Page 1 of 5

Generated: August 22, 2014

Source: U.S. EPA AirData <http://www.epa.gov/airdata>

This report is based on monitor-level summary statistics. Air quality standards for some pollutants (PM2.5 and Pb) allow for combining data from multiple monitors into a site-level

summary statistic that can be compared to the standard. In those cases, the site-level statistics may differ from the monitor-level statistics upon which this report is based.

Readers are cautioned not to rank order geographic areas based on AirData reports. Air pollution levels measured at a particular monitoring site are not necessarily representative

of the air quality for an entire county or urban area.

AirData reports are produced from a direct query of the AQS Data Mart. The data represent the best and most recent information available to EPA from state agencies. However,

some values may be absent due to incomplete reporting, and some values may change due to quality assurance activities. The AQS database is updated daily by state, local, and

tribal organizations who own and submit the data. Please contact the appropriate air quality monitoring agency to report any data problems.

<http://www.epa.gov/airquality/airdata/ad_contacts.html>

Get detailed information about this report, including column descriptions, at http://www.epa.gov/airquality/airdata/ad_about_reports.html#mon

Monitor Values Report

Geographic Area: Washington-Arlington-Alexandria, DC-VA-MD-WV

Pollutant: Ozone

Year: 2012

Exceptional Events: Included (if any)

Page 1 of 5

Generated: August 22, 2014

Source: U.S. EPA AirData <http://www.epa.gov/airdata>

This report is based on monitor-level summary statistics. Air quality standards for some pollutants (PM2.5 and Pb) allow for combining data from multiple monitors into a site-level

summary statistic that can be compared to the standard. In those cases, the site-level statistics may differ from the monitor-level statistics upon which this report is based.

Readers are cautioned not to rank order geographic areas based on AirData reports. Air pollution levels measured at a particular monitoring site are not necessarily representative

of the air quality for an entire county or urban area.

AirData reports are produced from a direct query of the AQS Data Mart. The data represent the best and most recent information available to EPA from state agencies. However,

some values may be absent due to incomplete reporting, and some values may change due to quality assurance activities. The AQS database is updated daily by state, local, and

tribal organizations who own and submit the data. Please contact the appropriate air quality monitoring agency to report any data problems.

<http://www.epa.gov/airquality/airdata/ad_contacts.html>

Get detailed information about this report, including column descriptions, at http://www.epa.gov/airquality/airdata/ad_about_reports.html#mon

Monitor Values Report

Geographic Area: Washington-Arlington-Alexandria, DC-VA-MD-WV

Pollutant: Ozone

Year: 2012

Exceptional Events: Included (if any)

Duration Description=1 HOUR

Duration

Description Obs

First

Max

Second

Max

Third

Max

Fourth

Max

Actual

Exc

Est

Exc

Required

Days

Valid

Days

Percent

Days

Missing

Days

Exc

Events

Monitor

Number Site ID Address City County State

EPA

Region

1 HOUR 8620 0.102 0.097 0.09 0.089 0 0.00 214 211 99 1 None 1 110010041 420 34th Street

N.E.,Washington, Dc 20019

Washington District of

Columbia

DC 03

1 HOUR 8681 0.109 0.098 0.098 0.097 0 0.00 214 214 100 0 None 1 110010043 2500 1st Street, N.W.

Washington Dc

Washington District of

Columbia

DC 03

1 HOUR 5024 0.125 0.105 0.094 0.092 1 1.00 214 210 98 1 None 1 240090011 350 Stafford Road Prince

Frederick

Calvert MD 03

1 HOUR 4772 0.117 0.103 0.1 0.093 0 0.00 214 194 91 0 None 1 240170010 14320 Oaks Road Charlotte Hall Charles MD 03

1 HOUR 4747 0.097 0.09 0.087 0.085 0 0.00 214 199 93 0 None 1 240210037 Frederick County Airport

,180 E Airport Drive

Frederick Frederick MD 03

1 HOUR 5012 0.1 0.088 0.086 0.084 0 0.00 214 211 99 0 None 1 240313001 Lathrop E. Smith

Environmental Education

Center, 5110 Meadowside

Lane

Rockville Montgomery MD 03

1 HOUR 8492 0.1 0.099 0.094 0.093 0 0.00 214 213 100 1 None 1 240330030 Howard University'S

Beltsville Laboratory, 12003

Old Baltimore Pike

Beltsville Prince

George's

MD 03

1 HOUR 5004 0.111 0.107 0.102 0.1 0 0.00 214 208 97 1 None 1 240338003 Pg County Equestrian

Center, 14900 Pennsylvania

Ave.

