24/19 0.055 29/01 0.053 28/15 0.0

APR 0.038 0.067 16/10 0.064 10/13 0.064 25/13 0.0

MAY 0.040 0.071 20/13 0.067 2/13 0.065 5/14 0.0

JUN 0.039 0.075 29/10 0.073 24/11 0.070 8/12 0.0

JUL 0.042 0.076 30/11 0.074 22/16 0.074 28/12 0.0

AUG 0.044 0.079 8/11 0.078 15/11 0.077 5/11 0.0

SEP 0.034 0.073 26/15 0.069 4/10 0.066 3/12 0.0

OCT 0.023 0.069 2/11 0.061 1/12 0.052 15/13 0.0

NOV 0.020 0.050 18/13 0.048 7/2 0.047 19/4 0.0

DEC 0.018 0.046 19/3 0.045 18/11 0.044 26/14 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.030 0.079 Aug 8/11 0.078 Aug 15/11 0.077 Aug 5/11 0.0

* Hour Beginning

2010 ANNUAL SUMMARY

OZONE (ppm) - ONE (1) HOUR AVERAGES

10-10
Location: South Reno 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.015 0.048 21/0 0.047 20/23 0.044 17/13 0.0

FEB 0.020 0.047 28/15 0.046 5/13 0.046 12/13 0.0

MAR 0.031 0.062 24/19 0.056 29/2 0.054 28/11 0.0

APR 0.039 0.067 16/10 0.065 10/12 0.065 25/11 0.0

MAY 0.040 0.070 20/13 0.066 14/14 0.066 16/14 0.0

JUN 0.038 0.079 29/10 0.073 8/12 0.071 24/11 0.0

JUL 0.040 0.075 22/16 0.074 30/11 0.072 20/12 0.0

AUG 0.040 0.080 5/12 0.075 20/13 0.074 6/11 0.0

SEP 0.030 0.068 26/13 0.067 3/12 0.067 4/11 0.0

OCT 0.022 0.067 2/10 0.063 1/13 0.050 9/14 0.0

NOV 0.020 0.051 18/21 0.049 19/0 0.047 7/4 0.0

DEC 0.019 0.046 19/3 0.044 18/11 0.042 8/10 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.030 0.080 Aug 5/12 0.079 Jun 29/10 0.075 Jul 22/16 0.0

* Hour Beginning

2010 ANNUAL SUMMARY

OZONE (ppm) - ONE (1) HOUR AVERAGES

10-11
Location: Sparks 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.014 0.045 20/23 0.044 31/14 0.043 17/14 0.0

FEB 0.019 0.048 21/11 0.048 28/14 0.047 12/12 0.0

MAR 0.029 0.063 24/19 0.055 29/1 0.054 28/11 0.0

APR 0.037 0.068 16/10 0.066 10/13 0.066 25/14 0.0

MAY 0.039 0.071 20/13 0.067 16/14 0.066 14/14 0.0

JUN 0.036 0.076 29/10 0.075 8/12 0.075 24/11 0.0

JUL 0.039 0.080 30/11 0.078 28/13 0.076 19/14 0.0

AUG 0.038 0.084 5/12 0.081 6/11 0.080 15/11 0.0

SEP 0.027 0.073 26/15 0.071 4/10 0.069 25/15 0.0

OCT 0.020 0.066 1/11 0.064 2/11 0.053 15/12 0.0

NOV 0.019 0.052 18/21 0.049 19/0 0.047 6/17 0.0

DEC 0.018 0.044 18/11 0.044 19/23 0.043 26/1 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.028 0.084 Aug 5/12 0.081 Aug 6/11 0.080 Jul 30/11 0.0

* Hour Beginning

2010 ANNUAL SUMMARY

OZONE (ppm) - ONE (1) HOUR AVERAGES

10-12
Location: Toll 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.021 0.048 20/23 0.048 21/0 0.045 17/13 0.0

FEB 0.025 0.046 12/14 0.046 21/12 0.045 4/20 0.0

MAR 0.036 0.061 24/19 0.055 29/3 0.055 30/17 0.0

APR 0.041 0.068 16/10 0.065 19/11 0.063 10/12 0.0

MAY 0.041 0.065 14/16 0.065 20/13 0.064 4/21 0.0

JUN 0.039 0.071 8/14 0.070 29/10 0.068 9/22 0.0

JUL 0.044 0.077 22/17 0.075 30/10 0.074 28/12 0.0

AUG 0.048 0.083 20/16 0.081 5/12 0.079 6/11 0.0

SEP 0.040 0.075 16/14 0.071 14/14 0.069 26/13 0.0

OCT 0.029 0.067 2/11 0.066 1/11 0.049 9/12 0.0

NOV 0.025 0.052 18/15 0.050 19/0 0.048 7/2 0.0

DEC 0.024 0.048 8/8 0.047 19/2 0.044 18/11 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.034 0.083 Aug 20/16 0.081 Aug 5/12 0.079 Aug 6/11 0.0

* Hour Beginning

2010 ANNUAL SUMMARY

OZONE (ppm) - ONE (1) HOUR AVERAGES

10-13
Location: Incline 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.031 0.047 20/17 0.046 19/20 0.045 16/22 0.0

FEB 0.035 0.046 18/9 0.046 19/9 0.046 23/9 0.0

MAR 0.042 0.058 24/11 0.055 28/21 0.053 26/9 0.0

APR 0.044 0.061 15/9 0.061 16/8 0.060 10/8 0.0

MAY 0.043 0.062 2/8 0.061 16/8 0.060 5/12 0.0

JUN 0.038 0.067 8/16 0.062 9/16 0.059 7/9 0.0

JUL 0.041 0.063 28/8 0.061 27/10 0.061 30/8 0.0

AUG 0.046 0.060 10/21 0.060 20/13 0.060 27/22 0.0

SEP 0.041 0.060 7/13 0.059 4/8 0.057 26/9 0.0

OCT 0.032 0.056 1/9 0.055 2/8 0.046 28/9 0.0

NOV 0.032 0.051 18/18 0.048 17/23 0.046 6/23 0.0

DEC 0.031 0.047 8/1 0.044 18/21 0.044 25/9 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.038 0.067 Jun 8/16 0.063 Jul 28/8 0.052 May 2/8 0.0

* Hour Beginning

2010 ANNUAL SUMMARY

OZONE (ppm) - EIGHT (8) HOUR AVERAGES

10-14
Location: Lemmon Valley 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.022 0.044 22/8 0.043 13/9 0.042 1/7 0.0

FEB 0.025 0.047 12/9 0.047 21/9 0.045 28/11 0.0

MAR 0.035 0.060 24/12 0.054 28/23 0.053 31/9 0.0

APR 0.042 0.067 16/4 0.061 25/9 0.060 10/10 0.0

MAY 0.042 0.065 5/9 0.063 16/8 0.062 20/10 0.0

JUN 0.041 0.072 8/11 0.066 7/10 0.063 9/15 0.0

JUL 0.043 0.069 27/9 0.066 28/9 0.066 30/8 0.0

AUG 0.046 0.070 20/10 0.067 5/8 0.066 9/9 0.0

SEP 0.035 0.066 26/10 0.062 25/10 0.061 29/9 0.0

OCT 0.027 0.061 2/8 0.058 1/9 0.046 9/10 0.0

NOV 0.025 0.052 18/9 0.048 6/19 0.045 19/0 0.0

DEC 0.025 0.045 18/23 0.043 8/7 0.043 9/4 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.034 0.072 Jun 8/11 0.070 Aug 20/10 0.069 Jul 27/9 0.0

* Hour Beginning

2010 ANNUAL SUMMARY

OZONE (ppm) - EIGHT (8) HOUR AVERAGES

10-15
Location: Reno3 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.014 0.042 20/19 0.041 13/8 0.040 19/7 0.0

FEB 0.019 0.042 12/10 0.041 21/9 0.041 28/10 0.0

MAR 0.031 0.061 24/19 0.055 29/1 0.053 28/15 0.0

APR 0.038 0.061 16/7 0.061 25/10 0.059 10/11 0.0

MAY 0.040 0.063 20/11 0.062 16/9 0.061 5/9 0.0

JUN 0.038 0.067 8/11 0.065 7/10 0.061 15/15 0.0

JUL 0.042 0.067 27/9 0.066 22/10 0.065 19/8 0.0

AUG 0.044 0.071 5/9 0.069 8/9 0.067 20/10 0.0

SEP 0.033 0.064 26/10 0.059 3/12 0.057 4/9 0.0

OCT 0.022 0.058 2/8 0.056 1/12 0.043 6/10 0.0

NOV 0.019 0.047 18/12 0.044 6/11 0.044 17/23 0.0

DEC 0.017 0.043 18/23 0.040 19/13 0.040 26/9 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.030 0.071 Aug 5/9 0.069 Aug 8/9 0.067 Jun 8/11 0.0

* Hour Beginning

2010 ANNUAL SUMMARY

OZONE (ppm) - EIGHT (8) HOUR AVERAGES

10-16
Location: South Reno 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.015 0.045 20/23 0.043 19/22 0.042 17/12 0.0

FEB 0.019 0.043 12/11 0.042 28/10 0.040 15/10 0.0

MAR 0.031 0.059 24/13 0.054 28/18 0.054 29/2 0.0

APR 0.038 0.063 25/10 0.062 10/11 0.061 16/9 0.0

MAY 0.040 0.064 16/9 0.064 20/10 0.062 5/10 0.0

JUN 0.038 0.069 8/11 0.066 7/10 0.064 23/11 0.0

JUL 0.040 0.068 22/10 0.064 23/10 0.064 27/10 0.0

AUG 0.039 0.068 5/9 0.067 20/10 0.065 4/9 0.0

SEP 0.030 0.062 26/10 0.056 3/10 0.056 4/9 0.0

OCT 0.021 0.057 2/9 0.056 1/10 0.043 6/9 0.0

NOV 0.020 0.049 18/10 0.046 17/23 0.044 19/0 0.0

DEC 0.019 0.043 18/23 0.040 26/6 0.040 28/19 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.029 0.069 Jun 8/11 0.068 Jul 22/10 0.068 Aug 5/9 0.0

* Hour Beginning

2010 ANNUAL SUMMARY

OZONE (ppm) - EIGHT (8) HOUR AVERAGES

10-17
Location: Sparks 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.014 0.039 18/19 0.039 19/8 0.037 13/9 0.0

FEB 0.019 0.045 21/8 0.042 12/10 0.042 28/11 0.0

MAR 0.029 0.059 24/13 0.053 28/10 0.050 30/11 0.0

APR 0.037 0.064 25/10 0.062 16/8 0.061 10/11 0.0

MAY 0.038 0.064 20/11 0.063 16/9 0.061 5/9 0.0

JUN 0.036 0.069 8/11 0.065 7/10 0.063 23/10 0.0

JUL 0.038 0.069 28/9 0.068 27/9 0.067 22/10 0.0

AUG 0.038 0.073 5/9 0.068 8/8 0.068 15/8 0.0

SEP 0.027 0.064 26/10 0.059 4/9 0.058 3/11 0.0

OCT 0.019 0.055 1/11 0.055 2/9 0.043 6/9 0.0

NOV 0.019 0.050 18/17 0.044 6/11 0.044 19/1 0.0

DEC 0.017 0.041 26/9 0.039 19/13 0.039 28/16 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.028 0.073 Aug 5/9 0.069 Jun 8/11 0.069 Jul 28/9 0.0

* Hour Beginning

2010 ANNUAL SUMMARY

OZONE (ppm) - EIGHT (8) HOUR AVERAGES

10-18
Location: Toll 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.021 0.046 20/20 0.044 19/19 0.043 17/9 0.0

FEB 0.025 0.044 12/9 0.043 4/18 0.042 21/9 0.0

MAR 0.035 0.058 24/13 0.053 29/2 0.052 28/9 0.0

APR 0.040 0.060 10/10 0.060 16/9 0.060 25/10 0.0

MAY 0.041 0.062 16/9 0.060 5/11 0.060 20/11 0.0

JUN 0.038 0.068 8/11 0.063 9/16 0.062 23/9 0.0

JUL 0.044 0.070 22/10 0.070 27/10 0.070 28/9 0.0

AUG 0.047 0.077 20/11 0.074 5/9 0.069 4/9 0.0

SEP 0.040 0.067 16/10 0.065 7/15 0.062 14/10 0.0

OCT 0.028 0.060 1/10 0.058 2/9 0.043 6/9 0.0

NOV 0.024 0.051 18/14 0.048 17/20 0.046 6/23 0.0

DEC 0.023 0.044 18/22 0.042 8/6 0.041 25/22 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.034 0.077 Aug 20/11 0.074 Aug 5/9 0.070 Jul 22/10 0.0

* Hour Beginning

2010 ANNUAL SUMMARY

OZONE (ppm) - EIGHT (8) HOUR AVERAGES

10-19
Location: Reno3 (designated) 

MONTH AVG. HIGH DATE 2ND HIGH DATE 3RD HIGH DATE 4TH 

JAN 12.9 38.8 5th 16.3 8th 15.6 2nd 14

FEB 7.5 15.0* 1st 9.9 4th 8.7* 28th 8

MAR 4.6 11.1 24th 6.0 21st 5.6 12th 6

APR 5.0 8.6 11th 7.7 26th 6.7 17th 6

MAY 3.3 5.5 5th 5.4 20th 4.7 14th 4

JUN 3.6 6.5 28th 5.0 25th 4.5 22nd 4

JUL 4.9 6.7 22nd 6.3 16th 5.5 10th 5

AUG 5.2 6.8 24th 6.7 6th 5.8 9th 5

SEP 4.6 8.1 29th 6.6 26th 5.5 14th 5

OCT 5.4 7.9 2nd 7.4 14th 7.0 8th 6

NOV 6.5 15.8 25th 14.6 13th 8.4 16th 7

DEC 8.8 24.4 1st 15.0 22nd 11.4 13th 10

ANNUAL 

STATISTICS AVG. HIGH MONTH/ DAY 2ND HIGH MONTH/ DAY 3RD HIGH MONTH/ DAY 4TH 

6.00 38.8 Jan 5th 24.4 Dec 1st 16.3 Jan 8th 15

 Hour Beginning

* Designated Sampler Equipment Malfunction, Used Collocated Sample Value In Place of Missing S

2010 ANNUAL SUMMARY

PM2.5 (g/m3) - 24 HOUR AVERAGES

10-20
Location: Reno3 (collocated) 

MONTH AVG. HIGH DATE 2ND HIGH DATE 3RD HIGH DATE 4TH 

JAN 12.7 38.6 5th 16.2 8th 15.2 2nd 13

FEB 7.5 15.0 22nd 10* 4th 8.7* 28th 8.

