Washoe County, Nevada

Air Quality Trends (2002-2011)

May 24, 2012

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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i

Table of Contents

Introduction......................................................................................................................................1

Pollutants..........................................................................................................................................2

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

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

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

Nitrogen Dioxide (NO2).......................................................................................................4

Sulfur Dioxide (SO2)............................................................................................................5

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

National Ambient Air Quality Standards.........................................................................................7

Ambient Air Monitoring Network...................................................................................................8

Currently Operating ...........................................................................................................10

Reno 3 (RNO) - AQS ID #32-031-0016 (SLAMS/NCore/STN) ......................................10

South Reno (SRN) - AQS ID #32-031-0020 (SLAMS)....................................................10

Galletti (GAL) - AQS ID #32-031-0022 (SLAMS) ..........................................................11

Toll (TOL) - AQS ID # 32-031-0025 (SLAMS) ...............................................................11

Plumb-Kit (PLM) - AQS ID # 32-031-0030 (SLAMS).....................................................12

Sparks (SPK) - AQS ID #32-031-1005 (SLAMS) ............................................................12

Incline (INC) - AQS ID #32-031-2002 (SLAMS).............................................................13

Lemmon Valley (LEM) - AQS ID #32-031-2009 (SLAMS)............................................13

No Longer Operating .........................................................................................................14

Reno (RNO) - AQS ID #32-031-0016 (SLAMS/SPM).....................................................14

Sun Valley (SUN) - AQS ID #32-031-2006 (SLAMS).....................................................14

Mustang (MST) - (SPM)....................................................................................................14

A Review of 2011 ..........................................................................................................................15

Current design Values and Attainment Status...............................................................................20

Ten-Year Air Quality Trend ..........................................................................................................21

PM10 (24-hour)...................................................................................................................22

PM2.5 (24-hour)..................................................................................................................23

PM2.5 (Annual)...................................................................................................................24

O3 (8-hour).........................................................................................................................25

CO (8-hour)........................................................................................................................26

CO (1-hour)........................................................................................................................27

NO2 (1-hour)......................................................................................................................28

NO2 (Annual).....................................................................................................................29

SO2 (1-hour, 24-hour, and Annual)....................................................................................30

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

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

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

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

Tables 

1. National Ambient Air Quality Standards (as of December 31, 2011) .......................................7 

2. 2011 Exceedances Summary ...................................................................................................16 

3. Design Values and Attainment Status (as of December 31, 2011) ..........................................20 

Figures 

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

2. Washoe County Ambient Air Monitoring Sites (2002-2011) ...................................................9 

3. Reno 3 Monitoring Site ............................................................................................................10 

4. South Reno Monitoring Site ....................................................................................................10 

5. Galletti Monitoring Site ...........................................................................................................11 

6. Toll Monitoring Site ................................................................................................................11 

7. Plumb-Kit Monitoring Site ......................................................................................................12 

8. Sparks Monitoring Site ............................................................................................................12 

9. Incline Monitoring Site ............................................................................................................13 

10. Lemmon Valley Monitoring Site .............................................................................................13 

11. Monthly AQI Summary for All Pollutants (2011) ...................................................................17 

12. Monthly AQI Summary of PM10 (2011) ..................................................................................18 

13. Monthly AQI Summary of PM2.5 (2011) .................................................................................18 

14. Monthly AQI Summary of O3 (2011) ......................................................................................19 

15. Monthly AQI Summary of CO (2011).....................................................................................19 

16. AQI Trend (2002-2011) ...........................................................................................................21 

17. 24-hour PM10 Concentrations (1st Highs) ................................................................................22 

18. 24-hour PM2.5 Concentrations (3-year Average of 98th Percentiles; 1st Highs; and 98th

Percentiles) ...............................................................................................................................23 

19. Annual PM2.5 Concentrations and Design Values ...................................................................24 

20. 8-hour O3 Concentrations (3-year Average of 4th Highs) ........................................................25 

21. 8-hour CO Concentrations (2nd Highs) ....................................................................................26 

22. 1-hour CO Concentrations (2nd Highs) ....................................................................................27 

23. 1-hour NO2 Concentrations (1st Highs, 98th Percentiles, and 3-Year Average of 98th

Percentiles) ...............................................................................................................................28 

24. Annual NO2 Concentrations ....................................................................................................29 

25. SO2 Concentrations (1st Highs, 99th Percentiles) .....................................................................30 

Appendices 

A. Detailed Summary of Three Most Recent Years of Data
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

CFR Code of Federal Regulations

CO Carbon Monoxide

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

μg/m3 Micrograms per Cubic Meter

mg/m3 Milligrams per Cubic Meter

NAAQS National Ambient Air Quality Standards

NCore National Core Multi-Pollutant Monitoring Station

NDEP Nevada Division of Environmental Protection

NO Nitric Acid

NO2 Nitrogen Dioxide

NOx Oxides of Nitrogen

NOy Reactive Oxides of Nitrogen

O3 Ozone

PLM Plumb-Kit

PM Particulate Matter

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

SOx Oxides of Sulfur

SPK Sparks

SPM Special Purpose Monitoring

SRN South Reno

STN Speciation Trends Network

SUN Sun Valley

TOL Toll

USG Unhealthy for Sensitive Groups

VOC Volatile Organic Compounds
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Washoe County Health District-AQMD

Air Quality Trends (2002-2011) 1 

Figure 1

State of Nevada

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 2002 and 2011 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. 
Washoe County Health District-AQMD

Air Quality Trends (2002-2011) 2

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.
Washoe County Health District-AQMD

Air Quality Trends (2002-2011) 3

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 

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.
Washoe County Health District-AQMD

Air Quality Trends (2002-2011) 4

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 (NO). 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.

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 non-white 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.
Washoe County Health District-AQMD

Air Quality Trends (2002-2011) 5

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. 

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.
Washoe County Health District-AQMD

Air Quality Trends (2002-2011) 6

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 Health District-AQMD

Air Quality Trends (2002-2011) 7

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, 2011)

Pollutant

Primary Standard Secondary Standard

Averaging

Time Concentration

Averaging

Time Concentration

PM10 24-hour 150 μg/m3 Same as primary

PM2.5

24-hour 35 μg/m3 Same as primary

Annual 15 μg/m3 Same as primary

O3 8-hour 0.075 ppm Same as primary

CO

1-hour 35 ppm None

8-hour 9 ppm None

NO2

Annual

(arithmetic mean) 0.053 ppm Same as primary

1-hour 100 ppb None

SO2 1-hour 75 ppb None

3-hour 0.5 ppm

Pb

Rolling 3-month 

average

0.15 μg/m3 Same as primary

Quarterly average

(until December 

31, 2012)

1.5 μg/m3 Same as primary
Washoe County Health District-AQMD

Air Quality Trends (2002-2011) 8

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 2002 and 2011 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 2002 and 2011. For specific details 

regarding the ambient air monitoring network, refer to the AQMD’s “2011 Ambient Air 

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

 1 40 CFR 53.

2 40 CFR 58.10.

3 40 CFR 58.
Washoe County Health District-AQMD

Air Quality Trends (2002-2011) 9

Figure 2

Washoe County Ambient Air Monitoring Sites (2002-2011)
Washoe County Health District-AQMD

Air Quality Trends (2002-2011) 10

Currently Operating

Reno 3 (RNO)

AQS ID 32-031-0016 (SLAMS/NCore/STN)

Located at 301 “A” State Street in downtown Reno, 

this site began operation in January 2002 to replace the 

Reno site. Both a residential neighborhood and a 

commercial growth area surround this site. As of 

January 1, 2011, Reno 3 became an NCore site. The 

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

Trace CO, Trace SO2, NOx, and Trace NOy. 

Meteorological parameters including ambient 

temperature, barometric pressure, relative humidity, 

wind speed, wind direction, and precipitation are also 

measured. This site is also part of EPA’s national 

Speciation Trends Network (STN). The monitoring 

objectives follow those set forth by EPA for an Ncore 

site.

South Reno (SRN)

AQS ID 32-031-0020 (SLAMS)

Located on the NV Energy property at 4110 Delucchi 

Lane in Reno, this site is in a transitional environment 

between open fields and office buildings. This site’s 

monitoring objective is population oriented for PM10,

O3, and CO.

Figure 3

Reno 3 Monitoring Site

Figure 4

South Reno Monitoring Site
Washoe County Health District-AQMD

Air Quality Trends (2002-2011) 11

Galletti (GAL)

AQS ID 32-031-0022 (SLAMS)

Located at 305 Galletti Way in Reno, this site is

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 PM10 and is population 

oriented for CO.

Toll (TOL)

AQS 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.

Figure 5

Galletti Monitoring Site

Figure 6

Toll Monitoring Site
Washoe County Health District-AQMD

Air Quality Trends (2002-2011) 12

Plumb-Kit (PLM)

AQS ID 32-031-0030 (SLAMS)

Located at 891 East Plumb Lane in Reno, this site is on 

the northeast corner of Plumb Lane and Kietzke Lane. 

This site is surrounded by both residential and 

commercial properties as well as a school. The only 

pollutant measured at this site is PM10. The

monitoring objective is population oriented for PM10.

Sparks (SPK)

AQS ID 32-031-1005 (SLAMS/SPM)

Located on US Postal Service property at 750 Fourth 

Street in Sparks, this site is surrounded by commercial 

property, a residential neighborhood, and is adjacent to 

a school. In 2007, the Sparks site was moved 

approximately 55 meters north of its previous location, 

due to tree growth affecting siting criteria. The site has 

a population oriented monitoring objective for PM10

and O3 and determines highest concentrations of CO. 

In 2011, this site began special purpose monitoring 

(SPM) for PM2.5.

Figure 8

Sparks Monitoring Site

Figure 7

Plumb-Kit Monitoring Site
Washoe County Health District-AQMD

Air Quality Trends (2002-2011) 13

Incline (INC)

AQS ID 32-031-2002 (SLAMS)

Located at 855 Alder Drive in Incline Village, this site 

is outside HA 87. It is located in a 

residential/commercial neighborhood, where the 

monitoring objective is population oriented for O3. 

The AQMD had monitored PM10 (1993-2002) and CO 

(1993-2002). This site was temporarily closed from 

December 2005 to May 2008 for building 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.

Lemmon Valley (LEM)

AQS ID 32-031-2009 (SLAMS)

Located at the Joe Mitchell Community Center at 325 

Patrician Drive in Reno, 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 population oriented.

Figure 10

Lemmon Valley Monitoring Site

Figure 9

Incline Monitoring Site
Washoe County Health District-AQMD

Air Quality Trends (2002-2011) 14

No Longer Operating

Reno (RNO)

AQS ID 32-031-0016 (SLAMS/SPM)

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)

AQS 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)

(SPM)

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 Health District-AQMD

Air Quality Trends (2002-2011) 15

A Review of 2011

The year started off with a six week dry spell in January and the first half of February. During this time, 

air stagnation resulted in three out of the four highest 24-hour PM2.5 and PM10 concentrations for the 

entire year.

Well above normal precipitation occurred from mid-February through late March. Although brief warm 

spells occurred at times in April and May, several storm systems and cold front passages occurred 

during the month of May and early June producing cool and wet conditions, with additional 

snow in the Sierra and the Lake Tahoe basin. Daytime temperatures were up to 25 degrees 

below normal during these events. By June 1, the snowpack in the Sierra was still between 220 and 

260 percent of normal, and over 450 percent of normal in the Tahoe Basin. In lower elevations, fuels 

which usually cure in the late spring were too moist to support sustained burning several weeks later than 

normal.

Warmer and drier conditions returned to the region during the last two weeks of June, when two 

8-hour ozone NAAQS exceedances occurred, on June 25 at 0.076 ppm and June 26 at 0.081 

ppm. Seven large fires occurred in July. Most of the large fires burned during the second half of 

the month, some of which were ignited by lightning.

Thunderstorms were sparse in August, dry conditions prevailed for most of the month of 

September, and two precipitation events during the first ten days of October led to the conclusion 

of the peak fire season.

A fall season which produced sparse precipitation led to very dry fuels over western Nevada. 