Greater

Upper

Marlboro

Prince

George's

MD 03

1 HOUR 8033 0.107 0.103 0.097 0.097 0 0.00 214 189 88 5 None 1 240339991 Powder Mill Rd, Laurel, Md

20708

Not in a city Prince

George's

MD 03

1 HOUR 5117 0.102 0.101 0.1 0.098 0 0.00 214 213 100 0 None 1 510130020 S 18th And Hayes St Arlington Arlington VA 03
Page 2 of 5

Generated: August 22, 2014

Source: U.S. EPA AirData <http://www.epa.gov/airdata>

This report is based on monitor-level summary statistics. Air quality standards for some pollutants (PM2.5 and Pb) allow for combining data from multiple monitors into a site-level

summary statistic that can be compared to the standard. In those cases, the site-level statistics may differ from the monitor-level statistics upon which this report is based.

Readers are cautioned not to rank order geographic areas based on AirData reports. Air pollution levels measured at a particular monitoring site are not necessarily representative

of the air quality for an entire county or urban area.

AirData reports are produced from a direct query of the AQS Data Mart. The data represent the best and most recent information available to EPA from state agencies. However,

some values may be absent due to incomplete reporting, and some values may change due to quality assurance activities. The AQS database is updated daily by state, local, and

tribal organizations who own and submit the data. Please contact the appropriate air quality monitoring agency to report any data problems.

<http://www.epa.gov/airquality/airdata/ad_contacts.html>

Get detailed information about this report, including column descriptions, at http://www.epa.gov/airquality/airdata/ad_about_reports.html#mon

Monitor Values Report

Geographic Area: Washington-Arlington-Alexandria, DC-VA-MD-WV

Pollutant: Ozone

Year: 2012

Exceptional Events: Included (if any)

Duration Description=1 HOUR

Duration

Description Obs

First

Max

Second

Max

Third

Max

Fourth

Max

Actual

Exc

Est

Exc

Required

Days

Valid

Days

Percent

Days

Missing

Days

Exc

Events

Monitor

Number Site ID Address City County State

EPA

Region

1 HOUR 5061 0.125 0.106 0.099 0.099 1 1.00 214 210 98 1 None 1 510590030 Sta. 46-B9, Lee Park,

Telegraph Road

Groveton Fairfax VA 03

1 HOUR 4825 0.076 0.074 0.073 0.071 0 0.00 214 201 94 1 None 1 510610002 Rt651 C Phelps Wildlife

Management Area

Not in a city Fauquier VA 03

1 HOUR 5094 0.092 0.086 0.083 0.081 0 0.00 214 214 100 0 None 1 511071005 38-I, Broad Run High

School, Ashburn

Not in a city Loudoun VA 03

1 HOUR 5089 0.093 0.089 0.087 0.081 0 0.00 214 212 99 0 None 1 511530009 James S. Long Park Not in a city Prince

William

VA 03

1 HOUR 5084 0.09 0.089 0.088 0.083 0 0.00 214 214 100 0 None 1 511790001 Widewater Elem. Sch., Den

Rich Road

Aquia

Harbour

Stafford VA 03

1 HOUR 3354 0.128 0.107 0.099 0.096 1 1.50 214 140 65 2 None 1 515100009 517 N Saint Asaph St,

Alexandria Health

Alexandria Alexandria

City

VA 03

1 HOUR 1537 0.082 0.079 0.078 0.074 0 0.00 214 64 30 1 None 1 515100021 3200 Colvin Street Not in a city Alexandria

City

VA 03
Page 3 of 5

Generated: August 22, 2014

Source: U.S. EPA AirData <http://www.epa.gov/airdata>

This report is based on monitor-level summary statistics. Air quality standards for some pollutants (PM2.5 and Pb) allow for combining data from multiple monitors into a site-level

summary statistic that can be compared to the standard. In those cases, the site-level statistics may differ from the monitor-level statistics upon which this report is based.

Readers are cautioned not to rank order geographic areas based on AirData reports. Air pollution levels measured at a particular monitoring site are not necessarily representative

of the air quality for an entire county or urban area.

AirData reports are produced from a direct query of the AQS Data Mart. The data represent the best and most recent information available to EPA from state agencies. However,

some values may be absent due to incomplete reporting, and some values may change due to quality assurance activities. The AQS database is updated daily by state, local, and

tribal organizations who own and submit the data. Please contact the appropriate air quality monitoring agency to report any data problems.