MAR 4.5 11.2 24th 6.2 21st 5.6 12th 4

APR 4.9 8.3 11th 7.5 26th 6.8 17th 6

MAY 3.4 5.9 5th 5.3 20th 4.5 14th 4

JUN 3.5 6.3 28th 4.7 25th 4.5 19th 4

JUL 5.0 7.0 25th 6.4 22nd 6.3 16th 5

AUG 5.1 6.5 6th 6.4 24th 5.7 9th 5

SEP 4.6 8.1 29th 6.6 26th 5.5 14th 5

OCT 5.4 7.9 2nd 7.4 14th 7.0 8th 6

NOV 6.6 16.1 25th 14.6 13th 8.7 16th 7

DEC 8.9 24.6 1st 15.2 22nd 11.6 13th 10

ANNUAL 

STATISTICS AVG. HIGH MONTH/ DAY 2ND HIGH MONTH/ DAY 3RD HIGH MONTH/ DAY 4TH 

6.1 38.6 Jan 5th 24.6 Dec 1st 16.2 Jan 8th 16

Hour Beginning

* These values were used to replace missing designated runs

2010 ANNUAL SUMMARY

PM2.5 (g/m3) - 24 HOUR AVERAGES

10-21
Location: Galletti 

MONTH AVG. HIGH DATE 2ND HIGH DATE 3RD HIGH DATE 4TH 

JAN 40 67 14th 54 2nd 40 8th 2

FEB 48 76 1st 66 13th 49 19th 3

MAR 50 74 3rd 65 21st 51 15th 3

APR 56 87 20th 53 8th 52 2nd 4

MAY 22 32 14th 28 20th 24 8th 1

JUN 23 29 25th 28 7th 26 19th 1

JUL 38 50 25th 43 1st 38 13th 3

AUG 35 51 18th 44 24th 36 6th 2

SEP 39 63 29th 50 17th 34 23rd 2

OCT 20 34 29th 29 11th 14 5th 1

NOV 31 65 4th 43 16th 17 22nd 1

DEC 29 49 22nd 44 28th 22 16th 1

ANNUAL 

STATISTICS AVG. HIGH MONTH/ DAY 2ND HIGH MONTH/ DAY 3RD HIGH MONTH/ DAY 4TH 

36 87 Apr 20th 76 Feb 1st 74 Mar 3rd 6

* Hour Beginning

2010 ANNUAL SUMMARY

PM10 (g/m3) - 24 HOUR AVERAGES

10-22
Location: Plumbkit 

MONTH AVG. HIGH DATE 2ND HIGH DATE 3RD HIGH DATE 4TH 

JAN 41 77 2nd 52 14th 47 8th 1

FEB 39 55 1st 52 13th 37 19th 3

MAR 19 35 21st 28 3rd 23 27th 2

APR 21 26 8th 23 2nd 18 20th 1

MAY 11 17 14th 13 8th 10 20th 8 

JUN 14 15 1st 15 25th 14 19th 1

JUL 18 22 13th 20 7th 20 25th 1

AUG 20 24 24th 22 6th 21 18th 1

SEP 22 35 29th 23 17th 21 23rd 1

OCT 13 24 29th 15 11th 10 5th 9 

NOV 21 38 4th 28 16th 16 28th 1

DEC 27 44 22nd 40 28th 21 4th 1

ANNUAL 

STATISTICS AVG. HIGH MONTH/ DAY 2ND HIGH MONTH/ DAY 3RD HIGH MONTH/ DAY 4TH 

23 77 Jan 2nd 55 Feb 1st 52 Jan 14th 5

* Hour Beginning

2010 ANNUAL SUMMARY

PM10 (g/m3) - 24 HOUR AVERAGES

10-23
Location: Reno3 

MONTH AVG. HIGH DATE 2ND HIGH DATE 3RD HIGH DATE 4TH 

JAN 48 142 5th 72 29th 52 2nd 5

FEB 31 55 4th 42 1st 38 13th 3

MAR 19 42 24th 32 12th 24 18th 1

APR 14 22 8th 20 11th 20 26th 1

MAY 10 19 5th 12 8th 12 14th 1

JUN 10 19 28th 13 19th 12 22nd 1

JUL 16 23 16th 21 1st 21 22nd 1

AUG 16 22 24th 19 21st 18 6th 1

SEP 15 28 29th 18 26th 17 2nd 1

OCT 14 25 2nd 20 14th 17 29th 1

NOV 16 30 25th 27 13th 25 4th 2

DEC 27 77 1st 40 28th 39 13th 3

ANNUAL 

STATISTICS AVG. HIGH MONTH/ DAY 2ND HIGH MONTH/ DAY 3RD HIGH MONTH/ DAY 4TH 

20 142 Jan 5th 77 Dec 1st 72 Jan 29th 5

* Hour Beginning

2010 ANNUAL SUMMARY

PM10 (g/m3) - 24 HOUR AVERAGES

10-24
Location: South Reno 

MONTH AVG. HIGH DATE 2ND HIGH DATE 3RD HIGH DATE 4TH 

JAN 23 36 8th 34 2nd 29 14th 1

FEB 26 52 1st 25 13th 23 19th 2

MAR 14 26 21st 18 15th 14 27th 7 

APR 12 16 8th 12 14th 11 2nd 1

MAY 10 15 14th 11 8th 9 20th 8 

JUN 17 35 30th 17 24th 16 18th 1

JUL 18 21 7th 20 19th 18 13th 1

AUG 21 30 24th 22 6th 20 12th 1

SEP 20 27 29th 20 17th 19 11th 1

OCT 12 21 29th 15 11th 10 5th 8 

NOV 16 26 4th 24 28th 18 16th 7 

DEC 18 29 22nd 29 28th 15 16th 1

ANNUAL 

STATISTICS AVG. HIGH MONTH/ DAY 2ND HIGH MONTH/ DAY 3RD HIGH MONTH/ DAY 4TH 

17 52 Feb 1st 36 Jan 8th 35 Jun 30th 3

* Hour Beginning

2010 ANNUAL SUMMARY

PM10 (g/m3) - 24 HOUR AVERAGES

10-25
Location: Sparks (designated) 

MONTH AVG. HIGH DATE 2ND HIGH DATE 3RD HIGH DATE 4TH 

JAN 26 43 14th 40 2nd 27 8th 1

FEB 31 46 1st 46 13th 29 19th 2

MAR 21 34 15th 27 21st 18 3rd 1

APR 20 27 26th 21 8th 19 2nd 1

MAY 13 21 14th 15 8th 12 20th 9 

JUN 13 17 25th 15 13th 13 19th 1

JUL 19 24 25th 22 7th 19 19th 1

AUG 20 28 24th 25 6th 20 18th 1

SEP 27 42 29th 30 17th 24 23rd 2

OCT 15 25 29th 17 11th 11 17th 1

NOV 22 37 4th 33 16th 24 28th 1

DEC 23 55 22nd 27 28th 12 4th 1

ANNUAL 

STATISTICS AVG. HIGH MONTH/ DAY 2ND HIGH MONTH/ DAY 3RD HIGH MONTH/ DAY 4TH 

21 55 Dec 22nd 46 Feb 1st 46 Feb 13th 4

* Hour Beginning

2010 ANNUAL SUMMARY

PM10 (g/m3) - 24 HOUR AVERAGES

10-26
Location: Sparks (collocated) 

MONTH AVG. HIGH DATE 2ND HIGH DATE 3RD HIGH DATE 4TH 

JAN 26 43 14th 39 2nd 28 8th 1

FEB 32 48 1st 47 13th 29 19th 1

MAR 21 35 15th 27 21st 17 3rd 1

APR 21 27 26th 21 8th 19 2nd 1

MAY 13 21 14th 14 8th 13 20th 1

JUN 14 16 25th 15 13th 15 19th 1

JUL 20 24 7th 23 25th 21 13th 1

AUG 20 29 24th 23 6th 19 12th 1

SEP 28 44 29th 31 17th 25 23rd 2

OCT 16 27 29th 18 11th 12 17th 1

NOV 23 35 4th 34 16th 26 28th 1

DEC 22 54 22nd 26 28th 12 16th 1

ANNUAL 

STATISTICS AVG. HIGH MONTH/ DAY 2ND HIGH MONTH/ DAY 3RD HIGH MONTH/ DAY 4TH 

21 54 Dec 22nd 48 Feb 1st 47 Feb 13th 4

* Hour Beginning

2010 ANNUAL SUMMARY

PM10 (g/m3) - 24 HOUR AVERAGES

10-27
Location: Toll 

MONTH AVG. HIGH DATE 2ND HIGH DATE 3RD HIGH DATE 4TH 

JAN 18 30 2nd 30 8th 15 14th 1

FEB 20 32 1st 23 19th 19 13th 1

MAR 16 33 21st 13 3rd 12 15th 1

APR 14 17 8th 13 2nd 13 14th 1

MAY 9 14 14th 11 8th 9 20th 6 

JUN 15 19 19th 19 25th 15 7th 1

JUL 22 26 7th 26 19th 24 1st 2

AUG 23 26 6th 26 24th 24 18th 2

SEP 23 34 29th 27 17th 22 23rd 1

OCT 12 18 11th 14 29th 10 23rd 9 

NOV 14 28 4th 22 16th 9 28th 7 

DEC 13 22 28th 15 16th 14 22nd 8 

ANNUAL 

STATISTICS AVG. HIGH MONTH/ DAY 2ND HIGH MONTH/ DAY 3RD HIGH MONTH/ DAY 4TH 

17 34 Sept 29th 33 Mar 21st 32 Feb 1st 3

* Hour Beginning

2010 ANNUAL SUMMARY

PM10 (g/m3) - 24 HOUR AVERAGES

10-28
Location: Reno3 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.027 0.076 6/9 0.075 5/11 0.057 4/11 0.0

FEB 0.022 0.058 23/9 0.052 22/19 0.050 4/11 0.0

MAR 0.015 0.049 12/8 0.045 23/5 0.044 10/21 0.0

APR 0.013 0.048 13/6 0.045 7/7 0.044 8/7 0.0

MAY 0.010 0.044 6/23 0.042 7/0 0.041 21/6 0.0

JUN 0.008 0.034 30/7 0.031 15/6 0.030 19/6 0.0

JUL 0.010 0.039 13/6 0.039 21/5 0.039 21/5 0.0

AUG 0.012 0.053 26/7 0.046 23/21 0.045 18/0 0.0

SEP 0.016 0.055 24/18 0.053 27/18 0.052 29/18 0.0

OCT 0.018 0.049 28/19 0.046 13/18 0.045 1/2 0.0

NOV 0.022 0.056 17/16 0.053 26/18 0.051 4/16 0.0

DEC 0.022 0.081 1/11 0.057 13/12 0.049 23/10 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.016 0.081 Dec 1/11 0.076 Jan 6/9 0.075 Jan 5/11 0.0

* Hour Beginning

2010 ANNUAL SUMMARY

NO2 (ppm) - HOURLY AVERAGES

10-29
Location: Reno3 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.032 0.303 6/9 0.270 5/8 0.213 4/8 0.1

FEB 0.015 0.139 3/7 0.138 4/7 0.135 23/9 0.1

MAR 0.006 0.105 12/8 0.063 16/7 0.050 23/7 0.0

APR 0.005 0.121 8/7 0.081 7/7 0.078 23/8 0.0

MAY 0.003 0.057 3/6 0.047 13/7 0.042 7/7 0.0

JUN 0.003 0.046 6/6 0.036 30/7 0.033 14/6 0.0

JUL 0.003 0.064 13/6 0.048 21/5 0.027 16/5 0.0

AUG 0.003 0.055 26/7 0.049 23/21 0.039 27/7 0.0

SEP 0.005 0.060 2/8 0.052 24/19 0.048 20/7 0.0

OCT 0.010 0.143 21/7 0.138 22/7 0.124 19/8 0.0

NOV 0.020 0.163 17/20 0.159 12/8 0.124 30/22 0.1

DEC 0.022 0.247 1/9 0.208 23/7 0.171 2/8 0.1

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.011 0.303 Jan 6/9 0.270 Jan 5/8 0.247 Dec 1/9 0.2

* Hour Beginning

2010 ANNUAL SUMMARY

NO (ppm) - HOURLY AVERAGES

10-30
Location: Reno3 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.059 0.379 6/9 0.329 5/8 0.263 4/8 0.2

FEB 0.037 0.194 23/9 0.182 3/7 0.179 4/7 0.1

MAR 0.021 0.154 12/8 0.094 16/7 0.091 14/0 0.0

APR 0.018 0.165 8/7 0.126 7/7 0.119 23/8 0.1

MAY 0.012 0.090 3/5 0.083 13/7 0.080 21/6 0.0

JUN 0.011 0.070 30/7 0.067 6/6 0.062 14/6 0.0

JUL 0.013 0.103 13/6 0.086 21/5 0.061 16/5 0.0

AUG 0.015 0.108 26/7 0.094 23/21 0.083 27/8 0.0

SEP 0.020 0.106 24/19 0.100 2/8 0.083 14/7 0.0

OCT 0.027 0.182 21/7 0.178 22/7 0.163 19/8 0.1

NOV 0.043 0.216 17/20 0.201 12/8 0.172 30/22 0.1

DEC 0.044 0.312 1/9 0.247 23/7 0.218 2/8 0.2

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.027 0.379 Jan 6/9 0.329 Jan 5/8 0.312 Dec 1/9 0.2

* Hour Beginning

2010 ANNUAL SUMMARY

NOx (ppm) - HOURLY AVERAGES

10-31
Washoe County

Ambient Air Monitoring Data

(2009)
Pollutant Averaging Period Exceedance Dates

PM10 24-hour none

PM2.5 24-hour Dec 9, 15, and 18.

