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: 2011

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: 2011

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 8570 0.101 0.099 0.096 0.095 0 0.00 214 209 98 0 None 1 110010041 420 34th Street

N.E.,Washington, Dc 20019

Washington District of

Columbia

DC 03

1 HOUR 8434 0.107 0.101 0.101 0.096 0 0.00 214 204 95 0 None 1 110010043 2500 1st Street, N.W.

Washington Dc

Washington District of

Columbia

DC 03

1 HOUR 5031 0.109 0.107 0.107 0.095 0 0.00 214 210 98 2 None 1 240090011 350 Stafford Road Prince

Frederick

Calvert MD 03

1 HOUR 4964 0.108 0.098 0.096 0.095 0 0.00 214 206 96 0 None 1 240170010 14320 Oaks Road Charlotte Hall Charles MD 03

1 HOUR 5117 0.09 0.089 0.084 0.083 0 0.00 214 214 100 0 None 1 240210037 Frederick County Airport

,180 E Airport Drive

Frederick Frederick MD 03

1 HOUR 5084 0.097 0.097 0.096 0.092 0 0.00 214 211 99 2 None 1 240313001 Lathrop E. Smith

Environmental Education

Center, 5110 Meadowside

Lane

Rockville Montgomery MD 03

1 HOUR 7989 0.114 0.109 0.093 0.093 0 0.00 214 190 89 3 None 1 240330030 Howard University'S

Beltsville Laboratory, 12003

Old Baltimore Pike

Beltsville Prince

George's

MD 03

1 HOUR 5107 0.11 0.11 0.106 0.105 0 0.00 214 213 100 1 None 1 240338003 Pg County Equestrian

Center, 14900 Pennsylvania

Ave.

Greater

Upper

Marlboro

Prince

George's

MD 03

1 HOUR 5840 0.113 0.102 0.097 0.095 0 0.00 214 185 86 3 None 1 240339991 Powder Mill Rd, Laurel, Md

20708

Not in a city Prince

George's

MD 03

1 HOUR 5104 0.109 0.103 0.102 0.098 0 0.00 214 212 99 2 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: 2011

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 5115 0.11 0.106 0.1 0.096 0 0.00 214 212 99 2 None 1 510590030 Sta. 46-B9, Lee Park,

Telegraph Road

Groveton Fairfax VA 03

1 HOUR 5095 0.077 0.076 0.074 0.069 0 0.00 214 213 100 1 None 1 510610002 Rt651 C Phelps Wildlife

Management Area

Not in a city Fauquier VA 03

1 HOUR 5104 0.098 0.086 0.085 0.084 0 0.00 214 212 99 2 None 1 511071005 38-I, Broad Run High

School, Ashburn

Not in a city Loudoun VA 03

1 HOUR 5007 0.083 0.08 0.078 0.077 0 0.00 214 209 98 0 None 1 511530009 James S. Long Park Not in a city Prince

William

VA 03

1 HOUR 5107 0.097 0.097 0.085 0.084 0 0.00 214 214 100 0 None 1 511790001 Widewater Elem. Sch., Den

Rich Road

Aquia

Harbour

Stafford VA 03

1 HOUR 5054 0.109 0.103 0.102 0.096 0 0.00 214 212 99 2 None 1 515100009 517 N Saint Asaph St,

Alexandria Health

Alexandria 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: 2011

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: 2011

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

8620 0.085 0.084 0.082 0.08 6 6.20 214 207 97 0 None 1 110010041 420 34th Street

N.E.,Washington, Dc

20019

Washington District of

Columbia

DC 03

8-HR RUN

AVG BEGIN

HOUR

8466 0.092 0.087 0.086 0.085 11 11.60 214 203 95 0 None 1 110010043 2500 1st Street, N.W.

Washington Dc

Washington District of

Columbia

DC 03

8-HR RUN

AVG BEGIN

HOUR

5023 0.093 0.092 0.087 0.082 6 6.20 214 206 96 0 None 1 240090011 350 Stafford Road Prince

Frederick

Calvert MD 03

8-HR RUN

AVG BEGIN

HOUR

4957 0.098 0.087 0.086 0.085 7 7.30 214 205 96 0 None 1 240170010 14320 Oaks Road Charlotte

Hall

Charles MD 03

8-HR RUN

AVG BEGIN

HOUR

5121 0.085 0.082 0.078 0.077 6 6.00 214 214 100 0 None 1 240210037 Frederick County Airport

,180 E Airport Drive

Frederick Frederick MD 03

8-HR RUN

AVG BEGIN

HOUR

5079 0.088 0.085 0.082 0.081 5 5.10 214 210 98 0 None 1 240313001 Lathrop E. Smith

Environmental Education

Center, 5110 Meadowside

Lane

Rockville Montgomery MD 03

8-HR RUN

AVG BEGIN

HOUR

7946 0.094 0.091 0.088 0.083 7 8.20 214 182 85 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: 2011

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

5087 0.095 0.092 0.09 0.086 14 14.10 214 213 100 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

5845 0.092 0.086 0.085 0.084 7 8.30 214 181 85 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

5101 0.1 0.093 0.089 0.087 8 8.10 214 212 99 0 None 1 510130020 S 18th And Hayes St Arlington Arlington VA 03

8-HR RUN

AVG BEGIN

HOUR

5119 0.099 0.096 0.09 0.087 11 11.10 214 212 99 0 None 1 510590030 Sta. 46-B9, Lee Park,

Telegraph Road

Groveton Fairfax VA 03

8-HR RUN

AVG BEGIN

HOUR

5118 0.067 0.065 0.065 0.063 0 0.00 214 212 99 0 None 1 510610002 Rt651 C Phelps Wildlife

Management Area

Not in a city Fauquier VA 03

8-HR RUN

AVG BEGIN

HOUR

5113 0.086 0.081 0.08 0.075 3 3.00 214 212 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

5017 0.079 0.073 0.071 0.071 1 1.00 214 208 97 0 None 1 511530009 James S. Long Park Not in a city Prince

William

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: 2011

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

5127 0.086 0.08 0.075 0.074 2 2.00 214 214 100 0 None 1 511790001 Widewater Elem. Sch.,

Den Rich Road

Aquia

Harbour

Stafford VA 03

8-HR RUN

AVG BEGIN

HOUR

5065 0.1 0.095 0.09 0.084 7 7.10 214 212 99 0 None 1 515100009 517 N Saint Asaph St,

Alexandria Health

Alexandria Alexandria

City

VA 03