<http://www.epa.gov/airquality/airdata/ad_contacts.html>

Get detailed information about this report, including column descriptions, at http://www.epa.gov/airquality/airdata/ad_about_reports.html#mon

Monitor Values Report

Geographic Area: Washington-Arlington-Alexandria, DC-VA-MD-WV

Pollutant: Ozone

Year: 2012

Exceptional Events: Included (if any)

Page 3 of 5

Generated: August 22, 2014

Source: U.S. EPA AirData <http://www.epa.gov/airdata>

This report is based on monitor-level summary statistics. Air quality standards for some pollutants (PM2.5 and Pb) allow for combining data from multiple monitors into a site-level

summary statistic that can be compared to the standard. In those cases, the site-level statistics may differ from the monitor-level statistics upon which this report is based.

Readers are cautioned not to rank order geographic areas based on AirData reports. Air pollution levels measured at a particular monitoring site are not necessarily representative

of the air quality for an entire county or urban area.

AirData reports are produced from a direct query of the AQS Data Mart. The data represent the best and most recent information available to EPA from state agencies. However,

some values may be absent due to incomplete reporting, and some values may change due to quality assurance activities. The AQS database is updated daily by state, local, and

tribal organizations who own and submit the data. Please contact the appropriate air quality monitoring agency to report any data problems.

<http://www.epa.gov/airquality/airdata/ad_contacts.html>

Get detailed information about this report, including column descriptions, at http://www.epa.gov/airquality/airdata/ad_about_reports.html#mon

Monitor Values Report

Geographic Area: Washington-Arlington-Alexandria, DC-VA-MD-WV

Pollutant: Ozone

Year: 2012

Exceptional Events: Included (if any)

Duration Description=8-HR RUN AVG BEGIN HOUR

Duration

Description Obs

First

Max

Second

Max

Third

Max

Fourth

Max

Actual

Exc

Est

Exc

Required

Days

Valid

Days

Percent

Days

Missing

Days

Exc

Events

Monitor

Number Site ID Address City County State

EPA

Region

8-HR RUN

AVG BEGIN

HOUR

8657 0.083 0.083 0.082 0.076 4 4.10 214 209 98 0 None 1 110010041 420 34th Street

N.E.,Washington, Dc

20019

Washington District of

Columbia

DC 03

8-HR RUN

AVG BEGIN

HOUR

8735 0.098 0.088 0.087 0.087 11 11.00 214 214 100 0 None 1 110010043 2500 1st Street, N.W.

Washington Dc

Washington District of

Columbia

DC 03

8-HR RUN

AVG BEGIN

HOUR

5030 0.111 0.091 0.082 0.082 11 11.20 214 210 98 0 None 1 240090011 350 Stafford Road Prince

Frederick

Calvert MD 03

8-HR RUN

AVG BEGIN

HOUR

4760 0.102 0.09 0.087 0.084 9 10.00 214 192 90 0 None 1 240170010 14320 Oaks Road Charlotte

Hall

Charles MD 03

8-HR RUN

AVG BEGIN

HOUR

4744 0.095 0.085 0.081 0.078 5 5.50 214 196 92 0 None 1 240210037 Frederick County Airport

,180 E Airport Drive

Frederick Frederick MD 03

8-HR RUN

AVG BEGIN

HOUR

5031 0.087 0.077 0.074 0.073 2 2.00 214 210 98 0 None 1 240313001 Lathrop E. Smith

Environmental Education

Center, 5110 Meadowside

Lane

Rockville Montgomery MD 03

8-HR RUN

AVG BEGIN

HOUR

8514 0.091 0.085 0.08 0.079 9 9.00 214 213 100 0 None 1 240330030 Howard University'S

Beltsville Laboratory,

12003 Old Baltimore Pike

Beltsville Prince

George's

MD 03
Page 4 of 5

Generated: August 22, 2014

Source: U.S. EPA AirData <http://www.epa.gov/airdata>

This report is based on monitor-level summary statistics. Air quality standards for some pollutants (PM2.5 and Pb) allow for combining data from multiple monitors into a site-level

summary statistic that can be compared to the standard. In those cases, the site-level statistics may differ from the monitor-level statistics upon which this report is based.

Readers are cautioned not to rank order geographic areas based on AirData reports. Air pollution levels measured at a particular monitoring site are not necessarily representative

of the air quality for an entire county or urban area.

AirData reports are produced from a direct query of the AQS Data Mart. The data represent the best and most recent information available to EPA from state agencies. However,

some values may be absent due to incomplete reporting, and some values may change due to quality assurance activities. The AQS database is updated daily by state, local, and

tribal organizations who own and submit the data. Please contact the appropriate air quality monitoring agency to report any data problems.