O3 8-hour none

1-hour none

8-hour none

NO2 1-hour none

1-hour

24-hour

3-hour

3-month

quarterly

Pb n/a - Pb was not monitored in 2009.

Exceedances (2009)

CO

SO2 n/a - SO2 was not monitored in 2009.

09-1
Location: Galletti 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.8 2.6 1/8 2.3 11/6 1.9 14/9 1

FEB 0.4 1.7 1/2 1.4 4/10 1.3 5/8 1

MAR 0.3 1.1 8/5 1.1 14/7 1.0 12/8 1

APR 0.2 0.6 7/8 0.6 19/3 0.6 17/6 0

MAY 0.1 0.5 18/8 0.3 16/4 0.3 4/7 0

JUN 0.2 0.5 23/7 0.4 24/9 0.4 28/3 0

JUL 0.2 0.5 1/7 0.5 7/7 0.4 2/9 0

AUG 0.2 0.7 26/9 0.7 20/9 0.7 31/8 0

SEP 0.4 1.2 27/2 1.1 26/2 1.1 28/9 1

OCT 0.4 1.3 8/8 1.1 11/7 1.1 22/6 1

NOV 0.5 1.8 17/8 1.3 1/7 1.3 27/1 1

DEC 0.7 1.9 19/3 1.8 18/3 1.7 1/8 1

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.4 2.6 Jan 1/8 2.3 Jan 11/6 1.9 Jan 14/9 1

* Hour Beginning

2009 ANNUAL SUMMARY

CARBON MONOXIDE (ppm) - EIGHT (8) HOUR AVERAGES

09-2
Location: Lemmon Valley 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.6 1.5 11/2 1.4 14/1 1.4 15/1 1

FEB 0.4 1.2 5/1 1.1 4/8 1.0 21/3 1

MAR 0.3 0.9 12/7 0.8 11/7 0.8 8/6 0

APR 0.2 0.6 6/6 0.6 4/6 0.6 7/6 0

MAY 0.1 0.3 17/3 0.3 9/5 0.3 16/2 0

JUN 0.1 0.3 24/5 0.3 29/6 0.2 30/10 0

JUL 0.2 0.3 22/11 0.3 17/9 0.3 14/5 0

AUG 0.2 0.5 12/7 0.4 9/3 0.4 20/9 0

SEP 0.2 0.4 26/2 0.4 28/2 0.3 22/7 0

OCT 0.3 0.9 29/2 0.8 31/2 0.6 26/8 0

NOV 0.5 1.1 25/7 1.1 30/3 1.1 26/2 1

DEC 0.7 1.7 10/0 1.5 9/9 1.3 18/9 1

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.3 1.7 Dec 10/0 1.5 Jan 11/2 1.5 Dec 9/9 1

* Hour Beginning

2009 ANNUAL SUMMARY

CARBON MONOXIDE (ppm) - EIGHT (8) HOUR AVERAGES

09-3
Location: Reno3 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.4 2.2 1/7 1.6 28/1 1.5 11/8 1

FEB 0.2 0.6 5/11 0.6 4/12 0.5 1/1 0

MAR 0.1 0.7 14/9 0.6 8/5 0.4 25/11 0

APR 0.1 0.2 11/7 0.2 19/0 0.2 17/23 0

MAY 0.1 0.2 4/8 0.2 18/8 0.2 1/7 0

JUN 0.1 0.1 9/11 0.1 17/10 0.1 1/8 0

JUL 0.1 0.1 29/9 0.1 14/14 0.1 2/13 0

AUG 0.1 0.3 8/1 0.3 9/1 0.3 17/3 0

SEP 0.1 0.5 28/10 0.4 27/0 0.4 13/7 0

OCT 0.1 0.7 24/0 0.6 11/7 0.5 12/10 0

NOV 0.2 1.2 27/1 1.0 17/9 0.7 29/7 0

DEC 0.6 2.1 15/14 2.0 17/0 1.8 9/13 1

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.2 2.2 Jan 1/7 2.1 Dec 15/14 2.0 Dec 17/0 1

* Hour Beginning

2009 ANNUAL SUMMARY

CARBON MONOXIDE (ppm) - EIGHT (8) HOUR AVERAGES

09-4
Location: South Reno 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.7 1.5 21/22 1.5 23/0 1.4 22/10 1

FEB 0.4 0.9 5/10 0.9 8/7 0.8 6/4 0

MAR 0.2 0.5 31/10 0.5 24/8 0.5 27/8 0

APR 0.3 0.5 22/8 0.5 5/7 0.5 7/10 0

MAY 0.3 0.5 30/2 0.5 18/9 0.5 27/9 0

JUN 0.4 0.6 4/1 0.5 9/8 0.5 17/8 0

JUL 0.3 0.5 16/8 0.5 1/1 0.5 17/9 0

AUG 0.2 0.4 17/7 0.3 9/2 0.3 10/10 0

SEP 0.2 0.5 28/11 0.5 27/0 0.4 25/23 0

OCT 0.3 0.6 30/8 0.6 26/12 0.6 22/8 0

NOV 0.4 1.0 17/7 1.0 27/2 0.9 20/2 0

DEC 0.8 1.6 15/11 1.5 10/12 1.4 18/10 1

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.4 1.6 Dec 15/11 1.5 Jan 21/22 1.5 Jan 23/0 1

* Hour Beginning

2009 ANNUAL SUMMARY

CARBON MONOXIDE (ppm) - EIGHT (8) HOUR AVERAGES

09-5
Location: Sparks 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 1.0 3.3 1/1 2.9 11/3 2.5 15/0 2

FEB 0.6 2.2 1/4 2.1 5/1 1.8 3/9 1

MAR 0.4 1.6 13/10 1.4 11/9 1.4 12/8 1

APR 0.3 1.0 6/8 0.9 7/8 0.9 17/7 0

MAY 0.2 0.7 17/2 0.5 9/5 0.5 27/7 0

JUN 0.2 0.6 24/6 0.5 28/3 0.4 29/7 0

JUL 0.2 0.5 30/2 0.5 1/6 0.5 31/8 0

AUG 0.3 1.1 9/3 0.7 20/8 0.7 17/7 0

SEP 0.4 1.3 27/1 1.1 26/1 1.0 12/1 1

OCT 0.5 1.7 31/1 1.6 24/1 1.4 29/7 1

NOV 0.8 2.2 26/4 2.2 30/23 2.0 17/8 2

DEC 0.9 2.4 1/1 2.1 2/2 2.1 10/1 2

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.5 3.3 Jan 1/1 2.9 Jan 11/3 2.5 Jan 15/0 2

* Hour Beginning

2009 ANNUAL SUMMARY

CARBON MONOXIDE (ppm) - EIGHT (8) HOUR AVERAGES

09-6
Location: Toll 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.6 1.2 22/23 1.0 28/11 1.0 16/13 1

FEB 0.6 1.5 3/7 1.4 4/7 1.3 6/7 1

MAR 0.2 0.5 1/3 0.4 31/11 0.4 11/11 0

APR 0.4 0.7 20/9 0.7 30/8 0.7 16/10 0

MAY 0.4 0.7 1/9 0.6 14/23 0.6 15/8 0

JUN 0.3 0.5 15/22 0.5 9/7 0.5 17/7 0

JUL 0.3 0.7 23/22 0.5 18/3 0.5 15/11 0

AUG 0.4 0.6 17/12 0.5 20/12 0.5 10/10 0

SEP 0.4 0.8 26/14 0.7 28/9 0.7 25/12 0

OCT 0.2 0.6 9/10 0.5 12/11 0.5 5/11 0

NOV 0.2 0.6 26/23 0.5 16/23 0.5 11/7 0

DEC 0.6 1.3 15/10 1.2 10/12 1.2 11/4 1

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.4 1.5 Feb 3/7 1.4 Feb 4/7 1.3 Feb 6/7 1

* Hour Beginning

2009 ANNUAL SUMMARY

CARBON MONOXIDE (ppm) - EIGHT (8) HOUR AVERAGES

09-7
Location: Incline 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.028 0.048 27/14 0.045 5/18 0.045 11/13 0.0

FEB 0.034 0.052 27/13 0.049 13/4 0.049 26/22 0.0

MAR 0.041 0.069 29/8 0.065 26/21 0.062 7/14 0.0

APR 0.045 0.071 22/21 0.066 3/14 0.066 16/15 0.0

MAY 0.040 0.067 12/17 0.062 23/17 0.062 24/9 0.0

JUN 0.038 0.070 24/17 0.068 26/9 0.063 28/14 0.0

JUL 0.042 0.066 11/12 0.061 10/10 0.060 2/18 0.0

AUG 0.042 0.073 12/13 0.072 11/15 0.068 23/2 0.0

SEP 0.040 0.067 19/18 0.063 29/1 0.062 13/10 0.0

OCT 0.032 0.058 12/9 0.054 3/17 0.052 2/17 0.0

NOV 0.035 0.053 20/3 0.053 21/14 0.052 9/23 0.0

DEC 0.033 0.050 24/22 0.050 25/13 0.048 6/20 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.025 0.073 Aug 12/13 0.072 Aug 11/15 0.071 Apr 22/21 0.0

* Hour Beginning

2009 ANNUAL SUMMARY

OZONE (ppm) - ONE (1) HOUR AVERAGES

09-8
Location: Lemmon Valley 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.017 0.044 11/13 0.044 31/14 0.043 28/13 0.0

FEB 0.030 0.055 24/12 0.051 26/22 0.051 27/14 0.0

MAR 0.037 0.071 26/16 0.064 27/13 0.06 17/12 0.0

APR 0.039 0.071 22/21 0.062 6/13 0.062 28/11 0.0

MAY 0.041 0.074 24/8 0.069 12/11 0.065 23/22 0.0

JUN 0.038 0.068 25/10 0.068 30/11 0.066 27/14 0.0

JUL 0.042 0.069 10/11 0.069 24/11 0.067 16/10 0.0

AUG 0.039 0.076 11/20 0.072 28/15 0.068 10/13 0.0

SEP 0.031 0.066 17/13 0.064 19/8 0.062 16/14 0.0

OCT 0.024 0.052 12/11 0.051 3/11 0.049 2/15 0.0

NOV 0.023 0.052 11/13 0.050 20/9 0.048 9/14 0.0

DEC 0.020 0.051 8/14 0.045 15/13 0.044 31/23 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.032 0.076 Aug 11/20 0.074 May 24/8 0.072 Aug 28/15 0.0

* Hour Beginning

2009 ANNUAL SUMMARY

OZONE (ppm) - ONE (1) HOUR AVERAGES

09-9
Location: Reno3 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.010 0.039 28/14 0.038 25/3 0.037 2/13 0.0

FEB 0.023 0.048 27/13 0.047 22/2 0.047 24/12 0.0

MAR 0.032 0.066 26/17 0.054 17/12 0.053 7/12 0.0

APR 0.038 0.071 22/21 0.062 23/0 0.061 6/14 0.0

MAY 0.040 0.068 12/12 0.067 24/9 0.065 11/23 0.0

JUN 0.037 0.072 29/11 0.070 25/11 0.070 26/12 0.0

JUL 0.042 0.076 27/14 0.074 17/13 0.073 15/11 0.0

AUG 0.039 0.076 11/19 0.075 2/10 0.074 28/12 0.0

SEP 0.029 0.069 17/15 0.066 16/15 0.062 19/9 0.0

OCT 0.020 0.052 3/13 0.051 12/12 0.049 2/16 0.0

NOV 0.017 0.051 20/10 0.050 11/13 0.047 18/0 0.0

DEC 0.009 0.041 5/1 0.041 22/2 0.040 30/3 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.028 0.076 Jul 27/14 0.076 Aug 11/19 0.075 Aug 2/10 0.0