Although the peak fire season had ended, the most destructive fire of the year occurred on 

November 18. The “Caughlin” fire in southwest Reno began in the early morning in steep 

terrain and was driven by high wind gusts up to 70 mph which continued through the day, 

spreading the fire through a large residential area. The highest PM10 concentration of the year 

occurred on this day at 122 μg/m3

, due mainly to blowing dust and not wildfire smoke. 29

homes were destroyed with 8 additional homes damaged before this fire was contained two days 

later at 1935 acres. Another large fire burned about 2500 acres in a remote area east of Spanish 

Springs on the 23rd, but no structures were damaged by this fire.

Extremely dry conditions continued through the remainder of 2011, with much of the region 

receiving no measurable rain or snow after Thanksgiving. There was no precipitation recorded 

during the month of December in Reno, tying the driest December on record since 1870. Strong 

temperature inversions and stagnant air conditions led to a December with six days in the 

“Unhealthy for Sensitive Groups” AQI range, and our highest 24-hour PM2.5 concentration 

occurring on December 26 at 30.5 μg/m3

.

Table 2 summarizes NAAQS exceedances in 2011 by pollutant, averaging period, and dates.
Washoe County Health District-AQMD

Air Quality Trends (2002-2011) 16

Table 2

2011 Exceedances Summary 

Pollutant

Averaging

Period Exceedance Dates

PM10 24-hour None

PM2.5 24-hour None

O3 8-hour June 25 and 26

CO

1-hour None

8-hour None

NO2 1-hour None

SO2

1-hour None

3-hour None

3 h

Pb

Quarterly Not required to monitor based on 

population size and lack of significant Pb 

sources.

Rolling

3-month
Washoe County Health District-AQMD

Air Quality Trends (2002-2011) 17

Figure 11 summarizes the 2011 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). The email and hotline are updated daily, and more often during air pollution 

episodes. PM, CO, NO2, and SO2 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. Filter-based PM monitors operate 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 11-15.

Figure 11

Monthly AQI Summary for All Pollutants (2011)

* Unhealthy for Sensitive Groups

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

previous year by pollutant, month, and AQI categories.

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

Good 15 21 31 29 25 16 26 20 28 26 10 7 

Moderate 15 7 - 1 6 12 5 11 2 5 20 18 

USG* 1 - - - - 2 - - - - - 6 

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

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

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

0 

5 

10 

15 

20 

25 

30 

35 

Days per Month
Washoe County Health District-AQMD

Air Quality Trends (2002-2011) 18

Figure 12

Monthly AQI Summary of PM10 (2011)

Figure 13

Monthly AQI Summary of PM2.5 (2011)

* Unhealthy for Sensitive Groups

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

Good 17 21 31 30 31 30 31 31 30 31 25 16

Moderate 14 7 - - - - - - - - 5 15 

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

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

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

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

0 

5 

10 

15 

20 

25 

30 

35 

Days per Month

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

Good 15 25 31 29 31 30 30 31 28 26 10 7 

Moderate 15 3 - 1 - - 1 - 2 5 20 18 

USG* 1 - - - - - - - - - - 6 

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

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

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

0 

5 

10 

15 

20 

25 

30 

35 

Days per Month
Washoe County Health District-AQMD

Air Quality Trends (2002-2011) 19

Figure 14

Monthly AQI Summary of O3 (2011)

Figure 15

Monthly AQI Summary of CO (2011)

* Unhealthy for Sensitive Groups

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

Good 31 28 31 29 25 16 26 20 29 31 30 31

Moderate - - - 1 6 12 5 11 1 - - -

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

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

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

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

0 

5 

10 

15 

20 

25 

30 

35 

Days per Month

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

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

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

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

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

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

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

0 

5 

10 

15 

20 

25 

30 

35 

Days per Month
Washoe County Health District-AQMD

Air Quality Trends (2002-2011) 20 

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, 2011) 

NAAQS

Pollutant

Averaging 

Time Level Design Value Designation (Geographic Area)

PM10 24-hour 150 μg/m3

0.0 

(Expected 

Exceedances)

“Serious” Non-Attainment (HA 

87)

Unclassifiable (Remainder of 

County)

PM2.5

24-hour 35 μg/m3 25.9 μg/m3

Attainment (HA 87)

Unclassifiable / Attainment 

(Remainder of County)

Annual 15.0 μg/m3 6.9 μg/m3

Attainment (HA 87) 

Unclassifiable / Attainment 

(Remainder of County)

O3 8-hour 0.075 ppm 0.066 ppm Unclassifiable / Attainment

(Entire County)

CO

1-hour 35 ppm 3.4 ppm 

Attainment (HA 87)

Unclassifiable/ Attainment 

(Remainder of County)

8-hour 9 ppm 2.6 ppm 

Attainment (HA 87)

Unclassifiable / Attainment 

(Remainder of County)

NO2

Annual

(arithmetic 

mean)

0.053 ppm 0.017 ppm Attainment (Entire County) 

1-hour 100 ppb 60 ppb Unclassifiable / Attainment

(Entire County)

SO2 1-hour 75 ppb 6 ppb n/a (Entire County)

Promulgated in 2010.

Pb

Rolling 3-

month average 0.15 μg/m3 n/a 

Unclassifiable / Attainment

(Entire County) 

Quarterly 

Average (until 

December 31, 

2012)

1.5 μg/m3 n/a 
Washoe County Health District-AQMD

Air Quality Trends (2002-2011) 21

Ten-Year Air Quality Trend

Figure 11 summarizes the ten-year trend in AQI between 2002 and 2011. NAAQS revisions in 

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

within those ranges.

Figure 16

AQI Trend (2002-2011)

* 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/m 3

.

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.

2002 2003 2004 2005 2006 2007 2008 2009 2010 2011

Good 238 245 244 250 307 308 237 263 258 254 

Moderate 127 120 122 113 58 57 108 92 104 102 

USG* - - - 2 - - 11 8 3 9 

Unhealthy - - - - - - 9 2 - -

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

Hazardous - - - - - - - - - -

0 

50 

100 

150 

200 

250 

300 

350 

Days per Year
Washoe County Health District-AQMD

Air Quality Trends (2002-2011) 22

PM10 (24-hour)

NAAQS Level: 150 μg/m3

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

2011 Exceedances: 0

2011 Expected Exceedances: 0.0

2011 First High: 122 μg/m3 (Nov 18 - TOL)

2011 Design Value: 0.0 expected exceedances

Notes: In 2006, EPA revoked the annual NAAQS of 50 μg/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. 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” non-attainment 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 17

24-hour PM10 Concentrations (1st Highs)

2002 2003 2004 2005 2006 2007 2008 2009 2010 2011

NAAQS 150 150 150 150 150 150 150 150 150 150

0016 (RNO) 66 69 83 79 91 69 92 78 142 64

0020 (SRN) 45 61 54 71 58 75 111 59 52 64

0022 (GAL) 97 108 126 173 118 130 87 91 87 114

0025 (TOL) 57 64 64 75 47 43 64 46 34 122

0030 (PLM) 91 108 86 93 77 72

1005 (SPK) 73 85 90 72 76 76 101 67 55 77

2002 (INC) 64

2006 (SUN) 81 100 74 82

NAAQS

0

20

40

60

80

100

120

140

160

180

200

Concentration (μg/m3)
Washoe County Health District-AQMD

Air Quality Trends (2002-2011) 23 

PM2.5 (24-hour) 

NAAQS Level: 35 μg/m3

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

County) 

2011 Exceedances: 0 

2011 First High: 30.5 μg/m3 (Dec 26 - RNO)

2011 98th Percentile: 20.8 μg/m3 (Jan 6 - RNO) 

2011 Design Value: 25.9 μg/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 μg/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 18 

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

and 98th Percentiles)

2002 2003 2004 2005 2006 2007 2008 2009 2010 2011

NAAQS 65 65 65 65 35 35 35 35 35 35

0016 (RNO) 33.0 29.0 24.7 29.6 32.2 30.6 34.9 39.4 36.8 25.9

1st High 32.1 22.5 29.8 63.5 28.7 26.9 114.7 52.6 38.8 30.5

98th %tile 25.8 19.4 28.8 40.7 27.0 24.0 53.6 40.5 16.3 20.8

NAAQS (1997)

NAAQS (2006)

0 

30

60

90

120

150

Concentration (μg/m3) 
Washoe County Health District-AQMD

Air Quality Trends (2002-2011) 24

PM2.5 (Annual)

NAAQS Level: 15 μg/m3

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

County)

2011 Annual Average: 6.7 μg/m3

2011 Design Value: 6.9 μg/m3

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

retained the annual NAAQS of 15 μg/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 19

Annual PM2.5 Concentrations and Design Values

2002 2003 2004 2005 2006 2007 2008 2009 2010 2011

Annual Ave. 9.1 7.3 8.1 9.0 7.6 8.6 10.1 7.9 6.0 6.7

NAAQS 15 15 15 15 15 15 15 15 15 15

Design Value 9.4 8.9 8.2 8.1 8.2 8.2 8.6 8.7 8.1 6.9

NAAQS

0

5

10

15

20

25

30

35

Concentration (μg/m3)
Washoe County Health District-AQMD

Air Quality Trends (2002-2011) 25 

O3 (8-hour) 

NAAQS Level: 0.075 ppm 

Current Designation: Unclassifiable/Attainment (Entire County) 

2011 Exceedances: 2 (June 25 and 26 - SPK) 

2011 First High: 0.081 ppm (June 26- SPK) 

2011 Fourth High: 0.067 ppm (June 9 - SPK) 

2011 Design Value: 0.066 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 20 

8-hour O3 Concentrations (3-year Average of 4th Highs) 

2002 2003 2004 2005 2006 2007 2008 2009 2010 2011

NAAQS 0.08 0.08 0.08 0.08 0.08 0.08 0.075 0.075 0.075 0.075

0016 (REN) 0.069 0.069 0.073 0.071 0.070 0.070 0.073 0.070 0.069 0.064

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

0025 (TOL) 0.070 0.069 0.070 0.069 0.068 0.065 0.069 0.068 0.070 0.066

1005 (SPK) 0.072 0.072 0.074 0.071 0.070 0.071 0.073 0.070 0.069 0.066

2002 (INC) 0.067 0.068 0.067 0.065 0.072 0.067 0.065 0.061

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

NAAQS (1997)

NAAQS (2008)

0.055

0.060

0.065

0.070

0.075

0.080

0.085

Concentration (ppm)
Washoe County Health District-AQMD

Air Quality Trends (2002-2011) 26

CO (8-hour)

NAAQS Level: 9 ppm

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

County)

2011 Exceedances: 0

2011 First High: 3.3 ppm (Dec 19 - SPK)

2011 Second High: 2.6 ppm (Dec 11 - SPK)

2011 Design Value: 2.6 ppm

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

Figure 21

8-hour CO Concentrations (2nd Highs)

2002 2003 2004 2005 2006 2007 2008 2009 2010 2011

NAAQS 9 9 9 9 9 9 9 9 9 9

0016 (RNO) 4.0 2.6 2.5 2.9 2.6 2.2 1.6 2.1 1.8 1.4

0020 (SRN) 2.1 2.4 2.0 2.1 1.9 1.8 1.3 1.5 1.4 1.0

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

0025 (TOL) 1.1 1.2 1.1 1.8 1.4 1.2 0.9 1.4 0.9 0.8

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

2002 (INC) 1.4

2009 (LEM) 2.3 1.9 2.1 1.8 1.9 1.8 1.5 1.5 1.3 1.4

NAAQS

0

1

2

3

4

5

6

7

8

9

10

Concentration (ppm)
Washoe County Health District-AQMD

Air Quality Trends (2002-2011) 27

CO (1-hour)

NAAQS Level: 35 ppm

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

County)

2011 Exceedances: 0

2011 First High: 3.5 ppm (Dec 18 - SPK)

2011 Second High: 3.4 ppm (Dec 19 - SPK)

2011 Design Value: 3.4 ppm

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

Figure 22

1-hour CO Concentrations (2nd Highs)