<http://www.epa.gov/airquality/airdata/ad_contacts.html>

Get detailed information about this report, including column descriptions, at http://www.epa.gov/airquality/airdata/ad_about_reports.html#mon

Monitor Values Report

Geographic Area: Washington-Arlington-Alexandria, DC-VA-MD-WV

Pollutant: Ozone

Year: 2012

Exceptional Events: Included (if any)

Duration Description=8-HR RUN AVG BEGIN HOUR

Duration

Description Obs

First

Max

Second

Max

Third

Max

Fourth

Max

Actual

Exc

Est

Exc

Required

Days

Valid

Days

Percent

Days

Missing

Days

Exc

Events

Monitor

Number Site ID Address City County State

EPA

Region

8-HR RUN

AVG BEGIN

HOUR

5013 0.104 0.091 0.09 0.09 14 14.50 214 207 97 0 None 1 240338003 Pg County Equestrian

Center, 14900

Pennsylvania Ave.

Greater

Upper

Marlboro

Prince

George's

MD 03

8-HR RUN

AVG BEGIN

HOUR

8143 0.097 0.085 0.085 0.084 15 17.10 214 188 88 0 None 1 240339991 Powder Mill Rd, Laurel,

Md 20708

Not in a city Prince

George's

MD 03

8-HR RUN

AVG BEGIN

HOUR

5107 0.094 0.093 0.088 0.084 12 12.10 214 212 99 0 None 1 510130020 S 18th And Hayes St Arlington Arlington VA 03

8-HR RUN

AVG BEGIN

HOUR

5051 0.106 0.097 0.096 0.084 12 12.30 214 209 98 0 None 1 510590030 Sta. 46-B9, Lee Park,

Telegraph Road

Groveton Fairfax VA 03

8-HR RUN

AVG BEGIN

HOUR

4842 0.068 0.063 0.062 0.061 0 0.00 214 199 93 0 None 1 510610002 Rt651 C Phelps Wildlife

Management Area

Not in a city Fauquier VA 03

8-HR RUN

AVG BEGIN

HOUR

5097 0.079 0.077 0.073 0.073 2 2.00 214 212 99 0 None 1 511071005 38-I, Broad Run High

School, Ashburn

Not in a city Loudoun VA 03

8-HR RUN

AVG BEGIN

HOUR

5092 0.082 0.078 0.075 0.072 2 2.00 214 212 99 0 None 1 511530009 James S. Long Park Not in a city Prince

William

VA 03

8-HR RUN

AVG BEGIN

HOUR

5091 0.082 0.081 0.079 0.076 4 4.00 214 212 99 0 None 1 511790001 Widewater Elem. Sch.,

Den Rich Road

Aquia

Harbour

Stafford VA 03
Page 5 of 5

Generated: August 22, 2014

Source: U.S. EPA AirData <http://www.epa.gov/airdata>

This report is based on monitor-level summary statistics. Air quality standards for some pollutants (PM2.5 and Pb) allow for combining data from multiple monitors into a site-level

summary statistic that can be compared to the standard. In those cases, the site-level statistics may differ from the monitor-level statistics upon which this report is based.

Readers are cautioned not to rank order geographic areas based on AirData reports. Air pollution levels measured at a particular monitoring site are not necessarily representative

of the air quality for an entire county or urban area.

AirData reports are produced from a direct query of the AQS Data Mart. The data represent the best and most recent information available to EPA from state agencies. However,

some values may be absent due to incomplete reporting, and some values may change due to quality assurance activities. The AQS database is updated daily by state, local, and

tribal organizations who own and submit the data. Please contact the appropriate air quality monitoring agency to report any data problems.

<http://www.epa.gov/airquality/airdata/ad_contacts.html>

Get detailed information about this report, including column descriptions, at http://www.epa.gov/airquality/airdata/ad_about_reports.html#mon

Monitor Values Report

Geographic Area: Washington-Arlington-Alexandria, DC-VA-MD-WV

Pollutant: Ozone

Year: 2012

Exceptional Events: Included (if any)

Duration Description=8-HR RUN AVG BEGIN HOUR

Duration

Description Obs

First

Max

Second

Max

Third

Max

Fourth

Max

Actual

Exc

Est

Exc

Required

Days

Valid

Days

Percent

Days

Missing

Days

Exc

Events

Monitor

Number Site ID Address City County State

EPA

Region

8-HR RUN

AVG BEGIN

HOUR

3343 0.098 0.096 0.089 0.086 7 10.90 214 138 64 0 None 1 515100009 517 N Saint Asaph St,

Alexandria Health

Alexandria Alexandria

City

VA 03

8-HR RUN

AVG BEGIN

HOUR

1529 0.071 0.067 0.067 0.056 0 0.00 214 62 29 0 None 1 515100021 3200 Colvin Street Not in a city Alexandria

City

VA 03