* Hour Beginning

2009 ANNUAL SUMMARY

OZONE (ppm) - ONE (1) HOUR AVERAGES

09-10
Location: South Reno 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.010 0.038 2/13 0.037 3/13 0.037 28/13 0.0

FEB 0.023 0.051 27/13 0.049 26/13 0.048 24/8 0.0

MAR 0.031 0.068 26/17 0.058 27/13 0.057 7/13 0.0

APR 0.037 0.065 16/14 0.065 22/21 0.063 17/12 0.0

MAY 0.037 0.065 12/13 0.064 24/9 0.062 26/15 0.0

JUN 0.033 0.069 26/13 0.069 27/16 0.069 29/11 0.0

JUL 0.036 0.072 15/12 0.072 27/15 0.071 17/11 0.0

AUG 0.033 0.074 12/14 0.069 11/19 0.066 2/12 0.0

SEP 0.027 0.070 17/15 0.065 16/16 0.060 18/14 0.0

OCT 0.020 0.055 12/12 0.051 3/10 0.050 17/13 0.0

NOV 0.016 0.053 20/12 0.051 11/13 0.048 17/20 0.0

DEC 0.008 0.039 22/2 0.038 5/11 0.038 30/4 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.026 0.074 Aug 12/14 0.072 Jul 15/12 0.072 Jul 27/15 0.0

* Hour Beginning

2009 ANNUAL SUMMARY

OZONE (ppm) - ONE (1) HOUR AVERAGES

09-11
Location: Sparks 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.010 0.039 25/3 0.039 28/15 0.038 31/15 0.0

FEB 0.021 0.049 24/12 0.048 26/21 0.048 27/14 0.0

MAR 0.030 0.069 26/16 0.057 28/13 0.057 30/16 0.0

APR 0.036 0.072 22/21 0.063 16/14 0.062 6/14 0.0

MAY 0.036 0.070 24/9 0.068 12/13 0.066 16/17 0.0

JUN 0.035 0.073 26/12 0.073 29/11 0.072 25/11 0.0

JUL 0.036 0.072 15/12 0.071 27/14 0.071 30/14 0.0

AUG 0.033 0.076 2/11 0.076 12/14 0.074 11/21 0.0

SEP 0.025 0.068 16/15 0.068 17/15 0.062 19/9 0.0

OCT 0.019 0.053 12/12 0.051 3/10 0.050 7/15 0.0

NOV 0.016 0.051 11/13 0.049 20/12 0.047 18/0 0.0

DEC 0.010 0.041 22/2 0.040 5/2 0.039 30/4 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.026 0.076 Aug 2/11 0.076 Aug 12/14 0.074 Aug 11/21 0.0

* Hour Beginning

2009 ANNUAL SUMMARY

OZONE (ppm) - ONE (1) HOUR AVERAGES

09-12
Location: Toll 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.016 0.039 2/13 0.039 24/21 0.038 25/2 0.0

FEB 0.029 0.050 26/23 0.049 22/1 0.049 24/11 0.0

MAR 0.035 0.070 26/17 0.062 29/5 0.060 27/13 0.0

APR 0.043 0.076 22/21 0.066 16/14 0.064 6/16 0.0

MAY 0.043 0.071 12/13 0.069 24/9 0.065 26/15 0.0

JUN 0.036 0.067 26/12 0.066 18/15 0.065 27/16 0.0

JUL 0.040 0.069 16/11 0.066 27/15 0.065 13/13 0.0

AUG 0.037 0.075 12/13 0.071 11/18 0.069 28/15 0.0

SEP 0.034 0.066 17/15 0.065 19/7 0.061 18/21 0.0

OCT 0.026 0.051 3/9 0.049 12/18 0.047 2/14 0.0

NOV 0.024 0.053 20/12 0.052 11/12 0.048 18/1 0.0

DEC 0.015 0.044 13/2 0.043 30/01 0.042 15/12 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.031 0.076 Apr 22/21 0.075 Aug 12/13 0.071 May 12/13 0.0

* Hour Beginning

2009 ANNUAL SUMMARY

OZONE (ppm) - ONE (1) HOUR AVERAGES

09-13
Location: Incline 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.027 0.042 5/12 0.041 27/9 0.038 2/23 0.0

FEB 0.033 0.049 27/9 0.046 15/3 0.045 26/16 0.0

MAR 0.041 0.060 29/7 0.059 26/15 0.058 7/9 0.0

APR 0.044 0.061 22/15 0.060 16/10 0.060 17/10 0.0

MAY 0.040 0.062 12/11 0.058 23/10 0.058 24/8 0.0

JUN 0.038 0.063 24/12 0.062 26/8 0.060 29/9 0.0

JUL 0.041 0.059 10/8 0.059 11/8 0.055 7/20 0.0

AUG 0.041 0.068 11/11 0.064 12/7 0.060 22/23 0.0

SEP 0.040 0.064 19/16 0.060 19/5 0.056 20/8 0.0

OCT 0.032 0.052 3/10 0.051 12/8 0.049 12/16 0.0

NOV 0.034 0.051 11/9 0.049 9/19 0.049 20/2 0.0

DEC 0.033 0.048 25/8 0.046 24/18 0.045 15/20 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.037 0.068 Aug 11/11 0.064 Aug 12/7 0.064 Sep 19/16 0.0

* Hour Beginning

2009 ANNUAL SUMMARY

OZONE (ppm) - EIGHT (8) HOUR AVERAGES

09-14
Location: Lemmon Valley 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.016 0.039 28/10 0.038 2/7 0.037 3/10 0.0

FEB 0.029 0.051 24/6 0.048 26/9 0.048 27/10 0.0

MAR 0.036 0.063 26/11 0.057 27/9 0.056 17/9 0.0

APR 0.039 0.064 22/16 0.060 28/10 0.059 6/10 0.0

MAY 0.040 0.066 12/9 0.065 24/7 0.059 11/11 0.0

JUN 0.038 0.063 29/8 0.062 24/10 0.062 25/7 0.0

JUL 0.041 0.065 10/9 0.062 17/8 0.060 24/8 0.0

AUG 0.038 0.072 11/14 0.065 28/10 0.064 27/9 0.0

SEP 0.031 0.059 19/7 0.057 17/9 0.056 18/14 0.0

OCT 0.024 0.050 3/8 0.049 12/9 0.048 12/17 0.0

NOV 0.022 0.048 11/9 0.048 20/5 0.046 17/17 0.0

DEC 0.019 0.043 15/8 0.042 22/4 0.041 31/17 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.031 0.072 Aug 11/14 0.066 May 12/9 0.065 May 24/7 0.0

* Hour Beginning

2009 ANNUAL SUMMARY

OZONE (ppm) - EIGHT (8) HOUR AVERAGES

09-15
Location: Reno3 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.009 0.035 24/23 0.035 28/9 0.033 2/8 0.0

FEB 0.023 0.045 27/8 0.044 24/9 0.043 26/7 0.0

MAR 0.031 0.056 26/11 0.051 28/11 0.051 29/8 0.0

APR 0.037 0.065 22/18 0.058 28/9 0.057 6/10 0.0

MAY 0.040 0.064 12/10 0.061 24/8 0.060 16/11 0.0

JUN 0.037 0.062 24/10 0.062 25/8 0.062 29/9 0.0

JUL 0.042 0.065 10/10 0.064 17/9 0.062 27/8 0.0

AUG 0.038 0.073 11/15 0.067 2/9 0.064 28/10 0.0

SEP 0.029 0.058 17/10 0.058 19/9 0.056 16/12 0.0

OCT 0.020 0.049 3/9 0.047 12/11 0.044 11/10 0.0

NOV 0.017 0.048 20/7 0.043 17/19 0.042 11/12 0.0

DEC 0.008 0.039 4/23 0.038 22/0 0.035 22/8 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.028 0.073 Aug 11/15 0.067 Aug 2/9 0.065 Apr 22/18 0.0

* Hour Beginning

2009 ANNUAL SUMMARY

OZONE (ppm) - EIGHT (8) HOUR AVERAGES

09-16
Location: South Reno 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.010 0.035 3/10 0.033 2/6 0.033 24/19 0.0

FEB 0.022 0.047 24/5 0.047 26/7 0.046 27/9 0.0

MAR 0.031 0.058 26/11 0.052 27/10 0.051 14/12 0.0

APR 0.037 0.060 16/11 0.059 6/10 0.058 22/15 0.0

MAY 0.037 0.065 12/13 0.064 24/9 0.062 26/15 0.0

JUN 0.033 0.061 26/10 0.060 29/9 0.059 18/10 0.0

JUL 0.036 0.062 27/10 0.061 17/9 0.059 9/9 0.0

AUG 0.033 0.066 11/14 0.063 2/9 0.061 12/8 0.0

SEP 0.026 0.061 17/9 0.058 19/9 0.056 16/11 0.0

OCT 0.020 0.049 3/9 0.047 12/11 0.045 2/12 0.0

NOV 0.015 0.048 20/5 0.045 17/18 0.041 11/12 0.0

DEC 0.008 0.039 22/2 0.038 5/11 0.038 30/4 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.026 0.066 Aug 11/14 0.065 May 12/13 0.063 Aug 2/9 0.0

* Hour Beginning

2009 ANNUAL SUMMARY

OZONE (ppm) - EIGHT (8) HOUR AVERAGES

09-17
Location: Sparks 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.010 0.035 24/23 0.034 3/10 0.031 2/8 0.0

FEB 0.021 0.045 27/10 0.043 26/14 0.042 22/10 0.0

MAR 0.030 0.060 26/11 0.052 28/11 0.052 29/8 0.0

APR 0.036 0.060 16/11 0.060 22/15 0.059 6/10 0.0

MAY 0.035 0.064 12/9 0.063 24/8 0.060 16/11 0.0

JUN 0.034 0.064 25/8 0.063 24/10 0.063 29/9 0.0

JUL 0.035 0.063 17/9 0.061 9/8 0.060 10/8 0.0

AUG 0.033 0.069 11/15 0.068 2/8 0.062 27/10 0.0

SEP 0.024 0.058 17/10 0.058 19/9 0.055 16/10 0.0

OCT 0.018 0.048 3/9 0.045 12/11 0.043 11/11 0.0

NOV 0.015 0.045 20/5 0.038 17/20 0.038 22/9 0.0

DEC 0.009 0.039 22/0 0.037 5/1 0.037 22/8 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.025 0.069 Aug 11/15 0.068 Aug 2/8 0.064 May 12/9 0.0

* Hour Beginning

2009 ANNUAL SUMMARY

OZONE (ppm) - EIGHT (8) HOUR AVERAGES

09-18
Location: Toll 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.016 0.037 24/20 0.035 2/7 0.034 3/9 0.0

FEB 0.029 0.045 21/22 0.044 22/9 0.044 24/4 0.0

MAR 0.035 0.061 26/11 0.054 27/10 0.054 28/10 0.0

APR 0.043 0.067 22/17 0.061 28/9 0.060 6/10 0.0

MAY 0.042 0.067 12/9 0.063 24/7 0.061 19/7 0.0

JUN 0.036 0.061 26/10 0.058 18/11 0.058 25/8 0.0

JUL 0.039 0.061 27/10 0.059 9/9 0.059 13/9 0.0

AUG 0.037 0.075 12/13 0.071 11/18 0.069 28/15 0.0

SEP 0.033 0.061 19/6 0.059 17/10 0.059 19/14 0.0

OCT 0.026 0.050 3/9 0.047 12/13 0.045 2/12 0.0

NOV 0.024 0.049 11/11 0.048 20/6 0.044 17/18 0.0

DEC 0.014 0.038 15/11 0.037 21/9 0.037 22/1 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.031 0.075 Aug 12/13 0.071 Aug 11/18 0.069 Aug 28/15 0.0

* Hour Beginning

2009 ANNUAL SUMMARY

OZONE (ppm) - EIGHT (8) HOUR AVERAGES

09-19
Location: Reno3 (designated) 

MONTH AVG. HIGH DATE 2ND HIGH DATE 3RD HIGH DATE 4TH 

JAN 13.5 21.4 1st 19.9 22nd 17.3 28th 15

FEB 5.1 11.0 3rd 7.7 21st 6.6 18th 4

MAR 4.7 7.3 14th 6.8 17th 6.2 20th 6

APR 4.8 6.1 4th 5.9 7th 5.9 13th 5

MAY 5.4 7.9 16th 7.2 19th 6.2 22nd 6

JUN 5.4 6.9 27th 6.6 12th 6.6 30th 6

JUL 5.3 7.2 30th 6.5 18th 6.3 15th 6

AUG 8.6 17.9 17th 12.6 8th 11.2 11th 9

SEP 5.3 8.0 28th 5.9 19th 5.9 16th 5

OCT 5.1 7.8 31st 7.4 10th 6.9 22nd 5

NOV 8.0 13.3 30th 12.6 24th 11.7 9th 9

DEC 22.8 52.6 9th 41.2 18th 40.5 15th 24

ANNUAL 

STATISTICS AVG. HIGH MONTH/ DAY 2ND HIGH MONTH/ DAY 3RD HIGH MONTH/ DAY 4TH 

10.20 52.6 Dec 9th 41.2 Dec 18th 40.5 Dec 15th 24

* Hour Beginning

2009 ANNUAL SUMMARY

PM2.5 (g/m3) - 24 HOUR AVERAGES

09-20
Location: Reno3 (collocated) 