2002 2003 2004 2005 2006 2007 2008 2009 2010 2011

NAAQS 35 35 35 35 35 35 35 35 35 35

0016 (RNO) 6.4 4.8 3.7 4.0 3.5 3.5 2.5 2.9 2.6 2.1

0020 (SRN) 3.1 3.1 3.1 2.5 2.5 2.2 1.7 1.9 1.9 1.5

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

0025 (TOL) 1.9 1.8 1.6 1.9 2.2 1.9 1.7 1.6 1.2 1.4

1005 (SPK) 6.7 6.1 5.8 4.4 4.5 4.7 3.8 4.2 3.1 3.4

2002 (INC) 2.0

2009 (LEM) 4.5 3.7 3.2 2.7 3.4 3.3 1.9 2.6 1.8 2.0

NAAQS

0

5

10

15

20

25

30

35

40

Concentration (ppm)
Washoe County Health District-AQMD

Air Quality Trends (2002-2011) 28

NO2 (1-hour)

NAAQS Level: 100 ppb (Promulgated in 2010)

Current Designation: Unclassifiable/Attainment (Entire County)

2011 Exceedances: 0

2011 First High: 71.1 ppb (Dec 28 - RNO)

2011 98th Percentile: 58.0 ppb (Dec 21 - RNO)

2011 Design Value: 60 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 23

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

2002 2003 2004 2005 2006 2007 2008 2009 2010 2011

NAAQS 100 100

1st High 117 80 82 125 93 72 75 96 81 71

98th %tile 50 55 58

0016 (RNO) 62 59 60

NAAQS

0

20

40

60

80

100

120

140

160

180

200

Concentration (ppb)
Washoe County Health District-AQMD

Air Quality Trends (2002-2011) 29

NO2 (Annual)

NAAQS Level: 0.053 ppm

Current Designation: Attainment

2011 Annual Average: 0.017 ppm

2011 Design Value: 0.017 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 24

Annual NO2 Concentrations

2002 2003 2004 2005 2006 2007 2008 2009 2010 2011

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

NAAQS 0.053 0.053 0.053 0.053 0.053 0.053 0.053 0.053 0.053 0.053

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)
Washoe County Health District-AQMD

Air Quality Trends (2002-2011) 30

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

2011 First High: 7.6 ppb (Jan 28 – RNO)

2011 Design Value: 6 ppb

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 25

1-hour SO2 Concentrations (1st Highs, 99th Percentiles)

2002 2003 2004 2005 2006 2007 2008 2009 2010 2011

NAAQS 75 75

1st High 5.6

0016 (RNO) 6

NAAQS

0

25

50

75

100

125

150

Concentration (ppb)
Appendix A 

Detailed Summary of Three Most Recent Years of Data 
Washoe County

Ambient Air Monitoring Data

(2011)
11-1

Pollutant Averaging Period Exceedance Dates

PM10 24-hour None

PM2.5 24-hour None

O3 8-hour June 25 and 26

1-hour None

8-hour None

NO2 1-hour None

SO2 1-hour None

3-month

quarterly

Pb n/a - Pb was not monitored in 2011

Exceedances (2011)

CO
11-2

Location:

MONTH AVG. HIGH DATE/ 

HOUR*

2ND 

HIGH

DATE/ 

HOUR*

3RD 

HIGH

DATE/ 

HOUR*

4TH 

HIGH

DATE/ 

HOUR*

JAN 0.8 1.8 28/07 1.8 29/09 1.7 8/07 1.6 22/00

FEB 0.6 1.9 5/06 1.5 4/03 1.4 11/09 1.3 7/08

MAR 0.3 1.0 1/06 0.8 2/00 0.7 17/09 0.7 4/06

APR 0.2 0.5 27/10 0.5 15/08 0.4 6/08 0.4 1/07

MAY 0.3 0.6 6/08 0.6 12/07 0.6 5/08 0.6 11/07

JUN 0.3 0.6 23/08 0.5 22/10 0.5 24/06 0.5 21/21

JUL 0.3 0.5 25/08 0.5 1/22 0.5 5/12 0.5 3/02

AUG 0.3 0.7 5/05 0.5 31/09 0.5 14/05 0.5 13/08

SEP 0.3 0.8 28/06 0.8 19/10 0.7 21/11 0.7 27/22

OCT 0.5 1.4 29/05 1.3 31/09 1.2 24/10 1.1 15/04

NOV 0.5 1.6 28/11 1.5 30/03 1.4 29/10 1.3 15/08

DEC 0.8 1.9 11/07 1.9 26/08 1.8 19/01 1.7 21/09

ANNUAL 

STATISTICS AVG. HIGH MONTH 

DATE/HOUR*

2ND 

HIGH

MONTH 

DATE/HOUR*

3RD 

HIGH

MONTH 

DATE/HOUR*

4TH 

HIGH

MONTH 

DATE/HOUR*

0.4 1.9 FEB 5/06 1.9 DEC 11/07 1.9 DEC 26/08 1.8 JAN 28/07

* Hour Beginning

2011 ANNUAL SUMMARY

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

Galletti
11-3

Location:

MONTH AVG. HIGH DATE/ 

HOUR*

2ND 

HIGH

DATE/ 

HOUR*

3RD 

HIGH

DATE/ 

HOUR*

4TH 

HIGH

DATE/ 

HOUR*

JAN 0.4 1.0 15/01 1.0 8/05 0.9 4/02 0.9 25/02

FEB 0.3 0.8 4/02 0.8 11/07 0.8 5/02 0.7 10/08

MAR 0.2 0.6 1/06 0.5 4/07 0.5 2/00 0.4 9/07

APR 0.2 0.5 1/07 0.4 4/07 0.3 27/09 0.3 6/07

MAY 0.3 0.5 11/05 0.4 30/05 0.4 1/04 0.4 2/07

JUN 0.3 0.4 3/06 0.4 17/05 0.4 9/08 0.4 10/04

JUL 0.3 0.4 27/06 0.4 29/11 0.4 2/01 0.4 22/06

AUG 0.3 0.4 16/08 0.4 29/10 0.4 26/08 0.4 9/11

SEP 0.3 0.5 10/03 0.5 29/10 0.5 3/04 0.5 23/08

OCT 0.4 0.8 28/06 0.8 29/02 0.8 31/07 0.7 27/07

NOV 0.5 1.2 11/02 1.0 9/08 1.0 10/08 1.0 8/09

DEC 0.7 1.4 11/01 1.4 24/01 1.3 25/02 1.3 14/08

ANNUAL 

STATISTICS AVG. HIGH MONTH 

DATE/HOUR*

2ND 

HIGH

MONTH 

DATE/HOUR*

3RD 

HIGH

MONTH 

DATE/HOUR*

4TH 

HIGH

MONTH 

DATE/HOUR*

0.3 1.4 DEC 11/01 1.4 DEC 24/01 1.3 DEC 25/02 1.3 DEC 14/08

* Hour Beginning

2011 ANNUAL SUMMARY

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

Lemmon Valley
11-4

Location:

MONTH AVG. HIGH DATE/ 

HOUR*

2ND 

HIGH

DATE/ 

HOUR*

3RD 

HIGH

DATE/ 

HOUR*

4TH 

HIGH

DATE/ 

HOUR*

JAN 0.548 1.373 8/10 1.289 13/11 1.222 28/12 1.197 12/23

FEB 0.379 1.108 5/08 0.952 28/00 0.857 7/11 0.810 13/08

MAR 0.246 0.618 1/04 0.563 29/10 0.532 17/09 0.519 13/10

APR 0.209 0.737 15/08 0.443 14/11 0.406 6/09 0.381 11/11

MAY 0.197 0.367 7/05 0.366 4/06 0.358 5/11 0.345 6/08

JUN 0.165 0.269 9/12 0.222 7/05 0.217 16/23 0.216 24/22

JUL 0.161 0.308 18/07 0.301 31/06 0.262 30/07 0.260 19/10

AUG 0.178 0.387 14/00 0.332 31/10 0.309 12/23 0.272 11/22

SEP 0.217 0.589 25/04 0.453 30/23 0.393 24/12 0.389 26/21

OCT 0.264 0.781 15/03 0.643 24/11 0.618 13/12 0.581 31/11

NOV 0.383 1.234 22/11 1.098 28/00 0.950 17/01 0.853 15/09

DEC 0.589 1.634 27/00 1.277 20/02 1.236 17/02 1.203 28/10

ANNUAL 

STATISTICS AVG. HIGH MONTH 

DATE/HOUR*

2ND 

HIGH

MONTH 

DATE/HOUR*

3RD 

HIGH

MONTH 

DATE/HOUR*

4TH 

HIGH

MONTH 

DATE/HOUR*

0.295 1.634 DEC 27/00 1.373 JAN 8/10 1.289 JAN 13/11 1.277 DEC 20/02

* Hour Beginning

2011 ANNUAL SUMMARY

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

Reno 3
11-5

Location:

MONTH AVG. HIGH DATE/ 

HOUR*

2ND 

HIGH

DATE/ 

HOUR*

3RD 

HIGH

DATE/ 

HOUR*

4TH 

HIGH

DATE/ 

HOUR*

JAN 0.3 1.1 13/09 0.9 8/00 0.9 12/10 0.7 22/10

FEB 0.2 0.5 3/10 0.5 4/10 0.4 5/00 0.4 7/10

MAR 0.1 0.4 31/08 0.4 9/10 0.4 17/09 0.3 1/09

APR 0.1 0.2 1/00 0.2 15/08 0.2 4/08 0.2 6/07

MAY 0.1 0.2 3/07 0.2 6/08 0.2 2/07 0.2 12/08

JUN 0.1 0.2 9/10 0.2 7/07 0.2 27/09 0.1 10/07

JUL 0.1 0.2 29/08 0.1 26/08 0.1 28/10 0.1 6/08

AUG 0.1 0.3 10/07 0.2 27/08 0.2 31/08 0.2 5/07

SEP 0.1 0.3 10/02 0.3 29/12 0.3 25/09 0.2 19/11

OCT 0.2 0.4 5/17 0.4 24/10 0.4 27/09 0.4 21/10

NOV 0.3 0.7 22/10 0.7 28/10 0.7 28/02 0.6 17/01

DEC 0.4 1.0 27/23 0.9 26/05 0.8 28/08 0.8 23/23

ANNUAL 

STATISTICS AVG. HIGH MONTH 

DATE/HOUR*

2ND 

HIGH

MONTH 

DATE/HOUR*

3RD 

HIGH

MONTH 

DATE/HOUR*

4TH 

HIGH

MONTH 

DATE/HOUR*

0.1 1.1 JAN 13/09 1.0 DEC 27/23 0.9 JAN 8/00 0.9 DEC 26/05

* Hour Beginning

2011 ANNUAL SUMMARY

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

South Reno
11-6

Location:

MONTH AVG. HIGH DATE/ 

HOUR*

2ND 

HIGH

DATE/ 

HOUR*

3RD 

HIGH

DATE/ 

HOUR*

4TH 

HIGH

DATE/ 

HOUR*

JAN 0.8 2.1 15/02 1.9 16/00 1.7 22/01 1.6 28/09

FEB 0.6 2.0 5/02 1.7 1/03 1.6 7/02 1.6 11/08

MAR 0.4 1.2 1/09 1.1 4/07 1.0 2/01 0.9 13/03

APR 0.3 0.8 1/07 0.7 6/07 0.7 12/08 0.6 4/08

MAY 0.3 0.7 1/05 0.6 11/07 0.6 5/06 0.6 20/06

JUN 0.3 0.5 20/04 0.5 3/07 0.5 10/06 0.5 21/06

JUL 0.3 0.6 2/05 0.5 29/07 0.5 28/08 0.5 21/10

AUG 0.3 0.7 14/02 0.6 28/04 0.6 30/09 0.6 29/09

SEP 0.4 1.0 4/03 0.8 3/02 0.8 30/09 0.8 18/04

OCT 0.5 1.5 24/09 1.5 29/02 1.3 28/23 1.2 30/03

NOV 0.7 2.2 30/01 2.1 11/02 2.1 17/01 1.9 28/09

DEC 1.1 3.3 19/01 2.6 11/01 2.4 21/01 2.3 24/04

ANNUAL 

STATISTICS AVG. HIGH MONTH 

DATE/HOUR*

2ND 

HIGH

MONTH 

DATE/HOUR*

3RD 

HIGH

MONTH 

DATE/HOUR*

4TH 

HIGH

MONTH 

DATE/HOUR*

0.5 3.3 DEC 19/01 2.6 DEC 11/01 2.4 DEC 21/01 2.3 DEC 24/04

* Hour Beginning

2011 ANNUAL SUMMARY

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

Sparks
11-7

Location:

MONTH AVG. HIGH DATE/ 

HOUR*

2ND 

HIGH

DATE/ 

HOUR*

3RD 

HIGH

DATE/ 

HOUR*

4TH 

HIGH

DATE/ 

HOUR*

JAN 0.4 0.8 5/13 0.8 13/09 0.8 12/10 0.7 26/11

FEB 0.4 0.7 1/09 0.7 11/10 0.6 3/08 0.6 4/10

MAR 0.4 0.7 17/10 0.6 21/09 0.6 29/11 0.6 1/11

APR 0.4 0.6 15/08 0.5 1/10 0.5 14/11 0.5 8/09

MAY 0.3 0.4 16/06 0.4 9/23 0.4 5/09 0.4 23/11

JUN 0.3 0.4 7/07 0.4 3/08 0.4 8/11 0.4 9/11

JUL 0.2 0.4 28/21 0.4 31/08 0.3 1/21 0.3 22/10

AUG 0.2 0.4 29/11 0.4 30/11 0.3 14/01 0.3 25/10

SEP 0.3 0.5 24/14 0.5 19/12 0.4 9/23 0.4 17/22

OCT 0.3 0.5 27/09 0.5 31/11 0.5 18/10 0.5 24/08

NOV 0.4 0.8 28/10 0.7 17/10 0.7 10/10 0.7 22/11

DEC 0.5 0.9 25/23 0.8 28/08 0.8 23/12 0.8 12/13

ANNUAL 

STATISTICS AVG. HIGH MONTH 

DATE/HOUR*

2ND 

HIGH

MONTH 

DATE/HOUR*

3RD 

HIGH

MONTH 

DATE/HOUR*

4TH 

HIGH

MONTH 

DATE/HOUR*

0.3 0.9 DEC 25/23 0.8 NOV 

28/10 0.8 DEC 28/08 0.8 DEC 23/12

* Hour Beginning

2011 ANNUAL SUMMARY

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

Toll
11-8

Location:

MONTH AVG. HIGH DATE/ 

HOUR*

2ND 

HIGH

DATE/ 

HOUR*

3RD 

HIGH

DATE/ 

HOUR*

4TH 

HIGH

DATE/ 

HOUR*

JAN 0.033 0.049 8/16 0.048 11/04 0.048 21/14 0.048 29/11

FEB 0.039 0.055 28/04 0.053 27/14 0.051 14/5 0.050 13/14

MAR 0.041 0.058 28/13 0.054 1/02 0.053 5/12 0.053 18/18

APR 0.041 0.063 14/11 0.057 26/13 0.057 27/09 0.056 18/02

MAY 0.043 0.062 25/06 0.060 24/13 0.060 31/20 0.059 14/20

JUN 0.040 0.077 26/10 0.068 25/18 0.063 22/19 0.062 11/15

JUL 0.035 0.056 22/09 0.054 24/14 0.053 4/13 0.052 21/11

AUG 0.038 0.063 31/09 0.062 19/12 0.059 4/10 0.059 7/10

SEP 0.037 0.064 1/18 0.058 16/00 0.057 15/23 0.056 24/13

OCT 0.030 0.051 3/22 0.050 4/00 0.048 23/15 0.047 1/09

NOV 0.033 0.052 3/02 0.050 2/23 0.048 24/03 0.047 22/03

DEC 0.032 0.048 14/14 0.048 15/00 0.047 2/13 0.046 11/12

ANNUAL 

STATISTICS AVG. HIGH MONTH 

DATE/HOUR*

2ND 

HIGH

MONTH 

DATE/HOUR*

3RD 

HIGH

MONTH 

DATE/HOUR*

4TH 

HIGH

MONTH 

DATE/HOUR*

0.024 0.077 JUN 26/10 0.068 JUN 25/18 0.064 SEP 1/18 0.063 APR 14/11

* Hour Beginning

2011 ANNUAL SUMMARY

OZONE (ppm) - ONE (1) HOUR AVERAGES

Incline
11-9

Location:

MONTH AVG. HIGH DATE/ 

HOUR*

2ND 

HIGH

DATE/ 

HOUR*

3RD 

HIGH

DATE/ 

HOUR*

4TH 

HIGH

DATE/ 

HOUR*

JAN 0.020 0.051 29/14 0.048 28/15 0.048 30/01 0.047 31/14

FEB 0.031 0.057 23/13 0.057 27/14 0.054 28/12 0.051 20/12

MAR 0.040 0.060 11/14 0.056 5/11 0.055 28/15 0.054 4/14

APR 0.043 0.069 14/13 0.062 27/13 0.060 10/13 0.060 13/13

MAY 0.044 0.069 5/20 0.067 25/08 0.064 8/12 0.064 14/20

JUN 0.044 0.079 25/17 0.077 26/13 0.072 27/10 0.070 24/14

JUL 0.041 0.072 28/16 0.071 1/16 0.063 5/12 0.063 29/12

AUG 0.044 0.072 18/14 0.071 5/13 0.071 11/12 0.068 6/13

SEP 0.034 0.066 14/16 0.062 8/13 0.061 2/15 0.061 4/17

OCT 0.026 0.055 4/02 0.054 3/22 0.052 24/13 0.051 16/05

NOV 0.026 0.053 3/16 0.050 23/22 0.048 24/10 0.047 14/14

DEC 0.018 0.046 2/13 0.046 15/00 0.043 4/14 0.043 14/23

ANNUAL 

STATISTICS AVG. HIGH MONTH 

DATE/HOUR*

2ND 

HIGH

MONTH 

DATE/HOUR*

3RD 

HIGH

MONTH 

DATE/HOUR*

4TH 

HIGH

MONTH 

DATE/HOUR*

0.034 0.079 JUN 25/17 0.077 JUN 26/13 0.072 JUN 27/10 0.072 JUL 28/16

* Hour Beginning

2011 ANNUAL SUMMARY

OZONE (ppm) - ONE (1) HOUR AVERAGES

Lemmon Valley
11-10

Location:

MONTH AVG. HIGH DATE/ 

HOUR*

2ND 

HIGH

DATE/ 

HOUR*

3RD 

HIGH

DATE/ 

HOUR*

4TH 

HIGH

DATE/ 

HOUR*

JAN 0.012 0.046 29/14 0.046 30/01 0.044 31/14 0.043 17/13

FEB 0.022 0.047 14/06 0.047 15/12 0.046 24/13 0.046 28/14

MAR 0.032 0.051 31/15 0.050 5/12 0.050 11/14 0.050 18/10

APR 0.037 0.062 14/12 0.061 27/12 0.056 10/14 0.055 12/12

MAY 0.038 0.064 24/13 0.061 14/20 0.060 8/10 0.059 25/08

JUN 0.039 0.078 26/14 0.073 25/12 0.069 9/14 0.068 14/14

JUL 0.036 0.066 28/15 0.065 21/11 0.064 3/10 0.064 4/10

AUG 0.039 0.072 20/12 0.069 31/11 0.068 12/12 0.068 26/10

SEP 0.031 0.068 20/16 0.065 1/14 0.064 8/14 0.063 17/16

OCT 0.020 0.051 3/22 0.049 4/00 0.049 20/13 0.046 1/10

NOV 0.017 0.048 3/15 0.044 24/10 0.042 14/14 0.042 23/17

DEC 0.010 0.039 15/01 0.038 2/15 0.037 16/13 0.037 30/11

ANNUAL 

STATISTICS AVG. HIGH MONTH 

DATE/HOUR*

2ND 

HIGH

MONTH 

DATE/HOUR*

3RD 

HIGH

MONTH 

DATE/HOUR*

4TH 

HIGH

MONTH 

DATE/HOUR*

0.028 0.078 JUN 26/14 0.073 JUN 25/12 0.072 AUG 

20/12 0.069 JUN 9/14

* Hour Beginning

2011 ANNUAL SUMMARY

OZONE (ppm) - ONE (1) HOUR AVERAGES

Reno 3
11-11

Location:

MONTH AVG. HIGH DATE/ 

HOUR*

2ND 

HIGH

DATE/ 

HOUR*

3RD 

HIGH

DATE/ 

HOUR*

4TH 

HIGH

DATE/ 

HOUR*

JAN 0.012 0.047 30/01 0.046 29/15 0.042 17/14 0.042 31/15

FEB 0.025 0.050 27/14 0.049 14/06 0.049 15/11 0.049 28/15

MAR 0.034 0.053 1/14 0.053 5/13 0.052 12/12 0.052 18/00

APR 0.038 0.066 14/13 0.061 27/13 0.058 10/14 0.058 12/13

MAY 0.040 0.069 24/14 0.063 14/20 0.062 8/10 0.062 25/08

JUN 0.040 0.078 26/15 0.073 25/11 0.071 9/15 0.071 14/15

JUL 0.038 0.072 21/11 0.068 12/12 0.068 28/12 0.067 4/11

AUG 0.038 0.074 31/12 0.073 6/11 0.073 20/11 0.072 22/12

SEP 0.032 0.069 20/16 0.068 19/15 0.067 2/17 0.066 1/15

OCT 0.021 0.051 3/23 0.051 19/13 0.051 20/14 0.051 22/13

NOV 0.019 0.052 3/15 0.049 23/23 0.047 24/12 0.045 14/14

DEC 0.012 0.044 30/11 0.041 15/11 0.039 2/15 0.039 16/11

ANNUAL 

STATISTICS AVG. HIGH MONTH 

DATE/HOUR*

2ND 

HIGH

MONTH 

DATE/HOUR*

3RD 

HIGH

MONTH 

DATE/HOUR*

4TH 

HIGH

MONTH 

DATE/HOUR*

0.029 0.078 JUN 26/15 0.074 AUG 

31/12 0.073 JUN 25/11 0.073 AUG 6/11

* Hour Beginning

2011 ANNUAL SUMMARY

OZONE (ppm) - ONE (1) HOUR AVERAGES

South Reno
11-12

Location:

MONTH AVG. HIGH DATE/ 

HOUR*

2ND 

HIGH

DATE/ 

HOUR*

3RD 

HIGH

DATE/ 

HOUR*

4TH 

HIGH

DATE/ 

HOUR*

JAN 0.013 0.045 17/14 0.045 31/15 0.044 22/14 0.044 29/15

FEB 0.024 0.051 27/13 0.051 28/13 0.050 15/05 0.050 20/15

MAR 0.034 0.057 11/15 0.056 31/15 0.055 5/12 0.055 27/09

APR 0.039 0.069 14/13 0.064 27/12 0.062 12/12 0.060 10/14

MAY 0.041 0.070 24/13 0.067 14/20 0.065 8/10 0.065 31/18

JUN 0.040 0.086 26/13 0.080 25/12 0.079 14/14 0.075 9/14

JUL 0.036 0.076 29/12 0.071 1/17 0.071 5/12 0.070 21/11

AUG 0.036 0.076 6/11 0.074 5/15 0.072 31/11 0.071 22/12

SEP 0.026 0.067 20/15 0.066 8/13 0.066 19/14 0.065 17/16

OCT 0.019 0.052 3/23 0.051 4/10 0.050 20/14 0.049 9/15

NOV 0.018 0.050 3/15 0.045 23/23 0.045 24/11 0.044 14/14

DEC 0.011 0.040 15/01 0.038 2/15 0.038 16/12 0.037 1/13

ANNUAL 

STATISTICS AVG. HIGH MONTH 

DATE/HOUR*

2ND 

HIGH

MONTH 

DATE/HOUR*

3RD 

HIGH

MONTH 

DATE/HOUR*

4TH 

HIGH

MONTH 

DATE/HOUR*

0.028 0.086 JUN 26/13 0.08 JUN 25/12 0.079 JUN 14/14 0.076 JUL 29/12

* Hour Beginning

2011 ANNUAL SUMMARY

OZONE (ppm) - ONE (1) HOUR AVERAGES

Sparks
11-13

Location:

MONTH AVG. HIGH DATE/ 

HOUR*

2ND 

HIGH

DATE/ 

HOUR*

3RD 

HIGH

DATE/ 

HOUR*

4TH 

HIGH

DATE/ 

HOUR*

JAN 0.017 0.048 29/14 0.048 30/01 0.040 13/10 0.040 31/13

FEB 0.031 0.053 28/03 0.051 27/15 0.050 14/06 0.049 13/14

MAR 0.038 0.058 11/14 0.055 27/09 0.053 5/11 0.053 18/11

APR 0.039 0.067 14/13 0.060 18/02 0.059 27/13 0.057 13/13

MAY 0.042 0.066 24/13 0.064 14/21 0.062 8/10 0.062 22/11

JUN 0.041 0.074 26/15 0.073 25/11 0.071 15/13 0.071 20/15

JUL 0.038 0.071 12/16 0.066 21/11 0.063 4/11 0.063 5/12

AUG 0.038 0.070 31/13 0.067 6/12 0.066 11/12 0.065 7/11

SEP 0.033 0.062 19/15 0.061 1/16 0.060 8/15 0.060 14/15

OCT 0.025 0.051 4/10 0.050 3/23 0.049 19/13 0.049 24/14

NOV 0.024 0.051 3/14 0.047 24/10 0.046 23/19 0.044 18/13

DEC 0.018 0.044 15/02 0.043 30/11 0.038 2/20 0.037 5/14

ANNUAL 

STATISTICS AVG. HIGH MONTH 

DATE/HOUR*

2ND 

HIGH

MONTH 

DATE/HOUR*

3RD 

HIGH

MONTH 

DATE/HOUR*

4TH 

HIGH

MONTH 

DATE/HOUR*

0.032 0.074 JUN 26/15 0.073 JUN 25/11 0.071 JUN 15/13 0.071 JUN 20/15

* Hour Beginning

2011 ANNUAL SUMMARY

OZONE (ppm) - ONE (1) HOUR AVERAGES

Toll
11-14

Location:

MONTH AVG. HIGH DATE/ 

HOUR*

2ND 

HIGH

DATE/ 

HOUR*

3RD 

HIGH

DATE/ 

HOUR*

4TH 

HIGH

DATE/ 

HOUR*

JAN 0.032 0.046 29/17 0.043 31/08 0.042 9/08 0.042 11/00

FEB 0.039 0.057 22/10 0.050 27/09 0.049 28/00 0.048 14/02

MAR 0.040 0.054 28/09 0.051 18/17 0.049 5/08 0.049 17/22

APR 0.040 0.062 14/10 0.053 12/21 0.053 26/08 0.053 27/07

MAY 0.042 0.058 25/05 0.058 31/15 0.056 8/03 0.056 24/07

JUN 0.039 0.068 26/09 0.064 25/09 0.058 11/10 0.056 27/18

JUL 0.035 0.053 22/08 0.050 24/10 0.049 4/10 0.049 21/09

AUG 0.038 0.059 31/08 0.055 19/08 0.053 7/08 0.053 18/22

SEP 0.036 0.057 1/11 0.053 15/17 0.051 2/13 0.051 3/10

OCT 0.030 0.048 3/20 0.044 24/10 0.043 4/00 0.042 1/19

NOV 0.033 0.050 2/23 0.049 3/00 0.045 21/23 0.045 23/20

DEC 0.031 0.044 2/07 0.044 14/21 0.042 15/18 0.041 1/16

ANNUAL 

STATISTICS AVG. HIGH MONTH 

DATE/HOUR*

2ND 

HIGH

MONTH 

DATE/HOUR*

3RD 

HIGH

MONTH 

DATE/HOUR*

4TH 

HIGH

MONTH 

DATE/HOUR*

0.036 0.068 JUN 26/09 0.064 JUN 25/09 0.062 APR 14/10 0.059 AUG 

31/08

* Hour Beginning

2011 ANNUAL SUMMARY

OZONE (ppm) - EIGHT (8) HOUR AVERAGES

Incline
11-15

Location:

MONTH AVG. HIGH DATE/ 

HOUR*

2ND 

HIGH

DATE/ 

HOUR*

3RD 

HIGH

DATE/ 

HOUR*

4TH 

HIGH

DATE/ 

HOUR*

JAN 0.019 0.045 29/10 0.042 17/10 0.042 30/09 0.042 31/11

FEB 0.031 0.051 27/10 0.051 28/09 0.05 23/11 0.049 22/10

MAR 0.040 0.056 11/11 0.053 22/09 0.052 5/06 0.052 16/09

APR 0.042 0.065 14/11 0.059 27/11 0.056 12/11 0.056 13/07

MAY 0.044 0.063 8/08 0.062 25/07 0.061 5/15 0.060 4/08

JUN 0.043 0.075 25/10 0.072 26/10 0.068 24/10 0.066 11/12

JUL 0.041 0.063 28/10 0.061 1/11 0.058 12/09 0.057 5/10

AUG 0.044 0.064 6/09 0.064 19/10 0.063 18/11 0.063 31/09

SEP 0.033 0.059 14/10 0.057 15/10 0.056 2/11 0.056 7/10

OCT 0.026 0.052 3/20 0.050 4/00 0.049 24/10 0.047 15/23

NOV 0.025 0.051 3/12 0.046 23/20 0.046 24/03 0.044 22/08

DEC 0.018 0.042 2/12 0.042 14/23 0.041 15/00 0.038 4/11

ANNUAL 

STATISTICS AVG. HIGH MONTH 

DATE/HOUR*

2ND 

HIGH

MONTH 

DATE/HOUR*

3RD 

HIGH

MONTH 

DATE/HOUR*

4TH 

HIGH

MONTH 

DATE/HOUR*

0.034 0.075 JUN 25/10 0.072 JUN 26/10 0.068 JUN 24/10 0.066 JUN 11/12

* Hour Beginning

2011 ANNUAL SUMMARY

OZONE (ppm) - EIGHT (8) HOUR AVERAGES

Lemmon Valley
11-16

Location:

MONTH AVG. HIGH DATE/ 

HOUR*

2ND 

HIGH

DATE/ 

HOUR*

3RD 

HIGH

DATE/ 

HOUR*

4TH 

HIGH

DATE/ 

HOUR*

JAN 0.011 0.040 29/22 0.033 31/11 0.032 9/11 0.031 19/08

FEB 0.022 0.045 15/08 0.043 14/22 0.043 15/16 0.043 24/08

MAR 0.032 0.048 18/08 0.046 12/10 0.046 16/09 0.046 19/09

APR 0.036 0.056 14/11 0.055 27/09 0.051 10/09 0.050 6/10

MAY 0.038 0.058 8/08 0.058 24/10 0.054 4/09 0.054 25/08

JUN 0.039 0.073 26/10 0.069 25/09 0.062 9/11 0.062 11/10

JUL 0.036 0.060 28/10 0.055 1/11 0.055 5/08 0.055 21/08

AUG 0.039 0.064 20/09 0.062 19/09 0.061 6/09 0.061 21/09

SEP 0.030 0.055 14/11 0.055 17/11 0.054 1/11 0.054 8/10

OCT 0.020 0.048 3/21 0.041 4/08 0.041 20/11 0.040 9/11

NOV 0.017 0.046 3/09 0.041 24/05 0.040 23/13 0.039 18/03

DEC 0.009 0.033 2/14 0.032 1/09 0.032 15/08 0.032 16/09

ANNUAL 

STATISTICS AVG. HIGH MONTH 

DATE/HOUR*

2ND 

HIGH

MONTH 

DATE/HOUR*

3RD 

HIGH

MONTH 

DATE/HOUR*

4TH 

HIGH

MONTH 

DATE/HOUR*

0.027 0.073 JUN 26/10 0.069 JUN 25/09 0.064 AUG 

20/09 0.062 JUN 9/11

* Hour Beginning

2011 ANNUAL SUMMARY

OZONE (ppm) - EIGHT (8) HOUR AVERAGES

Reno 3
11-17

Location:

MONTH AVG. HIGH DATE/ 

HOUR*

2ND 

HIGH

DATE/ 

HOUR*

3RD 

HIGH

DATE/ 

HOUR*

4TH 

HIGH

DATE/ 

HOUR*

JAN 0.011 0.041 29/23 0.032 1/10 0.032 9/12 0.031 31/10

FEB 0.025 0.048 15/11 0.046 14/04 0.046 15/03 0.046 15/19

MAR 0.034 0.050 18/07 0.049 19/08 0.049 22/08 0.048 5/09

APR 0.037 0.060 14/09 0.055 27/10 0.054 10/09 0.053 6/10

MAY 0.040 0.061 24/10 0.060 8/08 0.058 25/07 0.058 31/17

JUN 0.039 0.073 26/10 0.070 25/09 0.064 9/10 0.063 11/10

JUL 0.037 0.065 28/11 0.062 21/08 0.060 12/10 0.059 22/10

AUG 0.037 0.067 20/08 0.066 6/08 0.064 31/09 0.063 19/09

SEP 0.031 0.060 14/10 0.059 1/11 0.058 8/10 0.058 17/11

OCT 0.021 0.045 4/08 0.044 3/20 0.044 11/08 0.044 24/11

NOV 0.019 0.050 3/12 0.046 23/16 0.044 18/09 0.042 24/10

DEC 0.011 0.039 30/06 0.036 15/09 0.036 16/09 0.034 2/14

ANNUAL 

STATISTICS AVG. HIGH MONTH 

DATE/HOUR*

2ND 

HIGH

MONTH 

DATE/HOUR*

3RD 

HIGH

MONTH 

DATE/HOUR*

4TH 

HIGH

MONTH 

DATE/HOUR*

0.028 0.073 JUN 26/10 0.070 JUN 25/09 0.067 AUG 

20/08 0.066 AUG 6/08

* Hour Beginning

2011 ANNUAL SUMMARY

OZONE (ppm) - EIGHT (8) HOUR AVERAGES

South Reno
11-18

Location:

MONTH AVG. HIGH DATE/ 

HOUR*

2ND 

HIGH

DATE/ 

HOUR*

3RD 

HIGH

DATE/ 

HOUR*

4TH 

HIGH

DATE/ 

HOUR*

JAN 0.012 0.038 30/09 0.035 17/11 0.034 9/10 0.034 22/10

FEB 0.023 0.049 15/04 0.048 14/20 0.048 15/12 0.047 24/09

MAR 0.033 0.052 18/06 0.051 19/09 0.050 5/08 0.050 12/09

APR 0.038 0.062 14/11 0.058 27/10 0.056 10/10 0.056 12/10

MAY 0.040 0.064 24/10 0.063 8/06 0.062 4/09 0.060 31/11

JUN 0.039 0.081 26/10 0.076 25/10 0.068 11/10 0.067 9/10

JUL 0.036 0.063 28/10 0.062 29/09 0.061 21/09 0.060 1/11

AUG 0.036 0.066 6/09 0.064 20/09 0.063 19/10 0.063 21/09

SEP 0.026 0.057 8/10 0.056 1/11 0.056 15/09 0.055 2/11

OCT 0.018 0.043 3/19 0.043 4/07 0.042 24/11 0.041 9/10

NOV 0.018 0.048 3/10 0.040 23/16 0.040 24/11 0.039 14/09

DEC 0.010 0.036 15/08 0.035 1/11 0.033 2/15 0.033 16/09

ANNUAL 

STATISTICS AVG. HIGH MONTH 

DATE/HOUR*

2ND 

HIGH

MONTH 

DATE/HOUR*

3RD 

HIGH

MONTH 

DATE/HOUR*

4TH 

HIGH

MONTH 

DATE/HOUR*

0.027 0.081 JUN 26/10 0.076 JUN 25/10 0.068 JUN 11/10 0.067 JUN 9/10

* Hour Beginning

2011 ANNUAL SUMMARY

OZONE (ppm) - EIGHT (8) HOUR AVERAGES

Sparks
11-19

Location:

MONTH AVG. HIGH DATE/ 

HOUR*

2ND 

HIGH

DATE/ 

HOUR*

3RD 

HIGH

DATE/ 

HOUR*

4TH 

HIGH

DATE/ 

HOUR*

JAN 0.016 0.045 29/14 0.043 30/00 0.034 1/10 0.033 3/10

FEB 0.030 0.049 28/09 0.047 15/06 0.047 15/14 0.047 24/10

MAR 0.037 0.052 11/11 0.051 18/06 0.050 5/11 0.050 18/17

APR 0.038 0.062 14/11 0.055 13/12 0.054 27/11 0.053 12/10

MAY 0.042 0.060 8/05 0.060 24/09 0.059 22/10 0.059 25/07

JUN 0.040 0.072 26/10 0.069 25/09 0.065 15/10 0.064 22/18

JUL 0.038 0.061 12/10 0.060 21/08 0.058 20/11 0.058 28/10

AUG 0.037 0.062 31/09 0.061 11/09 0.060 6/09 0.059 20/08

SEP 0.033 0.055 14/11 0.054 1/11 0.053 8/10 0.052 15/11

OCT 0.025 0.047 24/10 0.044 3/20 0.044 4/09 0.042 11/08

NOV 0.024 0.048 3/05 0.044 23/16 0.044 23/16 0.041 18/01

DEC 0.017 0.039 30/06 0.035 15/10 0.035 16/09 0.034 2/13

ANNUAL 

STATISTICS AVG. HIGH MONTH 

DATE/HOUR*

2ND 

HIGH

MONTH 

DATE/HOUR*

3RD 

HIGH

MONTH 

DATE/HOUR*

4TH 

HIGH

MONTH 

DATE/HOUR*

0.031 0.072 JUN 26/10 0.069 JUN 25/09 0.065 JUN 15/10 0.064 JUN 22/18

* Hour Beginning

2011 ANNUAL SUMMARY

OZONE (ppm) - EIGHT (8) HOUR AVERAGES

Toll
11-20

Location:

MONTH AVG. HIGH DATE 2ND 

HIGH DATE 3RD HIGH DATE 4TH HIGH DATE

JAN 13.1 26.2 6 20.9 12 16.1 15 14.7 24

FEB 6.0 10.7 5 9.1 2 8.4 11 7.7 20

MAR 3.6 10.2 1 5.2 31 4.3 4 4.2 13

APR 3.7 7.9 15 6.1 12 3.9 27 3.8 9

MAY 3.5 6.7 6 4.6 21 4.5 24 4.4 3

JUN 3.8 5.9 11 5.8 14 5.1 26 4.2 8

JUL 5.0 10.6 29 6.5 23 5.4 5 4.9 8

AUG 5.0 7.6 1 7.1 25 6.2 4 5.6 31

SEP 6.9 14.7 9 8.5 30 7.2 15 7.0 12

OCT 5.6 7.9 30 7.7 12 7.4 21 7.0 27

NOV 8.5 14.1 20 11.2 29 9.8 26 8.9 8

DEC 14.1 29.7 26 19.6 14 16.3 11 15.9 23

ANNUAL 

STATISTICS AVG. HIGH MONTH/ 

DAY

2ND 

HIGH

MONTH/ 

DAY

3RD 

HIGH

MONTH/ 

DAY

4TH 

HIGH

MONTH/ 

DAY

6.6 29.7 DEC 26 26.2 JAN 6 20.9 JAN 12 19.6 DEC 14

2011 ANNUAL SUMMARY

PM2.5 (μg/m3) - 24 HOUR AVERAGES

Reno 3 Designated
11-21

Location:

MONTH AVG. HIGH DATE 2ND 

HIGH DATE 3RD HIGH DATE 4TH HIGH DATE

JAN 13.3 26.9 6 20.6 12 16.3 15 13.9 21

FEB 6.0 10.9 5 9.1 2 8.7 11 7.5 20

MAR 3.5 10.7 1 4.2 13 4.1 4 3.9 22

APR 4.0 7.7 15 7.5 12 4.0 27 3.8 9

MAY 3.5 6.8 6 4.9 21 4.6 24 4.4 3

JUN 4.0 5.8 11 5.8 14 4.1 23 3.8 26

JUL 5.1 10.6 29 6.2 23 5.6 5 4.9 8

AUG 5.0 7.7 1 7.0 25 6.2 4 5.2 22

SEP 7.8 14.9 9 8.6 30 7.0 12 6.2 24

OCT 5.6 7.9 30 7.7 12 7.4 27 7.3 21

NOV 8.3 13.7 20 11.3 29 9.5 26 9.2 8

DEC 14.4 30.5 26 19.4 14 16.2 11 15.7 23

ANNUAL 

STATISTICS AVG. HIGH MONTH/ 

DAY

2ND 

HIGH

MONTH/ 

DAY

3RD 

HIGH

MONTH/ 

DAY

4TH 

HIGH

MONTH/ 

DAY

6.7 30.5 DEC 26 26.9 JAN 6 20.6 JAN 12 19.4 DEC 14

2011 ANNUAL SUMMARY

PM2.5 (μg/m3) - 24 HOUR AVERAGES

Reno 3 Collocated
11-22

Location:

MONTH AVG. HIGH DATE 2ND 

HIGH DATE 3RD HIGH DATE 4TH HIGH DATE

JAN 13 30 8 28 6 28 7 23 5

FEB 7 17 27 14 5 12 3 12 4

MAR 4 12 1 11 9 7 4 7 5

APR 4 15 14 11 15 9 11 9 12

MAY 4 7 5 7 14 6 31 5 1

JUN 4 10 9 8 14 7 10 7 26

JUL 6 13 28 13 29 9 31 7 1

AUG 6 10 1 9 26 9 27 8 4

SEP 7 17 9 15 10 9 30 8 2

OCT 6 14 29 12 28 11 20 9 19

NOV 7 16 27 13 10 12 20 11 13

DEC 12 29 26 25 25 19 24 17 10

ANNUAL 

STATISTICS AVG. HIGH MONTH/ 

DAY

2ND 

HIGH

MONTH/ 

DAY

3RD 

HIGH

MONTH/ 

DAY

4TH 

HIGH

MONTH/ 

DAY

6.7 30 JAN 8 29 DEC 26 28 JAN 6 28 JAN 7

2011 ANNUAL SUMMARY

Continuous PM2.5 (μg/m3) - 24 HOUR AVERAGES

Reno 3 BAM
11-23

Location:

MONTH AVG. HIGH DATE 2ND 

HIGH DATE 3RD HIGH DATE 4TH HIGH DATE

JAN 71 114 21 91 27 75 15 50 3

FEB 58 83 14 62 2 46 8 40 20

MAR 44 112 10 42 4 37 28 17 22

APR 20 36 15 26 27 13 3 12 9

MAY 15 26 3 14 21 13 27 12 9

JUN 22 30 20 26 8 24 14 18 26

JUL 25 36 26 28 20 25 8 20 14

AUG 29 35 31 34 19 34 25 29 1

SEP 33 48 30 34 24 28 18 27 6

OCT 36 58 24 48 18 37 12 30 30

NOV 38 63 29 51 17 31 11 27 23

DEC 41 60 23 52 11 43 17 25 5

ANNUAL 

STATISTICS AVG. HIGH MONTH/ 

DAY

2ND 

HIGH

MONTH/ 

DAY

3RD 

HIGH

MONTH/ 

DAY

4TH 

HIGH

MONTH/ 

DAY

35.4 114 JAN 21 112 MAR 10 91 JAN 27 83 FEB 14

2011 ANNUAL SUMMARY

PM10 (μg/m3) - 24 HOUR AVERAGES

Galletti
11-24

Location:

MONTH AVG. HIGH DATE 2ND 

HIGH DATE 3RD HIGH DATE 4TH HIGH DATE

JAN 45 64 21 61 15 47 27 33 3

FEB 37 50 2 49 14 42 20 30 8

MAR 20 33 10 22 4 19 22 17 28

APR 14 25 15 14 27 11 9 10 3

MAY 10 16 3 13 21 8 9 7 15

JUN 15 19 14 16 26 16 8 15 20

JUL 14 16 8 15 26 15 14 12 2

AUG 18 23 1 22 25 19 31 17 19

SEP 22 43 30 19 18 19 24 15 6

OCT 22 34 24 28 30 24 12 17 18

NOV* 18 18 5

DEC

ANNUAL 

STATISTICS AVG. HIGH MONTH/ 

DAY

2ND 

HIGH

MONTH/ 

DAY

3RD 

HIGH

MONTH/ 

DAY

4TH 

HIGH

MONTH/ 

DAY

21.5 64 JAN 21 61 JAN 15 50 FEB 2 49 FEB 14

*PM10 FRM sampler replaced by continuous PM10 FEM monitor on November 11, 2011

2011 ANNUAL SUMMARY

PM10 (μg/m3) - 24 HOUR AVERAGES

Plumb-Kit
11-25

Location:

MONTH AVG. HIGH DATE 2ND 

HIGH DATE 3RD HIGH DATE 4TH HIGH DATE

JAN

FEB

MAR

APR

MAY

JUN

JUL

AUG

SEP

OCT

NOV* 29 59 18 43 27 42 28 42 29

DEC 41 72 26 58 24 58 25 57 27

ANNUAL 

STATISTICS AVG. HIGH MONTH/ 

DAY

2ND 

HIGH

MONTH/ 

DAY

3RD 

HIGH

MONTH/ 

DAY

4TH 

HIGH

MONTH/ 

DAY

36.3 72 DEC 26 59 NOV 18 58 DEC 24 58 DEC 25

*Continuous PM10 FEM monitor replaced PM10 FRM sampler on November 11, 2011

2011 ANNUAL SUMMARY

Continuous PM10 (μg/m3) - 24 HOUR AVERAGES

Plumb-Kit BAM
11-26

Location:

MONTH AVG. HIGH DATE 2ND 

HIGH DATE 3RD HIGH DATE 4TH HIGH DATE

JAN 40.3 64.4 12 52.3 21 51.2 6 50.2 15

FEB 22.0 36.0 5 35.7 2 29.3 11 21.7 20

MAR 14.3 39.1 1 24.3 31 19.0 10 16.2 4

APR 10.8 22.7 15 19.2 12 14.1 6 9.7 27

MAY 9.2 20.7 6 12.9 3 11.8 12 10.8 21

JUN 9.6 13.7 14 12.2 17 12.2 23 11.9 26

JUL 14.2 31.2 29 15.7 5 15.3 23 13.2 26

AUG 14.6 21.1 31 19.8 1 19.7 25 16.2 4

SEP 19.3 34.6 9 26.8 30 21.9 24 20.5 15

OCT 16.0 25.6 24 21.3 21 21.3 27 20.9 12

NOV 19.1 26.3 29 23.0 11 21.8 20 21.2 26

DEC 32.5 57.7 26 44.4 14 36.2 23 29.9 20

ANNUAL 

STATISTICS AVG. HIGH MONTH/ 

DAY

2ND 

HIGH

MONTH/ 

DAY

3RD 

HIGH

MONTH/ 

DAY

4TH 

HIGH

MONTH/ 

DAY

18.2 64.4 JAN 12 57.7 DEC 26 52.3 JAN 21 51.2 JAN 6

2011 ANNUAL SUMMARY

PM10 (μg/m3) - 24 HOUR AVERAGES

Reno 3
11-27

Location:

MONTH AVG. HIGH DATE 2ND 

HIGH DATE 3RD HIGH DATE 4TH HIGH DATE

JAN 34 59 12 57 8 49 7 49 21

FEB 23 55 1 41 27 40 2 39 5

MAR 12 35 1 34 9 25 31 20 10

APR 11 31 14 23 15 22 4 19 12

MAY 9 22 14 18 5 18 6 16 25

JUN 9 18 18 15 9 15 22 15 28

JUL 13 26 29 22 28 19 30 17 6

AUG 13 19 31 18 25 18 26 17 1

SEP 17 30 9 26 10 25 30 22 24

OCT 15 27 24 24 28 24 29 22 27

NOV 18 39 3 30 27 29 28 28 10

DEC 30 55 21 55 26 40 14 40 25

ANNUAL 

STATISTICS AVG. HIGH MONTH/ 

DAY

2ND 

HIGH

MONTH/ 

DAY

3RD 

HIGH

MONTH/ 

DAY

4TH 

HIGH

MONTH/ 

DAY

17.0 59 JAN 12 57 JAN 8 55 FEB 1 55 DEC 21

2011 ANNUAL SUMMARY

Continuous PM10 (μg/m3) - 24 HOUR AVERAGES

Reno 3 BAM
11-28

Location:

MONTH AVG. HIGH DATE 2ND 

HIGH DATE 3RD HIGH DATE 4TH HIGH DATE

JAN 38 54 21 41 27 33 15 23 3

FEB 30 35 2 35 14 31 20 20 8

MAR 26 64 28 24 4 21 10 14 22

APR 11 21 15 13 27 8 9 8 3

MAY 10 20 21 13 3 7 9 7 27

JUN 14 20 14 16 20 14 26 11 8

JUL 14 19 26 13 20 13 8 12 2

AUG 16 23 25 19 31 17 19 14 1

SEP 22 34 12 25 30 20 24 17 18

OCT* 19 20 18 19 24 18 12

NOV

DEC

ANNUAL 

STATISTICS AVG. HIGH MONTH/ 

DAY

2ND 

HIGH

MONTH/ 

DAY

3RD 

HIGH

MONTH/ 

DAY

4TH 

HIGH

MONTH/ 

DAY

19.3 64 MAR 28 54 JAN 21 41 JAN 27 35 FEB 2

*PM10 FRM sampler replaced by continuous PM10 FEM monitor on October 28, 2011

2011 ANNUAL SUMMARY

PM10 (μg/m3) - 24 HOUR AVERAGES

South Reno
11-29

Location:

MONTH AVG. HIGH DATE 2ND 

HIGH DATE 3RD HIGH DATE 4TH HIGH DATE

JAN

FEB

MAR

APR

MAY

JUN

JUL

AUG

SEP

OCT* 22 24 28 24 31 23 29 18 30

NOV 21 59 18 52 3 30 28 28 29

DEC 27 43 26 40 14 40 23 36 27

ANNUAL 

STATISTICS AVG. HIGH MONTH/ 

DAY

2ND 

HIGH

MONTH/ 

DAY

3RD 

HIGH

MONTH/ 

DAY

4TH 

HIGH

MONTH/ 

DAY

23.9 59 NOV 18 52 NOV 23 43 DEC 26 40 DEC 14

*Continuous PM10 FEM monitor replaced PM10 FRM sampler on October 28, 2011

2011 ANNUAL SUMMARY

Continuous PM10 (μg/m3) - 24 HOUR AVERAGES

South Reno BAM
11-30

Location:

MONTH AVG. HIGH DATE 2ND 

HIGH DATE 3RD HIGH DATE 4TH HIGH DATE

JAN 42 62 15 61 21 41 27 24 9

FEB 34 62 14 35 2 30 20 26 8

MAR 20 45 10 18 22 10 28 6 16

APR 11 20 15 12 27 9 9 7 21

MAY 8 13 21 9 3 7 27 6 15

JUN 13 18 14 17 20 14 26 12 8

JUL 15 17 8 16 20 16 26 14 2

AUG 19 24 31 23 25 22 19 18 1

SEP 26 38 30 27 24 24 6 22 18

OCT 26 35 30 34 24 28 12 25 18

NOV 32 54 29 33 11 29 17 22 5

DEC 35 55 23 52 11 35 17 21 5

ANNUAL 

STATISTICS AVG. HIGH MONTH/ 

DAY

2ND 

HIGH

MONTH/ 

DAY

3RD 

HIGH

MONTH/ 

DAY

4TH 

HIGH

MONTH/ 

DAY

23.3 62 JAN 15 62 FEB 14 61 JAN 21 55 DEC 23

2011 ANNUAL SUMMARY

PM10 (μg/m3) - 24 HOUR AVERAGES

Sparks Designated
11-31

Location:

MONTH AVG. HIGH DATE 2ND 

HIGH DATE 3RD HIGH DATE 4TH HIGH DATE

JAN 42 62 21 62 15 42 27 23 9

FEB 37 77 14 32 20 26 8 13 26

MAR 16 29 10 28 4 10 28 7 16

APR 11 20 15 12 27 9 9 7 21

MAY 8 13 21 11 3 7 27 6 9

JUN 14 18 14 17 20 15 26 13 8

JUL 15 17 8 16 26 16 2 15 20

AUG 19 23 25 22 31 22 19 19 1

SEP 26 37 30 27 24 25 6 22 18

OCT 26 35 30 35 24 29 12 27 18

NOV 31 55 29 33 11 28 17 20 5

DEC 36 56 23 54 11 34 17 22 5

ANNUAL 

STATISTICS AVG. HIGH MONTH/ 

DAY

2ND 

HIGH

MONTH/ 

DAY

3RD 

HIGH

MONTH/ 

DAY

4TH 

HIGH

MONTH/ 

DAY

23.2 77 FEB 14 62 JAN 21 62 JAN 15 56 DEC 23

2011 ANNUAL SUMMARY

PM10 (μg/m3) - 24 HOUR AVERAGES

Sparks Collocated
11-32

Location:

MONTH AVG. HIGH DATE 2ND 

HIGH DATE 3RD HIGH DATE 4TH HIGH DATE

JAN

FEB

MAR

APR

MAY

JUN

JUL* 18 34 29 24 28 17 23 16 27

AUG 15 19 24 19 25 18 3 18 27

SEP 21 38 30 37 9 32 10 29 29

OCT 20 41 28 37 29 33 30 32 24

NOV 27 69 3 49 29 46 10 45 16

DEC 40 67 18 60 25 58 7 58 10

ANNUAL 

STATISTICS AVG. HIGH MONTH/ 

DAY

2ND 

HIGH

MONTH/ 

DAY

3RD 

HIGH

MONTH/ 

DAY

4TH 

HIGH

MONTH/ 

DAY

24.2 69 NOV 3 67 DEC 18 60 DEC 25 58 DEC 7

*Continuous PM10 FEM monitor online July 23, 2011

2011 ANNUAL SUMMARY

Continuous PM10 (μg/m3) - 24 HOUR AVERAGES

Sparks BAM
11-33

Location:

MONTH AVG. HIGH DATE 2ND 

HIGH DATE 3RD HIGH DATE 4TH HIGH DATE

JAN 25 38 21 27 27 24 15 18 9

FEB 31 65 14 31 2 22 8 21 20

MAR 15 23 10 20 28 14 22 13 4

APR 13 24 15 15 27 10 3 9 9

MAY 9 15 3 11 21 7 9 6 27

JUN 11 14 14 14 26 13 20 10 8

JUL 15 17 20 16 8 16 26 15 14

AUG 20 27 25 26 31 25 19 17 1

SEP 23 38 24 29 30 18 6 16 12

OCT* 12 18 12 6 6

NOV

DEC

ANNUAL 

STATISTICS AVG. HIGH MONTH/ 

DAY

2ND 

HIGH

MONTH/ 

DAY

3RD 

HIGH

MONTH/ 

DAY

4TH 

HIGH

MONTH/ 

DAY

17.8 65 FEB 14 38 JAN 21 38 SEP 24 31 FEB 2

*PM10 FRM sampler replaced by continuous PM10 FEM monitor on October 15, 2011

2011 ANNUAL SUMMARY

PM10 (μg/m3) - 24 HOUR AVERAGES

Toll
11-34

Location:

MONTH AVG. HIGH DATE 2ND 

HIGH DATE 3RD HIGH DATE 4TH HIGH DATE

JAN

FEB

MAR

APR

MAY

JUN

JUL

AUG

SEP

OCT* 21 38 31 36 30 34 29 32 28

NOV 19 122 18 61 30 29 17 26 29

DEC 24 42 30 34 23 34 26 33 7

ANNUAL 

STATISTICS AVG. HIGH MONTH/ 

DAY

2ND 

HIGH

MONTH/ 

DAY

3RD 

HIGH

MONTH/ 

DAY

4TH 

HIGH

MONTH/ 

DAY

21.4 122 NOV 18 61 NOV 30 42 DEC 30 38 OCT 31

*Continuous PM10 FEM monitor replaced PM10 FRM sampler on October 15, 2011

2011 ANNUAL SUMMARY

Continuous PM10 (μg/m3) - 24 HOUR AVERAGES

Toll BAM
11-35

Location:

MONTH AVG. HIGH DATE 2ND 

HIGH DATE 3RD HIGH DATE 4TH HIGH DATE

JAN 24.2 38.8 12 34.6 21 30.4 24 30.0 15

FEB 14.3 24.7 2 22.4 5 18.6 11 16.4 14

MAR 9.3 25.7 1 16.4 31 13.1 10 10.6 4

APR 6.0 12.5 15 11.2 12 9.3 6 4.8 27

MAY 4.6 11.3 6 7.1 3 6.7 12 4.8 21

JUN 4.6 6.8 17 6.4 23 6.1 20 6.0 14

JUL 7.1 15.8 29 7.9 5 7.1 26 5.9 11

AUG 7.4 12.0 31 9.3 1 9.2 25 8.1 22

SEP 9.8 15.1 9 14.7 30 12.9 24 10.5 15

OCT 8.7 15.6 24 12.5 27 11.6 21 10.8 12

NOV 9.0 13.0 29 12.1 2 12.0 11 9.9 26

DEC 16.6 24.2 26 21.6 14 18.9 23 17.0 2

ANNUAL 

STATISTICS AVG. HIGH MONTH/ 

DAY

2ND 

HIGH

MONTH/ 

DAY

3RD 

HIGH

MONTH/ 

DAY

4TH 

HIGH

MONTH/ 

DAY

10.0 38.8 JAN 12 34.6 JAN 21 30.4 JAN 24 30.0 JAN 15

2011 ANNUAL SUMMARY

PM10-2.5 (μg/m3) - 24 HOUR AVERAGES

Reno 3
11-36

Location:

MONTH AVG. HIGH DATE 2ND 

HIGH DATE 3RD HIGH DATE 4TH HIGH DATE

JAN 21 39 12 34 21 32 24 31 28

FEB 17 46 1 30 14 29 2 25 3

MAR 8 22 1 22 9 18 31 14 10

APR 7 16 14 15 4 12 2 12 15

MAY 6 15 14 14 25 11 5 10 6

JUN 5 14 18 11 28 10 22 9 16

JUL 7 13 29 11 25 11 30 10 6

AUG 7 13 31 11 16 10 25 9 20

SEP 10 16 24 16 30 13 1 13 9

OCT 9 19 24 17 25 15 31 14 27

NOV 11 32 3 27 18 18 28 16 29

DEC 18 43 21 26 26 26 27 24 20

ANNUAL 

STATISTICS AVG. HIGH MONTH/ 

DAY

2ND 

HIGH

MONTH/ 

DAY

3RD 

HIGH

MONTH/ 

DAY

4TH 

HIGH

MONTH/ 

DAY

10.5 46 FEB 1 43 DEC 21 39 JAN 12 34 JAN 21

2011 ANNUAL SUMMARY

Continuous PM10-2.5 (μg/m3) - 24 HOUR AVERAGES

Reno 3 BAM
11-37

Location:

MONTH AVG. HIGH DATE/ 

HOUR*

2ND 

HIGH

DATE/ 

HOUR*

3RD 

HIGH

DATE/ 

HOUR*

4TH 

HIGH

DATE/ 

HOUR*

JAN 29.8 65.1 28/10 58.5 8/11 57.5 13/10 51.8 29/11

FEB 22.9 64.3 27/19 57.6 28/00 51.3 3/07 51.2 13/19

MAR 13.5 58.2 1/20 54.8 14/07 48.6 10/00 47.0 27/06

APR 9.7 52.3 15/06 51.3 14/06 42.3 11/06 40.4 4/21

MAY 9.6 46.9 4/05 43.4 5/07 43.3 12/06 42.6 25/06

JUN 8.4 40.8 28/06 34.8 16/21 25.5 10/07 25.5 24/03

JUL 9.3 38.6 19/06 36.3 18/06 35.1 30/23 33.4 25/08

AUG 10.3 45.2 31/06 30.1 25/00 27.9 13/01 27.6 4/06

SEP 15.6 48.7 26/19 45.4 29/21 44.5 15/07 43.4 2/22

OCT 17.4 55.4 24/08 49.2 13/10 48.6 23/21 46.0 27/19

NOV 22.1 59.5 22/10 53.9 28/12 48.8 10/09 48.5 3/07

DEC 32.0 71.1 28/10 58.3 27/09 58.0 21/08 58.0 26/17

ANNUAL 

STATISTICS AVG. HIGH MONTH 

DATE/HOUR*

2ND 

HIGH

MONTH 

DATE/HOUR*

3RD 

HIGH

MONTH 

DATE/HOUR*

4TH 

HIGH

MONTH 

DATE/HOUR*

16.7 71.1 DEC 28/10 65.1 JAN 28/10 64.3 FEB 27/19 59.5 NOV 

22/10

* Hour Beginning

2011 ANNUAL SUMMARY

NO2 (ppb) - HOURLY AVERAGES

Reno 3
11-38

Location:

MONTH AVG. HIGH DATE/ 

HOUR*

2ND 

HIGH

DATE/ 

HOUR*

3RD 

HIGH

DATE/ 

HOUR*

4TH 

HIGH

DATE/ 

HOUR*

JAN 32.7 301.5 28/08 264.0 25/07 199.4 13/07 187.0 8/08

FEB 15.5 194.5 7/08 165.3 5/08 159.8 3/07 120.7 4/06

MAR 4.4 70.4 29/06 67.8 17/06 66.6 14/07 54.9 9/07

APR 2.4 78.1 15/06 61.3 14/06 49.6 11/06 49.4 6/07

MAY 2.1 74.2 12/06 56.1 5/07 44.7 4/06 31.1 3/06

JUN 1.4 19.6 28/06 16.8 8/08 16.7 3/06 15.3 10/07

JUL 1.6 54.9 18/06 40.8 19/06 17.1 12/05 17.0 26/07

AUG 1.5 59.5 31/06 19.9 15/07 14.8 13/07 13.9 2/06

SEP 3.8 82.8 15/07 52.4 30/22 45.6 13/07 34.4 27/06

OCT 9.0 163.6 24/08 112.7 13/06 97.7 26/06 80.9 15/00

NOV 17.6 184.6 22/09 182.1 10/09 176.0 15/08 168.3 28/08

DEC 38.0 250.8 21/08 209.7 12/08 188.1 2/07 177.7 11/07

ANNUAL 

STATISTICS AVG. HIGH MONTH 

DATE/HOUR*

2ND 

HIGH

MONTH 

DATE/HOUR*

3RD 

HIGH

MONTH 

DATE/HOUR*

4TH 

HIGH

MONTH 

DATE/HOUR*

10.8 301.5 JAN 28/08 264.0 JAN 25/07 250.8 DEC 21/08 209.7 DEC 12/08

* Hour Beginning

2011 ANNUAL SUMMARY

NO (ppb) - HOURLY AVERAGES

Reno 3
11-39

Location:

MONTH AVG. HIGH DATE/ 

HOUR*

2ND 

HIGH

DATE/ 

HOUR*

3RD 

HIGH

DATE/ 

HOUR*

4TH 

HIGH

DATE/ 

HOUR*

JAN 63.1 360.4 28/08 314.0 25/07 248.8 13/08 236.1 8/08

FEB 38.9 239.4 7/08 212.6 5/08 211.5 3/07 163.1 4/06

MAR 18.4 121.9 14/07 114.3 17/06 113.0 29/07 104.0 1/20

APR 12.6 130.9 15/06 113.0 14/06 92.3 11/06 89.5 6/07

MAY 12.2 118.0 12/06 99.9 5/07 91.5 4/06 73.2 3/06

JUN 10.3 60.8 28/06 41.2 10/07 39.9 16/21 38.5 3/06

JUL 11.5 91.6 18/06 80.0 19/06 50.7 25/08 49.2 12/05

AUG 12.5 105.3 31/06 42.7 13/07 42.2 15/07 40.0 2/06

SEP 20.0 127.8 15/07 91.9 30/09 76.9 13/07 73.7 26/20

OCT 27.0 219.4 24/08 142.0 13/06 137.5 26/06 109.0 15/00

NOV 40.3 241.4 22/09 231.3 10/09 224.9 15/08 218.6 28/08

DEC 70.7 309.3 21/08 265.7 12/08 240.3 2/07 226.9 11/07

ANNUAL 

STATISTICS AVG. HIGH MONTH 

DATE/HOUR*

2ND 

HIGH

MONTH 

DATE/HOUR*

3RD 

HIGH

MONTH 

DATE/HOUR*

4TH 

HIGH

MONTH 

DATE/HOUR*

28.1 360.4 JAN 28/08 314.0 JAN 25/07 309.3 DEC 21/08 265.7 DEC 12/08

* Hour Beginning

2011 ANNUAL SUMMARY

NOx (ppb) - HOURLY AVERAGES

Reno 3
11-40

Location:

MONTH AVG. HIGH DATE/ 

HOUR*

2ND 

HIGH

DATE/ 

HOUR*

3RD 

HIGH

DATE/ 

HOUR*

4TH 

HIGH

DATE/ 

HOUR*

JAN 29.0 67.2 28/10 57.2 13/10 56.6 8/11 53.6 25/07

FEB 21.7 65.3 27/19 56.1 28/00 49.6 13/19 48.6 10/19

MAR 12.6 57.6 1/20 52.1 14/07 46.4 10/00 46.3 5/01

APR 8.8 52.4 15/06 49.0 14/06 39.9 11/06 38.5 4/20

MAY 8.9 45.7 4/05 41.4 12/06 41.4 25/06 41.3 5/07

JUN 7.9 40.0 28/06 33.7 16/21 26.4 24/03 24.0 10/07

JUL 8.8 36.6 19/06 35.2 30/23 33.9 18/06 32.0 25/08

AUG 10.1 44.5 31/06 31.5 25/00 29.1 30/00 27.6 13/01

SEP 15.4 50.0 26/19 46.3 29/21 44.4 15/07 42.2 2/22

OCT 17.4 55.8 13/10 55.4 24/08 49.8 23/21 46.7 12/20

NOV 21.3 59.5 22/10 52.6 28/12 47.1 10/09 46.5 15/08

DEC 31.1 71.9 28/10 60.2 26/17 58.7 21/08 57.9 12/09

ANNUAL 

STATISTICS AVG. HIGH MONTH 

DATE/HOUR*

2ND 

HIGH

MONTH 

DATE/HOUR*

3RD 

HIGH

MONTH 

DATE/HOUR*

4TH 

HIGH

MONTH 

DATE/HOUR*

16.1 71.9 DEC 28/10 67.2 JAN 28/10 65.3 FEB 27/19 60.2 DEC 26/17

* Hour Beginning

2011 ANNUAL SUMMARY

TRACE NOy-NO (ppb) - HOURLY AVERAGES

Reno 3
11-41

Location:

MONTH AVG. HIGH DATE/ 

HOUR*

2ND 

HIGH

DATE/ 

HOUR*

3RD 

HIGH

DATE/ 

HOUR*

4TH 

HIGH

DATE/ 

HOUR*

JAN 32.1 306.5 28/08 283.5 25/07 195.4 13/08 187.7 24/08

FEB 15.0 189.2 7/08 162.2 5/08 153.4 3/07 116.2 4/06

MAR 4.7 71.7 17/06 69.1 29/07 60.8 14/07 51.1 9/07

APR 2.8 72.0 15/06 60.6 14/06 48.4 6/07 47.1 11/06

MAY 2.5 73.0 12/06 56.2 5/07 43.9 4/06 30.4 3/06

JUN 1.9 20.0 28/06 18.2 3/06 15.7 20/06 15.5 10/07

JUL 1.9 53.2 18/06 40.1 19/06 18.1 12/05 17.0 25/08

AUG 1.6 59.7 31/06 19.6 15/07 15.0 13/07 13.3 2/06

SEP 3.6 82.2 15/07 53.1 30/09 44.8 13/07 33.4 24/08

OCT 9.1 165.3 24/08 129.9 13/06 105.9 26/05 77.5 15/00

NOV 17.1 187.4 22/09 178.7 10/09 172.6 15/08 162.4 28/08

DEC 37.7 248.9 21/08 216.1 12/09 191.8 2/07 180.0 11/07

ANNUAL 

STATISTICS AVG. HIGH MONTH 

DATE/HOUR*

2ND 

HIGH

MONTH 

DATE/HOUR*

3RD 

HIGH

MONTH 

DATE/HOUR*

4TH 

HIGH

MONTH 

DATE/HOUR*

10.8 306.5 JAN 28/08 283.5 JAN 25/07 248.9 DEC 21/08 216.1 DEC 12/09

* Hour Beginning

2011 ANNUAL SUMMARY

Trace NO (ppb) - HOURLY AVERAGES

Reno 3
11-42

Location:

MONTH AVG. HIGH DATE/ 

HOUR*

2ND 

HIGH

DATE/ 

HOUR*

3RD 

HIGH

DATE/ 

HOUR*

4TH 

HIGH

DATE/ 

HOUR*

JAN 61.1 367.4 28/08 337.0 25/07 245.2 13/08 234.6 24/08

FEB 36.6 229.4 7/08 205.3 5/08 198.1 3/07 159.9 8/07

MAR 17.3 116.2 17/06 112.9 14/07 110.9 29/07 99.6 1/20

APR 11.6 124.3 15/06 109.6 14/06 87.0 11/06 85.8 6/07

MAY 11.4 114.5 12/06 97.5 5/07 88.2 4/06 71.2 3/06

JUN 9.7 60.1 28/06 39.5 10/07 39.3 3/06 37.2 16/21

JUL 10.7 87.1 18/06 76.8 19/06 49.0 25/08 48.8 12/05

AUG 11.7 104.2 31/06 41.1 13/07 40.1 15/07 37.6 2/06

SEP 19.0 126.4 15/07 93.2 30/09 75.6 13/07 74.9 26/20

OCT 26.5 220.7 24/08 161.9 13/06 144.0 26/05 105.0 15/00

NOV 38.4 243.9 22/09 225.7 10/09 219.0 15/08 208.7 28/08

DEC 68.8 307.4 21/08 274.0 12/09 242.6 2/07 226.0 11/07

ANNUAL 

STATISTICS AVG. HIGH MONTH 

DATE/HOUR*

2ND 

HIGH

MONTH 

DATE/HOUR*

3RD 

HIGH

MONTH 

DATE/HOUR*

4TH 

HIGH

MONTH 

DATE/HOUR*

26.9 367.4 JAN 28/08 337.0 JAN 25/07 307.4 DEC 21/08 274.0 DEC 12/09

* Hour Beginning

2011 ANNUAL SUMMARY

TRACE NOy (ppb) - HOURLY AVERAGES

Reno 3
11-43

Location:

MONTH AVG. HIGH DATE/ 

HOUR*

2ND 

HIGH

DATE/ 

HOUR*

3RD 

HIGH

DATE/ 

HOUR*

4TH 

HIGH

DATE/ 

HOUR*

JAN 0.97 7.67 28/08 6.52 25/07 5.59 24/08 4.93 13/08

FEB 0.76 4.75 5/08 4.69 7/07 3.94 3/07 3.37 8/07

MAR 0.32 3.56 12/01 2.48 1/20 2.15 29/08 1.95 17/06

APR 0.45 2.49 15/07 2.00 14/06 1.70 11/06 1.65 6/07

MAY 0.30 2.03 12/06 1.42 5/07 1.10 4/06 1.07 3/06

JUN 0.32 2.01 29/01 1.03 28/06 0.85 3/07 0.82 27/23

JUL 0.46 2.81 19/09 1.94 18/06 0.97 12/05 0.79 7/08

AUG 0.43 1.85 31/06 1.17 4/22 1.01 8/08 0.80 15/07

SEP 0.44 2.13 15/07 1.59 30/22 1.30 13/07 1.22 16/08

OCT 0.47 2.71 13/06 2.64 26/06 2.45 24/09 2.43 15/00

NOV 0.64 5.61 22/10 4.74 28/09 4.40 10/09 4.36 15/08

DEC 1.19 6.37 21/08 5.69 12/08 5.45 2/07 5.14 11/08

ANNUAL 

STATISTICS AVG. HIGH MONTH 

DATE/HOUR*

2ND 

HIGH

MONTH 

DATE/HOUR*

3RD 

HIGH

MONTH 

DATE/HOUR*

4TH 

HIGH

MONTH 

DATE/HOUR*

0.6 7.67 JAN 28/08 6.52 JAN 25/07 6.37 DEC 21/08 5.69 DEC 12/08

* Hour Beginning

2011 ANNUAL SUMMARY

TRACE SO2 (ppb) - HOURLY AVERAGES

Reno 3
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