MONTH AVG. HIGH DATE 2ND HIGH DATE 3RD HIGH DATE 4TH 

JAN 13.1 21.1 1st 19.4 22nd 15.1 31st 14

FEB 6.0 16.8 3rd 7.9 21st 6.5 18th 5

MAR 4.7 7.3 14th 6.9 17th 6.2 20th 5

APR 4.7 6.0 13th 5.9 4th 5.9 7th 5

MAY 5.4 8.0 16th 7.0 19th 6.2 22nd 6

JUN 5.3 7.0 27th 6.8 30th 6.4 12th 6

JUL 5.2 6.9 30th 6.7 18th 6.3 15th 6

AUG 8.8 18.3 17th 13.2 8th 11.7 11th 9

SEP 5.4 8.6 28th 6.0 10th 6.0 25th 5

OCT 5.0 7.7 31st 6.8 22nd 6.7 10th 5

NOV 7.5 13.3 30th 12.6 24th 9.4 3rd 8

DEC 22.8 53.4 9th 41.1 18th 40.2 15th 24

ANNUAL 

STATISTICS AVG. HIGH MONTH/ DAY 2ND HIGH MONTH/ DAY 3RD HIGH MONTH/ DAY 4TH 

9.90 53.40 Dec 9th 41.10 Dec 18th 40.20 Dec 15th 24

* Hour Beginning

2009 ANNUAL SUMMARY

PM2.5 (g/m3) - 24 HOUR AVERAGES

09-21
Location: Galletti 

MONTH AVG. HIGH DATE 2ND HIGH DATE 3RD HIGH DATE 4TH 

JAN 62 91 7th 88 1st 67 13th 6

FEB 30 38 12th 29 24th 23 6th N

MAR 32 50 14th 48 20th 30 8th 2

APR 29 64 7th 30 13th 22 19th 1

MAY 21 45 19th 18 13th 16 5th 1

JUN 28 45 30th 32 24th 26 18th 8 

JUL 22 30 24th 27 30th 23 18th 1

AUG 39 50 11th 41 17th 33 5th 3

SEP 48 71 28th 50 22nd 42 16th 4

OCT 23 32 10th 31 22nd 24 16th 1

NOV 29 45 3rd 44 9th 21 15th 2

DEC 49 77 15th 75 9th 42 3rd 2

ANNUAL 

STATISTICS AVG. HIGH MONTH/ DAY 2ND HIGH MONTH/ DAY 3RD HIGH MONTH/ DAY 4TH 

33 91 Jan 7th 88 Jan 1st 77 Dec 15th 7

* Hour Beginning

2009 ANNUAL SUMMARY

PM10 (g/m3) - 24 HOUR AVERAGES

09-22
Location: Plumbkit 

MONTH AVG. HIGH DATE 2ND HIGH DATE 3RD HIGH DATE 4TH 

JAN 57 93 1st 75 7th 61 13th 5

FEB 21 28 18th 19 12th 19 24th 1

MAR 22 34 14th 29 20th 24 8th 1

APR 19 39 7th 19 13th 17 19th 1

MAY 14 24 19th 16 31st 14 25th 1

JUN 16 23 30th 18 24th 15 18th 1

JUL 15 20 30th 18 24th 15 18th 1

AUG 24 35 17th 27 11th 23 5th 1

SEP 30 46 28th 27 10th 27 22nd 2

OCT 19 24 22nd 23 10th 15 28th 1

NOV 26 35 3rd 32 9th 28 15th 2

DEC 48 73 9th 67 15th 38 27th 3

ANNUAL 

STATISTICS AVG. HIGH MONTH/ DAY 2ND HIGH MONTH/ DAY 3RD HIGH MONTH/ DAY 4TH 

26 93 Jan 1st 75 Jan 7th 73 Dec 9th 6

* Hour Beginning

2009 ANNUAL SUMMARY

PM10 (g/m3) - 24 HOUR AVERAGES

09-23
Location: Reno3 

MONTH AVG. HIGH DATE 2ND HIGH DATE 3RD HIGH DATE 4TH 

JAN 47 72 1st 68 7th 47 31st 4

FEB 17 22 18th 17 24th 14 6th 1

MAR 18 31 14th 31 29th 23 20th 1

APR 14 20 7th 19 22nd 16 4th 1

MAY 15 24 19th 20 22nd 19 16th 1

JUN 14 20 24th 18 27th 18 30th 1

JUL 14 19 30th 17 9th 17 15th 1

AUG 21 33 17th 26 20th 24 11th 2

SEP 23 48 7th 33 28th 24 25th 2

OCT 13 22 4th 20 1st 18 22nd 1

NOV 18 29 24th 27 30th 24 3rd 2

DEC 41 78 18th 72 9th 68 24th 6

ANNUAL 

STATISTICS AVG. HIGH MONTH/ DAY 2ND HIGH MONTH/ DAY 3RD HIGH MONTH/ DAY 4TH 

20 78 Dec 18th 72 Jan 1st 72 Dec 9th 6

* Hour Beginning

2009 ANNUAL SUMMARY

PM10 (g/m3) - 24 HOUR AVERAGES

09-24
Location: South Reno 

MONTH AVG. HIGH DATE 2ND HIGH DATE 3RD HIGH DATE 4TH 

JAN 38 59 7th 47 1st 45 13th 4

FEB 14 19 6th 14 18th 11 12th 1

MAR 13 22 20th 17 14th 11 8th 1

APR 13 15 7th 15 13th 14 19th 1

MAY 15 21 19th 15 25th 15 31st 1

JUN 17 35 30th 17 24th 16 18th 1

JUL 16 24 30th 18 25th 17 18th 1

AUG 20 27 11th 27 17th 19 5th 1

SEP 23 28 28th 25 10th 23 22nd 2

OCT 14 24 10th 12 16th 11 4th 9 

NOV 18 23 3rd 22 9th 15 15th 1

DEC 36 57 31st 44 15th 24 3rd 1

ANNUAL 

STATISTICS AVG. HIGH MONTH/ DAY 2ND HIGH MONTH/ DAY 3RD HIGH MONTH/ DAY 4TH 

20 59 Jan 7th 57 Dec 31st 47 Jan 1st 4

* Hour Beginning

2009 ANNUAL SUMMARY

PM10 (g/m3) - 24 HOUR AVERAGES

09-25
Location: Sparks (designated) 

MONTH AVG. HIGH DATE 2ND HIGH DATE 3RD HIGH DATE 4TH 

JAN 52 64 1st 62 7th 60 13th 6

FEB 17 18 6th 17 18th 16 24th 1

MAR 17 50 14th 48 20th 30 8th 2

APR 16 20 7th 19 22nd 16 4th 1

MAY 14 26 19th 15 25th 14 13th 1

JUN 16 30 24th 23 24th 14 18th 1

JUL 17 23 30th 20 24th 18 18th 1

AUG 21 30 11th 24 17th 20 5th 1

SEP 28 35 28th 29 22nd 28 10th 2

OCT 21 30 10th 23 16th 23 22nd 1

NOV 27 40 3rd 38 9th 20 15th 1

DEC 39 67 9th 47 15th 38 3rd 2

ANNUAL 

STATISTICS AVG. HIGH MONTH/ DAY 2ND HIGH MONTH/ DAY 3RD HIGH MONTH/ DAY 4TH 

24 67 Dec 9th 64 Jan 1st 62 Jan 7th 6

* Hour Beginning

2009 ANNUAL SUMMARY

PM10 (g/m3) - 24 HOUR AVERAGES

09-26
Location: Sparks (collocated) 

MONTH AVG. HIGH DATE 2ND HIGH DATE 3RD HIGH DATE 4TH 

JAN 52 64 7th 63 13th 62 1st 6

FEB 18 19 6th 19 18th 17 24th 1

MAR 17 25 14th 23 20th 20 8th 1

APR 16 27 7th 18 19th 16 13th 9 

MAY 15 26 19th 16 25th 14 13th 1

JUN 16 24 30th 22 24th 15 18th 1

JUL 17 22 30th 20 24th 19 18th 1

AUG 21 31 11th 24 17th 20 5th 1

SEP 28 36 28th 29 22nd 28 10th 2

OCT 20 31 10th 23 16th 22 22nd 1

NOV 26 39 3rd 38 9th 20 15th 1

DEC 38 66 9th 48 15th 39 3rd 2

ANNUAL 

STATISTICS AVG. HIGH MONTH/ DAY 2ND HIGH MONTH/ DAY 3RD HIGH MONTH/ DAY 4TH 

24 66 Dec 9th 64 Jan 7th 63 Jan 13th 6

* Hour Beginning

2009 ANNUAL SUMMARY

PM10 (g/m3) - 24 HOUR AVERAGES

09-27
Location: Toll 

MONTH AVG. HIGH DATE 2ND HIGH DATE 3RD HIGH DATE 4TH 

JAN 28 42 7th 39 1st 32 19th 2

FEB 10 16 6th 9 12th 7 18th 6 

MAR 11 18 20th 13 14th 10 26th 9 

APR 11 13 7th 12 13th 11 19th 9 

MAY 16 34 19th 16 31st 14 25th 1

JUN 13 19 24th 14 18th 12 12th 6 

JUL 15 18 18th 15 6th 15 24th 1

AUG 24 35 11th 29 17th 22 5th 2

SEP 29 39 28th 32 10th 29 16th 2

OCT 13 17 10th 15 22nd 13 16th 1

NOV 15 25 9th 21 3rd 11 15th 1

DEC 24 46 9th 27 27th 24 15th 1

ANNUAL 

STATISTICS AVG. HIGH MONTH/ DAY 2ND HIGH MONTH/ DAY 3RD HIGH MONTH/ DAY 4TH 

18 46 Dec 9th 42 Jan 7th 39 Jan 1st 3

* Hour Beginning

2009 ANNUAL SUMMARY

PM10 (g/m3) - 24 HOUR AVERAGES

09-28
Location: Reno3 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.026 0.062 12/10 0.061 14/9 0.057 15/8 0.0

FEB 0.018 0.046 4/10 0.046 21/18 0.044 20/19 0.0

MAR 0.013 0.051 26/21 0.044 25/6 0.043 5/5 0.0

APR 0.011 0.047 30/5 0.045 4/23 0.043 5/0 0.0

MAY 0.009 0.045 6/4 0.038 4/5 0.037 8/22 0.0

JUN 0.010 0.036 26/23 0.033 23/1 0.029 30/22 0.0

JUL 0.010 0.038 28/8 0.035 29/8 0.035 14/7 0.0

AUG 0.011 0.040 14/7 0.040 20/9 0.038 21/7 0.0

SEP 0.017 0.048 19/0 0.047 21/19 0.043 10/9 0.0

OCT 0.019 0.049 12/8 0.046 23/19 0.045 8/21 0.0

NOV 0.024 0.054 5/9 0.053 17/8 0.052 19/9 0.0

DEC 0.041 0.096 10/10 0.095 9/11 0.083 18/10 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.017 0.096 Dec 10/10 0.095 Dec 9/11 0.083 Dec 18/10 0.0

* Hour Beginning

2009 ANNUAL SUMMARY

NO2 (ppm) - HOURLY AVERAGES

09-29
Location: Reno3 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.045 0.298 15/8 0.272 14/8 0.262 7/8 0.2

FEB 0.014 0.163 5/7 0.144 2/8 0.137 3/7 0.1

MAR 0.008 0.123 14/6 0.107 18/7 0.098 25/6 0.0

APR 0.005 0.074 17/7 0.071 4/6 0.058 30/6 0.0

MAY 0.004 0.074 7/5 0.048 1/7 0.044 4/7 0.0

JUN 0.004 0.039 22/5 0.035 3/7 0.032 23/7 0.0

JUL 0.004 0.045 14/7 0.037 29/7 0.025 1/7 0.0

AUG 0.005 0.064 31/6 0.059 14/7 0.038 .038 0.0

SEP 0.008 0.098 1/6 0.084 28/5 0.065 21/6 0.0

OCT 0.013 0.153 12/8 0.139 29/8 0.115 17/7 0.1

NOV 0.021 0.182 5/9 0.169 30/9 0.147 19/9 0.1

DEC 0.062 0.313 9/7 0.313 18/8 0.278 16/20 0.2

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.016 0.313 Dec 9/7 0.313 Dec 18/8 0.298 Jan 15/8 0.2

* Hour Beginning

2009 ANNUAL SUMMARY

NO (ppm) - HOURLY AVERAGES

09-30
Location: Reno3 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH 

JAN 0.072 0.355 15/8 0.328 14/8 0.305 7/8 0.2

FEB 0.031 0.200 5/7 0.182 2/8 0.180 20/8 0.1

MAR 0.022 0.163 14/6 0.147 18/7 0.141 25/6 0.1

APR 0.016 0.115 17/7 0.106 4/6 0.102 30/6 0.0

MAY 0.013 0.110 7/5 0.078 4/6 0.078 18/6 0.0

JUN 0.013 0.064 22/5 0.058 23/7 0.056 3/7 0.0

JUL 0.013 0.079 14/7 0.071 29/7 0.063 28/8 0.0

AUG 0.015 0.098 14/7 0.093 31/6 0.066 21/7 0.0

SEP 0.024 0.127 1/6 0.117 28/5 0.099 12/7 0.0

OCT 0.032 0.202 12/8 0.182 29/8 0.147 26/7 0.1

NOV 0.044 0.235 5/9 0.218 30/9 0.199 19/9 0.1

DEC 0.103 0.390 9/7 0.385 18/8 0.336 16/20 0.3

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH 

0.033 0.390 Dec 9/7 0.385 Dec 18/8 0.355 Jan 15/8 0.3

* Hour Beginning

2009 ANNUAL SUMMARY

NOx (ppm) - HOURLY AVERAGES

09-31
Washoe County

Ambient Air Monitoring Data

(2008)
Pollutant Averaging Period Exceedance Dates

PM10 24-hour none

PM2.5 24-hour Jun 25 and 26. Jul 2 and 11.

O3 8-hour Jun 13, 14, 24, 25, and 26. Jul 10.

1-hour none

8-hour none

NO2 1-hour none

1-hour

24-hour

3-hour

3-month

quarterly

Pb n/a - Pb was not monitored in 2008.

Exceedances (2008)

CO

SO2 n/a - SO2 was not monitored in 2008.

 08-1
Location: Galletti 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH H

JAN 0.9 2.3 3/9 2.2 13/6 2.0 18/9 1

FEB 0.9 2.0 10/3 1.9 8/10 1.8 7/8 1

MAR 0.7 1.6 19/9 1.6 10/10 1.5 7/9 1

APR 0.5 1.3 2/9 1.3 3/9 1.3 4/8 1

MAY 0.4 1.0 5/10 1.0 16/8 0.9 20/7 0

JUN 0.4 1.5 25/9 1.2 24/23 0.9 14/7 0

JUL 0.5 2.0 10/10 1.4 21/8 1.4 4/19 1

AUG 0.5 1.2 16/7 1.2 30/7 1.1 15/8 1

SEP 0.7 1.9 25/10 1.6 26/9 1.3 9/8 1

OCT 0.8 2.4 24/7 2.0 28/10 1.8 15/9 1

NOV 0.9 2.3 13/1 2.0 19/0 2.0 19/10 1

DEC 0.8 2.6 7/5 1.9 1/9 1.9 11/11 1

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH H

0.7 2.6 Dec 7/5 2.4 Oct 24/7 2.3 Jan 3/9 2

* Hour Beginning

CARBON MONOXIDE (ppm) - EIGHT (8) HOUR AVERAGES

2008 ANNUAL SUMMARY

08-2
Location: Lemmon Valley 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4T

HIG

JAN 0.4 1.5 3/4 1.1 18/9 1.1 25/10 1

FEB 0.5 1.3 10/3 1.0 6/1 1.0 26/8 1

MAR 0.3 0.9 10/6 0.9 22/2 0.8 9/3 0

APR 0.2 0.5 2/7 0.5 3/11 0.5 11/7 0

MAY 0.3 0.5 5/6 0.5 19/9 0.4 8/7 0

JUN 0.3 1.5 25/9 1.4 25/1 1.2 26/7 0

JUL 0.4 1.3 10/6 1.2 11/0 0.9 13/7 0

AUG 0.3 0.4 15/9 0.4 12/10 0.4 29/7 0

SEP 0.2 0.4 14/4 0.4 10/7 0.4 11/2 0

OCT 0.3 0.8 25/2 0.7 23/7 0.7 27/9 0

NOV 0.4 1.1 22/2 1.1 16/1 1.1 18/0 1

DEC 0.5 1.2 6/2 1.2 31/7 1.1 7/1 1

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH H

0.3 1.5 Jan 3/4 1.5 Jun 25/9 1.3 Feb 10/3 1

* Hour Beginning

2008 ANNUAL SUMMARY

CARBON MONOXIDE (ppm) - EIGHT (8) HOUR AVERAGES

08-3
Location: Reno3 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH H

JAN 0.3 1.5 3/3 1.4 3/11 1.4 12/3 1

FEB 0.2 0.8 6/2 0.8 7/8 0.8 13/3 0

MAR 0.1 0.7 12/13 0.6 17/12 0.6 19/9 0

APR 0.1 0.5 12/1 0.4 27/1 0.2 18/9 0

MAY 0.1 0.3 16/6 0.3 20/9 0.2 5/10 0

JUN 0.2 1.3 25/1 1.3 25/10 0.7 28/4 0

JUL 0.2 1.1 11/3 1.0 10/10 0.8 10/2 0

AUG 0.1 0.3 25/8 0.3 30/8 0.2 6/23 0

SEP 0.1 0.8 25/12 0.3 27/0 0.3 27/22 0

OCT 0.2 0.9 28/13 0.8 15/11 0.6 24/12 0

NOV 0.3 1.3 19/13 1.2 13/0 1.0 15/1 0

DEC 0.4 1.8 31/23 1.6 28/4 1.6 31/12 1

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH H

0.2 1.8 Dec 31/23 1.6 Dec 28/4 1.6 Dec 31/12 1

* Hour Beginning

2008 ANNUAL SUMMARY

CARBON MONOXIDE (ppm) - EIGHT (8) HOUR AVERAGES

08-4
Location: South Reno 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH H

JAN 0.5 1.2 3/10 1.1 15/9 1.0 2/23 0

FEB 0.5 1.0 12/1 0.9 13/4 0.8 6/3 0

MAR 0.4 0.7 12/10 0.7 19/10 0.7 24/12 0

APR 0.4 0.7 11/8 0.6 18/8 0.6 17/8 0

MAY 0.3 0.5 5/12 0.5 16/8 0.5 20/6 0

JUN 0.4 1.3 25/1 1.2 25/10 1.0 26/9 0

JUL 0.5 1.3 10/10 1.3 11/6 1.1 10/22 0

AUG 0.3 0.7 25/8 0.7 29/9 0.7 27/9 0

SEP 0.3 0.7 4/9 0.7 25/10 0.7 2/10 0

OCT 0.3 0.6 13/9 0.6 24/10 0.6 28/11 0

NOV 0.4 1.3 25/1 1.0 24/13 0.9 22/13 0

DEC 0.6 1.3 31/11 1.2 21/6 1.1 18/13 1

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH H

0.4 1.3 Jun 25/1 1.3 Jul 10/10 1.3 Nov 25/1 1

* Hour Beginning

2008 ANNUAL SUMMARY

CARBON MONOXIDE (ppm) - EIGHT (8) HOUR AVERAGES

08-5
Location: Sparks 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH H

JAN 0.7 2.1 3/2 2.0 13/4 1.9 18/8 1

FEB 0.7 1.9 9/4 1.8 10/4 1.8 8/10 1

MAR 0.4 1.3 18/8 1.3 17/9 1.2 7/7 1

APR 0.3 1.1 2/8 0.9 17/7 0.9 18/7 0

MAY 0.3 2.0 31/19 0.9 17/2 0.9 2/6 0

JUN 0.5 1.7 1/20 1.7 25/9 1.5 24/23 1

JUL 0.5 1.5 10/9 1.3 11/1 1.1 10/1 1

AUG 0.3 0.8 29/10 0.7 12/7 0.6 7/7 0

SEP 0.4 1.1 29/10 1.0 14/1 0.9 25/10 0

OCT 0.6 1.7 27/23 1.6 28/9 1.5 24/9 1

NOV 0.9 2.1 18/0 2.1 13/0 2.1 29/2 2

DEC 0.9 2.8 31/23 2.8 7/0 2.7 8/0 2

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH H

0.5 2.8 Dec 31/23 2.8 Dec 7/0 2.7 Dec 8/0 2

* Hour Beginning

2008 ANNUAL SUMMARY

CARBON MONOXIDE (ppm) - EIGHT (8) HOUR AVERAGES

08-6
Location: Toll 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH H

JAN 0.2 0.8 3/9 0.8 15/9 0.6 10/13 0

FEB 0.2 0.5 27/12 0.4 28/10 0.3 5/11 0

MAR 0.2 0.4 6/12 0.4 12/11 0.4 7/12 0

APR 0.1 0.4 22/11 0.3 25/23 0.3 28/9 0

MAY 0.1 0.2 5/11 0.2 27/11 0.2 1/9 0

JUN 0.2 0.8 25/2 0.8 25/11 0.7 24/11 0

JUL 0.2 0.8 10/10 0.7 11/2 0.5 10/2 0

AUG 0.1 0.2 1/12 0.2 7/10 0.2 29/9 0

SEP 0.1 0.5 27/13 0.4 25/8 0.4 29/11 0

OCT 0.1 0.4 30/11 0.4 29/11 0.3 28/11 0

NOV 0.4 0.8 22/14 0.8 19/12 0.8 25/23 0

DEC 0.5 1.0 18/11 0.9 21/11 0.9 11/12 0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH H

0.2 1.0 Dec 18/11 0.9 Dec 21/11 0.9 Dec 11/12 0

* Hour Beginning

2008 ANNUAL SUMMARY

CARBON MONOXIDE (ppm) - EIGHT (8) HOUR AVERAGES

08-7
Location: Incline 

MONTH HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH H

JAN NA NA NA NA N

FEB NA NA NA NA N

MAR NA NA NA NA N

APR NA NA NA NA N

MAY 0.034 0.057 31/10 0.052 30/14 0.049 25/14 0.0

JUN 0.047 0.092 24/18 0.086 25/10 0.078 13/16 0.0

JUL 0.048 0.081 7/15 0.079 10/10 0.079 16/12 0.0

AUG 0.042 0.071 14/18 0.070 15/10 0.063 16/11 0.0

SEP 0.042 0.063 4/10 0.062 17/13 0.062 24/11 0.0

OCT 0.032 0.057 1/10 0.054 25/14 0.053 24/13 0.0

NOV 0.026 0.045 14/20 0.043 20/5 0.043 23/13 0.0

DEC 0.026 0.050 2/12 0.044 8/5 0.044 9/10 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH H

0.025 0.092 Jun 24/18 0.086 Jun 25/10 0.081 Jul 7/15 0.0

* Hour Beginning

Incline shelter down until May 14, 2008

2008 ANNUAL SUMMARY

OZONE (ppm) - ONE (1) HOUR AVERAGES

08-8
Location: Lemmon Valley 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH H

JAN 0.028 0.056 27/16 0.049 20/13 0.048 8/5 0.0

FEB 0.026 0.054 27/14 0.053 24/6 0.051 20/15 0.0

MAR 0.037 0.058 7/14 0.057 12/11 0.056 8/13 0.0

APR 0.045 0.076 29/13 0.070 18/12 0.068 19/3 0.0

MAY 0.041 0.071 3/12 0.070 20/20 0.068 10/14 0.0

JUN 0.048 0.102 24/18 0.099 25/9 0.085 14/10 0.0

JUL 0.050 0.094 10/11 0.080 9/15 0.080 26/10 0.0

AUG 0.041 0.072 12/15 0.071 11/16 0.071 16/10 0.0

SEP 0.035 0.069 17/13 0.069 23/16 0.067 24/13 0.0

OCT 0.025 0.068 1/13 0.053 18/12 0.053 25/14 0.0

NOV 0.017 0.046 3/14 0.042 2/21 0.042 19/14 0.0

DEC 0.022 0.048 2/10 0.044 21/22 0.044 25/12 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH H

0.035 0.102 Jun 24/18 0.099 Jun 25/9 0.094 Jul 10/11 0.0

* Hour Beginning

2008 ANNUAL SUMMARY

OZONE (ppm) - ONE (1) HOUR AVERAGES

08-9
Location: Reno3 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH H

JAN 0.019 0.053 27/16 0.046 20/12 0.045 28/0 0.0

FEB 0.019 0.051 29/23 0.049 24/4 0.047 17/14 0.0

MAR 0.030 0.056 9/15 0.054 8/14 0.053 1/3 0.0

APR 0.039 0.072 29/11 0.068 18/20 0.067 19/4 0.0

MAY 0.036 0.071 3/13 0.064 5/16 0.064 11/18 0.0

JUN 0.044 0.110 25/11 0.096 24/18 0.084 26/15 0.0

JUL 0.045 0.094 10/11 0.088 19/12 0.086 27/11 0.0

AUG 0.036 0.073 6/13 0.073 7/12 0.069 12/14 0.0

SEP 0.032 0.066 4/13 0.064 3/16 0.064 6/15 0.0

OCT 0.020 0.058 1/12 0.049 15/15 0.047 9/2 0.0

NOV 0.011 0.040 3/14 0.038 2/4 0.038 4/0 0.0

DEC 0.013 0.044 2/11 0.043 21/22 0.041 19/3 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH H

0.029 0.110 Jun 25/11 0.096 Jun 24/18 0.094 Jul 10/11 0.0

* Hour Beginning

2008 ANNUAL SUMMARY

OZONE (ppm) - ONE (1) HOUR AVERAGES

08-10
Location: South Reno 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH H

JAN 0.019 0.053 27/16 0.046 28/0 0.045 20/13 0.0

FEB 0.020 0.055 29/23 0.052 24/5 0.050 26/15 0.0

MAR 0.032 0.059 9/15 0.056 8/14 0.056 23/13 0.0

APR 0.033 0.069 29/13 0.062 19/19 0.058 14/19 0.0

MAY 0.028 0.054 3/12 0.052 11/20 0.052 12/14 0.0

JUN 0.034 0.086 25/10 0.080 24/18 0.072 26/12 0.0

JUL 0.038 0.092 10/11 0.087 19/12 0.078 26/11 0.0

AUG 0.030 0.062 6/12 0.059 12/14 0.059 16/9 0.0

SEP 0.028 0.070 4/14 0.069 3/17 0.062 13/11 0.0

OCT 0.018 0.057 1/12 0.047 28/13 0.045 17/14 0.0

NOV 0.010 0.040 3/12 0.038 4/2 0.036 20/13 0.0

DEC 0.013 0.044 2/12 0.042 21/21 0.040 19/3 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH H

0.025 0.092 Jul 10/11 0.087 Jul 19/12 0.086 Jun 25/10 0.0

* Hour Beginning

2008 ANNUAL SUMMARY

OZONE (ppm) - ONE (1) HOUR AVERAGES

08-11
Location: Sparks 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH H

JAN 0.019 0.053 27/15 0.044 20/11 0.041 28/2 0.0

FEB 0.018 0.052 27/14 0.050 29/23 0.048 17/14 0.0

MAR 0.030 0.055 8/14 0.055 23/13 0.054 7/14 0.0

APR 0.039 0.073 29/13 0.065 18/9 0.065 19/14 0.0

MAY 0.035 0.074 3/12 0.066 5/15 0.066 31/11 0.0

JUN 0.040 0.112 25/10 0.101 24/12 0.086 26/11 0.0

JUL 0.040 0.106 10/11 0.092 19/12 0.084 14/12 0.0

AUG 0.031 0.073 6/13 0.071 10/13 0.070 12/13 0.0

SEP 0.025 0.070 24/12 0.066 3/16 .063 13/11 0.0

OCT 0.018 0.059 1/12 0.049 18/14 0.048 15/14 0.0

NOV 0.011 0.040 3/12 0.038 4/0 0.036 14/14 0.0

DEC 0.013 0.046 2/11 0.040 21/22 0.040 25/12 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH H

0.027 0.112 Jun 25/10 0.106 Jul 10/11 0.101 Jun 24/12 0.0

* Hour Beginning

2008 ANNUAL SUMMARY

OZONE (ppm) - ONE (1) HOUR AVERAGES

08-12
Location: Toll 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH H

JAN 0.022 0.045 27/15 0.042 20/13 0.039 5/0 0.0

FEB 0.024 0.043 29/23 0.042 27/14 0.041 24/2 0.0

MAR 0.029 0.046 1/3 0.046 12/12 0.045 9/15 0.0

APR 0.039 0.075 29/15 0.073 18/21 0.071 19/1 0.0

MAY 0.039 0.068 3/15 0.066 13/12 0.064 5/15 0.0

JUN 0.044 0.101 25/10 0.084 24/12 0.083 26/12 0.0

JUL 0.043 0.098 10/11 0.083 14/12 0.079 19/11 0.0

AUG 0.036 0.066 16/10 0.064 6/12 0.064 10/14 0.0

SEP 0.034 0.065 4/15 0.059 3/17 0.059 24/11 0.0

OCT 0.025 0.054 1/12 0.048 18/13 0.046 25/14 0.0

NOV 0.017 0.041 3/12 0.040 20/8 0.039 4/11 0.0

DEC 0.020 0.045 2/12 0.041 18/22 0.041 29/10 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH H

0.031 0.101 Jun 25/10 0.098 Jul 10/11 0.084 Jun 24/12 0.0

* Hour Beginning

2008 ANNUAL SUMMARY

OZONE (ppm) - ONE (1) HOUR AVERAGES

08-13
Location: Incline 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH H

JAN NA NA NA N

FEB NA NA NA N

MAR NA NA NA N

APR NA NA NA N

MAY 0.033 0.055 31/8 0.049 30/10 0.044 27/10 0.0

JUN 0.046 0.075 24/11 0.073 14/11 0.072 13/11 0.0

JUL 0.048 0.074 26/10 0.072 10/9 0.067 13/11 0.0

AUG 0.042 0.060 14/17 0.060 15/8 0.058 12/10 0.0

SEP 0.041 0.059 24/9 0.057 17/9 0.056 4/8 0.0

OCT 0.032 0.047 1/9 0.047 24/9 0.046 25/8 0.0

NOV 0.025 0.040 3/8 0.039 3/20 0.039 14/18 0.0

DEC 0.025 0.042 2/8 0.041 8/2 0.040 18/17 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH H

0.024 0.075 Jun 24/7 0.074 Jul 26/10 0.073 Jun 14/11 0.0

* Hour Beginning

2008 ANNUAL SUMMARY

OZONE (ppm) - EIGHT (8) HOUR AVERAGES

08-14
Location: Lemmon Valley 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH H

JAN 0.028 0.050 27/15 0.046 20/10 0.045 8/4 0.0

FEB 0.026 0.051 29/22 0.048 20/11 0.046 24/3 0.0

MAR 0.036 0.054 8/7 0.054 12/8 0.053 7/13 0.0

APR 0.045 0.073 29/8 0.070 29/16 0.069 18/9 0.0

MAY 0.041 0.068 3/10 0.063 5/11 0.063 13/8 0.0

JUN 0.048 0.096 24/12 0.081 25/8 0.078 13/13 0.0

JUL 0.049 0.084 10/9 0.072 9/11 0.071 19/8 0.0

AUG 0.041 0.064 12/10 0.059 6/8 0.059 11/11 0.0

SEP 0.034 0.062 24/9 0.061 17/10 0.060 23/10 0.0

OCT 0.025 0.056 1/9 0.045 18/11 0.045 24/10 0.0

NOV 0.017 0.041 3/10 0.040 2/14 0.039 3/18 0.0

DEC 0.021 0.044 2/8 0.041 18/12 0.041 18/20 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH H

0.034 0.096 Jun 24/12 0.084 Jul 10/9 0.081 Jun 25/8 0.0

* Hour Beginning

2008 ANNUAL SUMMARY

OZONE (ppm) - EIGHT (8) HOUR AVERAGES

08-15
Location: Reno3 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH H

JAN 0.018 0.048 27/15 0.043 20/8 0.041 4/22 0.0

FEB 0.019 0.050 29/22 0.044 24/3 0.040 3/2 0.0

MAR 0.030 0.052 8/8 0.050 9/10 0.049 23/11 0.0

APR 0.039 0.067 29/8 0.066 29/16 0.064 18/13 0.0

MAY 0.036 0.066 3/10 0.060 11/11 0.059 5/11 0.0

JUN 0.043 0.088 24/11 0.076 14/16 0.076 26/9 0.0

JUL 0.044 0.078 10/11 0.073 19/8 0.071 26/8 0.0

AUG 0.036 0.063 12/9 0.059 6/9 0.059 10/10 0.0

SEP 0.031 0.057 3/10 0.057 24/8 0.056 13/9 0.0

OCT 0.019 0.045 1/11 0.045 8/19 0.038 5/9 0.0

NOV 0.011 0.037 3/19 0.034 2/2 0.034 4/3 0.0

DEC 0.013 0.039 2/8 0.039 18/19 0.038 19/3 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH H

0.028 0.088 Jun 24/11 0.078 Jul 10/11 0.076 Jun 14/16 0.0

* Hour Beginning

2008 ANNUAL SUMMARY

OZONE (ppm) - EIGHT (8) HOUR AVERAGES

08-16
Location: South Reno 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH H

JAN 0.019 0.049 27/13 0.044 27/21 0.042 4/20 0.0

FEB 0.020 0.052 29/20 0.048 24/2 0.044 24/10 0.0

MAR 0.031 0.054 8/8 0.053 9/10 0.051 23/11 0.0

APR 0.032 0.063 29/8 0.058 19/13 0.057 29/16 0.0

MAY 0.028 0.053 3/11 0.049 11/13 0.048 10-Dec 0.0

JUN 0.034 0.072 24/12 0.067 26/9 0.065 25/9 0.0

JUL 0.038 0.079 10/10 0.071 26/9 0.067 19/9 0.0

AUG 0.029 0.055 12/11 0.054 6/9 0.051 10/10 0.0

SEP 0.027 0.057 4/9 0.056 3/10 0.055 6/11 0.0

OCT 0.018 0.046 1/9 0.038 5/9 0.037 7/10 0.0

NOV 0.010 0.037 3/11 0.034 4/8 0.031 2/8 0.0

DEC 0.012 0.038 18/19 0.038 19/3 0.037 2/8 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH H

0.025 0.079 Jul 10/10 0.072 Jun 24/12 0.071 Jul 26/9 0.0

* Hour Beginning

2008 ANNUAL SUMMARY

OZONE (ppm) - EIGHT (8) HOUR AVERAGES

08-17
Location: Sparks 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH H

JAN 0.019 0.048 27/12 0.042 27/20 0.041 20/7 0.0

FEB 0.018 0.048 29/22 0.043 24/3 0.042 6/9 0.0

MAR 0.029 0.052 8/8 0.049 9/11 0.049 21/9 0.0

APR 0.038 0.068 29/7 0.067 29/15 0.063 18/8 0.0

MAY 0.035 0.061 11/12 0.061 13/9 0.062 5/10 0.0

JUN 0.039 0.086 24/11 0.075 26/9 0.074 13/13 0.0

JUL 0.039 0.082 10/10 0.075 19/10 0.073 26/9 0.0

AUG 0.031 0.062 12/9 0.061 6/9 0.060 6/9 0.0

SEP 0.025 0.058 24/10 0.055 3/10 0.055 17/11 0.0

OCT 0.017 0.044 1/10 0.040 5/9 0.038 9/8 0.0

NOV 0.010 0.036 3/11 0.035 3/19 0.034 2/6 0.0

DEC 0.013 0.041 2/8 0.037 18/20 0.036 19/4 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH H

0.026 0.086 Jun 24/11 0.082 Jul 10/10 0.075 Jun 26/9 0.0

* Hour Beginning

2008 ANNUAL SUMMARY

OZONE (ppm) - EIGHT (8) HOUR AVERAGES

08-18
Location: Toll 

MONTH AVG. HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH H

JAN 0.021 0.041 27/11 0.039 20/8 0.038 4/23 0.0

FEB 0.023 0.043 29/23 0.039 24/0 0.037 28/9 0.0

MAR 0.028 0.042 1/0 0.042 8/8 0.041 1/9 0.0

APR 0.038 0.071 29/10 0.070 18/18 0.066 29/18 0.0

MAY 0.038 0.065 3/10 0.062 13/7 0.060 5/10 0.0

JUN 0.044 0.076 25/8 0.076 26/10 0.075 24/10 0.0

JUL 0.043 0.079 10/9 0.070 26/9 0.068 27/10 0.0

AUG 0.036 0.065 12/8 0.064 11/11 0.062 28/10 0.0

SEP 0.033 0.057 4/8 0.055 24/10 0.052 17/10 0.0

OCT 0.025 0.046 1/10 0.038 18/12 0.037 5/9 0.0

NOV 0.016 0.038 3/10 0.037 20/5 0.035 2/10 0.0

DEC 0.020 0.039 2/9 0.039 18/13 0.039 29/8 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH H

0.030 0.079 Jul 10/9 0.076 Jun 25/8 0.076 Jun 26/10 0.0

* Hour Beginning

2008 ANNUAL SUMMARY

OZONE (ppm) - EIGHT (8) HOUR AVERAGES

08-19
Location: Reno3 (designated) 

MONTH AVG. HIGH DATE 2ND HIGH DATE 3RD HIGH DATE 4TH H

JAN 8.7 21.5 19th 12.0 13th 11.7 25th 11

FEB 7.3 10.9 9th 10.3 21st 9.8 15th 9

MAR 4.5 8.2 7th 6.8 22nd 6.2 10th 6

APR 5.6 9.8 27th 8.9 18th 5.6 3rd 5

MAY 6.2 11.8 9th 10.4 3rd 6.8 6th 5

JUN 25.7 114.7 25th 61.1 26th 34.3 23rd 30

JUL 24.8 53.6 2nd 47.0 11th 34.3 14th 23

AUG 5.1 8.8 16th 8.3 13th 6.3 7th 5

SEP 6.5 8.6 24th 8.2 15th 7.7 9th 7

OCT 7.2 10.4 18th 10.0 24th 8.1 15th 7

NOV 9.8 16.0 23rd 12.9 11th 12.2 29th 12

DEC 10.8 20.5 20th 20.4 17th 17.0 11th 11

ANNUAL 

STATISTICS AVG. HIGH MONTH/ DAY 2ND HIGH MONTH/ DAY 3RD HIGH MONTH/ DAY 4TH H

10.20 114.70 Jun 25th 61.10 Jun 26th 53.60 Jul 2nd 47

* Hour Beginning

2008 ANNUAL SUMMARY

PM-2.5 (g/m3) - 24 HOUR AVERAGES

08-20
Location: Reno3 (colocated) 

MONTH AVG. HIGH DATE 2ND HIGH DATE 3RD HIGH DATE 4TH H

JAN 8.8 22.0 19th 11.7 25th 11.0 7th 10

FEB 7.7 11.5 9th 11.0 21st 10.3 15th 9

MAR 4.6 8.8 7th 6.9 22nd 6.6 10th 6

APR 5.5 9.3 27th 8.5 18th 6.6 21st 5

MAY 6.2 11.9 9th 10.5 3rd 7.3 6th 6

JUN 22.5 115.4 25th 34.7 23rd 30.8 29th 16

JUL 25.1 54.3 2nd 47.2 11th 34.5 14th 24

AUG 5.2 8.9 16th 8.4 13th 6.7 7th 5

SEP 6.5 8.8 24th 8.3 15th 7.4 9th 6

OCT 7.3 10.3 18th 10.1 24th 10.1 27th 8

NOV 9.8 15.6 23rd 13.0 11th 12.1 26th 11

DEC 10.4 20.3 17th 16.5 11th 11.4 29th 11

ANNUAL 

STATISTICS AVG. HIGH MONTH/ DAY 2ND HIGH MONTH/ DAY 3RD HIGH MONTH/ DAY 4TH H

9.90 115.40 Jun 25th 54.30 Jul 2nd 47.20 Jul 11th 34

* Hour Beginning

2008 ANNUAL SUMMARY

PM-2.5 (g/m3) - 24 HOUR AVERAGES

08-21
Location: Galletti 

MONTH AVG. HIGH DATE 2ND HIGH DATE 3RD HIGH DATE 4TH H

JAN 45 87 31st 65 19th 32 13th 3

FEB 46 87 12th 50 6th 42 18th 8 

MAR 57 86 25th 85 7th 66 19th 5

APR 37 78 18th 30 30th 29 12th 2

MAY 27 40 6th 37 12th 25 18th 2

JUN 38 61 23rd 55 29th 31 17th 2

JUL 50 78 11th 55 17th 48 23rd 3

AUG 34 49 16th 39 4th 32 28th 3

SEP 39 54 9th 48 15th 41 3rd 3

OCT 47 73 27th 50 15th 48 3rd 3

NOV 35 66 20th 39 26th 32 8th 2

DEC 37 62 8th 62 20th 24 2nd 2

ANNUAL 

STATISTICS AVG. HIGH MONTH/ DAY 2ND HIGH MONTH/ DAY 3RD HIGH MONTH/ DAY 4TH H

41 87 Jan 31st 87 Feb 12th 86 Mar 25th 8

* Hour Beginning

2008 ANNUAL SUMMARY

PM-10,g/m3 - 24 HOUR AVERAGES

08-22
Location: Plumbkit 

MONTH HIGH DATE 2ND HIGH DATE 3RD HIGH DATE 4TH H

JAN 43 76 19th 49 31st 36 1st 3

FEB 43 71 12th 53 6th 43 18th 7 

MAR 22 35 7th 30 19th 29 25th 1

APR 24 40 18th 26 12th 22 24th 1

MAY 18 23 6th 23 12th 21 18th 1

JUN 32 55 29th 52 23rd 24 17th 1

JUL 46 86 11th 45 5th 38 23rd 3

AUG 21 29 16th 24 28th 20 22nd 1

SEP 27 36 15th 35 9th 28 3rd 2

OCT 31 52 27th 38 15th 24 21st 2

NOV 27 37 26th 35 20th 27 8th 3

DEC 38 76 20th 50 8th 26 26th 2

ANNUAL 

STATISTICS AVG. HIGH MONTH/ DAY 2ND HIGH MONTH/ DAY 3RD HIGH MONTH/ DAY 4TH H

31 86 Jul 11th 76 Jan 19th 76 Dec 20th 7

* Hour Beginning

2008 ANNUAL SUMMARY

PM-10 (g/m3) - 24 HOUR AVERAGES

08-23
Location: Reno3 

MONTH HIGH DATE 2ND HIGH DATE 3RD HIGH DATE 4TH H

JAN 33 61 19th 36 31st 30 1st 2

FEB 33 49 6th 46 12th 31 18th 7 

MAR 23 44 7th 34 19th 31 25th 1

APR 18 29 18th 21 30th 17 12th 1

MAY 21 29 12th 25 18th 22 6th 2

JUN 43 92 26th 52 29th 20 17th 1

JUL 43 84 11th 39 5th 34 23rd 3

AUG 21 31 28th 27 16th 21 22nd 1

SEP 23 31 9th 25 3rd 24 27th 1

OCT 29 40 27th 35 9th 32 15th 2

NOV 26 37 20th 36 26th 30 14th 2

DEC 32 60 20th 57 8th 19 2nd 1

ANNUAL 

STATISTICS AVG. HIGH MONTH/ DAY 2ND HIGH MONTH/ DAY 3RD HIGH MONTH/ DAY 4TH H

29 92 Jun 26th 84 Jul 11th 61 Jan 19th 6

* Hour Beginning

2008 ANNUAL SUMMARY

PM-10 (g/m3) - 24 HOUR AVERAGES

08-24
Location: South Reno 

MONTH HIGH DATE 2ND HIGH DATE 3RD HIGH DATE 4TH H

JAN 26 44 19th 24 1st 24 7th 2

FEB 43 111 12th 32 18th 27 6th 4 

MAR 15 25 7th 21 25th 17 19th 1

APR 18 28 18th 25 12th 16 24th 1

MAY 17 23 12th 23 18th 21 6th 1

JUN 26 45 29th 44 23rd 17 17th 1

JUL 39 68 11th 49 5th 34 23rd 2

AUG 19 28 16th 20 28th 19 22nd 1

SEP 22 29 15th 26 3rd 22 9th 2

OCT 21 35 27th 21 15th 20 21st 1

NOV 18 28 20th 25 26th 17 8th 1

DEC 22 36 20th 32 8th 17 26th 1

ANNUAL 

STATISTICS AVG. HIGH MONTH/ DAY 2ND HIGH MONTH/ DAY 3RD HIGH MONTH/ DAY 4TH H

23 111 Feb 12th 68 Jul 11th 49 Jul 5th 4

* Hour Beginning

2008 ANNUAL SUMMARY

PM-10 (g/m3) - 24 HOUR AVERAGES

08-25
Location: Sparks (Designated) 

MONTH HIGH DATE 2ND HIGH DATE 3RD HIGH DATE 4TH H

JAN 31 63 19th 32 31st 27 13th 2

FEB 33 60 12th 37 18th 29 6th 6 

MAR 19 31 7th 23 25th 20 19th 1

APR 17 27 18th 23 12th 12 30th 1

MAY 18 25 6th 22 12th 22 18th 1

JUN 42 101 26th 58 23rd 48 29th 2

JUL 40 57 11th 51 23rd 35 17th 3

AUG 19 29 16th 19 22nd 18 28th 1

SEP 26 33 9th 29 15th 28 3rd 2

OCT 27 59 27th 28 15th 22 21st 1

NOV 24 30 20th 29 8th 29 26th 2

DEC 34 56 8th 51 20th 29 2nd 2

ANNUAL 

STATISTICS AVG. HIGH MONTH/ DAY 2ND HIGH MONTH/ DAY 3RD HIGH MONTH/ DAY 4TH H

27 101 Jun 26th 63 Jan 19th 60 Feb 12th 5

* Hour Beginning

2008 ANNUAL SUMMARY

PM-10 (g/m3) - 24 HOUR AVERAGES

08-26
Location: Sparks (Collocated) 

MONTH HIGH DATE 2ND HIGH DATE 3RD HIGH DATE 4TH H

JAN 32 63 19th 35 31st 27 25th 2

FEB 33 61 12th 37 18th 29 6th 7 

MAR 15 32 7th 21 19th 16 1st 1

APR 17 27 18th 25 12th 13 30th 1

MAY 16 22 6th 19 12th 19 18th 1

JUN 31 59 23rd 49 29th 22 17th 1

JUL 40 57 11th 52 23rd 34 17th 3

AUG 20 29 16th 20 22nd 19 28th 1

SEP 26 34 9th 29 15th 28 3rd 2

OCT 28 60 27th 28 15th 22 21st 1

NOV 24 30 20th 28 26th 28 8th 2

DEC 35 59 8th 50 20th 29 2nd 2

ANNUAL 

STATISTICS AVG. HIGH MONTH/ DAY 2ND HIGH MONTH/ DAY 3RD HIGH MONTH/ DAY 4TH H

26 63 Jan 19th 61 Feb 12th 60 Oct 27th 5

* Hour Beginning

2008 ANNUAL SUMMARY

PM-10 (g/m3) - 24 HOUR AVERAGES

08-27
Location: Toll 

MONTH HIGH DATE 2ND HIGH DATE 3RD HIGH DATE 4TH H

JAN 23 40 19th 24 7th 24 13th 1

FEB 20 32 6th 25 12th 23 18th 2 

MAR 20 36 7th 28 1st 24 25th 1

APR 14 21 18th 14 24th 13 30th 1

MAY 16 22 12th 21 18th 17 6th 1

JUN 25 44 29th 42 23rd 18 17th 1

JUL 36 64 11th 38 5th 34 23rd 2

AUG 19 25 16th 23 28th 19 22nd 1

SEP 24 35 9th 26 15th 25 3rd 2

OCT 21 36 27th 19 15th 17 21st 1

NOV 14 23 26th 20 20th 9 8th 5 

DEC 18 38 20th 26 8th 12 2nd 9 

ANNUAL 

STATISTICS AVG. HIGH MONTH/ DAY 2ND HIGH MONTH/ DAY 3RD HIGH MONTH/ DAY 4TH H

21 64 Jul 11th 44 Jun 29th 42 Jun 23rd 4

* Hour Beginning

2008 ANNUAL SUMMARY

PM-10 (g/m3) - 24 HOUR AVERAGES

08-28
Location: Reno3 

MONTH HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH H

JAN 0.024 0.059 10/12 0.056 7/9 0.053 3/10 0.0

FEB 0.025 0.052 21/10 0.050 5/23 0.050 6/0 0.0

MAR 0.017 0.054 12/8 0.052 10/7 0.051 7/7 0.0

APR 0.014 0.055 22/6 0.051 18/4 0.046 21/7 0.0

MAY 0.012 0.042 13/6 0.042 20/4 0.041 2/6 0.0

JUN 0.012 0.045 16/1 0.043 3/6 0.043 25/7 0.0

JUL 0.014 0.075 10/9 0.047 16/6 0.044 15/6 0.0

AUG 0.012 0.048 30/1 0.042 25/8 0.039 7/9 0.0

SEP 0.016 0.064 25/9 0.055 9/8 0.053 24/22 0.0

OCT 0.019 0.050 24/10 0.048 23/17 0.048 28/11 0.0

NOV 0.023 0.063 19/11 0.060 20/8 0.052 18/11 0.0

DEC 0.026 0.060 31/11 0.059 1/10 0.055 7/9 0.0

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH H

0.018 0.075 Jul 10/9 0.064 Sept 25/9 0.063 Nov 19/11 0.0

* Hour Beginning

2008 ANNUAL SUMMARY

NO2 (ppm) - HOURLY AVERAGES

08-29
Location: Reno3 

MONTH HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH H

JAN 0.025 0.221 3/7 0.176 2/23 0.145 15/8 0.1

FEB 0.019 0.154 7/8 0.137 21/7 0.123 15/7 0.1

MAR 0.013 0.188 12/7 0.174 10/7 0.148 7/7 0.1

APR 0.008 0.105 11/22 0.081 2/6 0.072 21/7 0.0

MAY 0.006 0.077 16/6 0.067 20/5 0.064 5/7 0.0

JUN 0.004 0.079 27/7 0.058 9/6 0.051 13/7 0.0

JUL 0.004 0.062 29/6 0.057 15/6 0.051 16/6 0.0

AUG 0.005 0.083 29/8 0.063 28/7 0.057 21/6 0.0

SEP 0.007 0.137 25/9 0.116 19/6 0.084 16/8 0.0

OCT 0.016 0.240 28/6 0.226 15/6 0.218 13/6 0.1

NOV 0.034 0.277 20/8 0.221 19/9 0.238 11/8 0.1

DEC 0.037 0.252 31/7 0.209 1/10 0.201 10/8 0.1

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH H

0.015 0.277 Nov 20/8 0.252 Dec 31/7 0.240 Oct 28/6 0.2

* Hour Beginning

2008 ANNUAL SUMMARY

NO (ppm) - HOURLY AVERAGES

08-30
Location: Reno3 

MONTH HIGH DATE/ HOUR* 2ND HIGH DATE/ HOUR* 3RD HIGH DATE/ HOUR* 4TH H

JAN 0.050 0.265 3/7 0.216 2/23 0.192 7/9 0.1

FEB 0.045 0.196 7/8 0.185 21/10 0.168 6/0 0.1

MAR 0.030 0.239 12/7 0.226 10/7 0.199 7/7 0.1

APR 0.022 0.145 11/22 0.123 22/7 0.120 2/6 0.1

MAY 0.019 0.108 16/6 0.107 20/5 0.098 5/7 0.0

JUN 0.017 0.122 27/7 0.091 9/6 0.089 13/7 0.0

JUL 0.019 0.106 29/6 0.102 15/6 0.099 10/9 0.0

AUG 0.019 0.121 29/8 0.095 25/7 0.086 28/7 0.0

SEP 0.023 0.202 25/9 0.162 19/7 0.138 9/8 0.1

OCT 0.036 0.283 28/6 0.261 15/6 0.254 13/6 0.1

NOV 0.057 0.337 20/8 0.280 11/8 0.276 19/9 0.2

DEC 0.064 0.298 31/7 0.268 1/10 0.243 10/8 0.2

ANNUAL 

STATISTICS AVG. HIGH MONTH DATE/HOUR* 2ND HIGH MONTH DATE/HOUR* 3RD HIGH MONTH DATE/HOUR* 4TH H

0.033 0.337 Nov 20/8 0.298 Dec 31/7 0.283 Oct 28/6 0.2

* Hour Beginning

2008 ANNUAL SUMMARY

NOx (ppm) - HOURLY AVERAGES

08-31