### Page 1 of 2 Generated: May 1, 2012 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:Baltimore-Towson, MD Pollutant:Ozone Year:2008 Exceptional Events:Included (if any)

Page 1 of 2 Generated: May 1, 2012 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:Baltimore-Towson, MD Pollutant:Ozone Year:2008 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 5033 0.098 0.095 0.093 0.092 0 0.00 214 208 97 4 None 1 240030014Davidsonville Recreation Center, 3801 Queen Anne Bridge Road Not in a city Anne Arundel MD 03

1 HOUR 51090.129 0.111 0.103 0.103 1 1.00 214 214 100 0 None 1 240051007Padonia Elementary School, 9834 Greenside Drive CockeysvilleBaltimore MD 03

1 HOUR 86500.117 0.099 0.096 0.095 0 0.00 214 208 97 5 Included 1 240053001 600 Dorsey Avenue Essex Baltimore MD 03

1 HOUR 50960.108 0.103 0.096 0.089 0 0.00 214 211 99 3 None 1 240130001 1300 W. Old Liberty Road Not in a city Carroll MD 03

1 HOUR 48500.115 0.115 0.115 0.105 0 0.00 214 202 94 1 Included 1 240251001 Edgewood Chemical Biological Center (Apg), Waehli Road Edgewood Harford MD 03

1 HOUR 50800.118 0.11 0.103 0.102 0 0.00 214 212 99 0 Included 1 240259001 3560 Aldino Road Not in a city Harford MD 03

1 HOUR 51080.098 0.071 0.068 0.067 0 0.00 214 214 100 0 None 1 245100054Furley E.S. Recreational Center, 4633 Furley Avenue. Baltimore Baltimore (City) MD 03

### Page 2 of 2 Generated: May 1, 2012 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:Baltimore-Towson, MD Pollutant:Ozone Year:2008 Exceptional Events:Included (if any)

Page 2 of 2 Generated: May 1, 2012 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:Baltimore-Towson, MD Pollutant:Ozone Year:2008 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 50180.087 0.087 0.086 0.081 13 13.50 214 206 96 0 None 1 240030014Davidsonville Recreation Center, 3801 Queen Anne Bridge Road Not in a city Anne Arundel MD 03

8-HR RUN AVG BEGIN HOUR 5117 0.099 0.097 0.088 0.087 6 6.00 214 214 100 0 None 1 240051007Padonia Elementary School, 9834 Greenside Drive CockeysvilleBaltimore MD 03

8-HR RUN AVG BEGIN HOUR 8643 0.099 0.084 0.081 0.081 11 11.40 214 207 97 0 Included 1 240053001 600 Dorsey Avenue Essex Baltimore MD 03

8-HR RUN AVG BEGIN HOUR 5092 0.096 0.083 0.079 0.078 6 6.10 214 210 98 0 None 1 240130001 1300 W. Old Liberty Road Not in a city Carroll MD 03

8-HR RUN AVG BEGIN HOUR 48480.102 0.1 0.093 0.089 15 15.90 214 202 94 0 Included 1 240251001 Edgewood Chemical Biological Center (Apg), Waehli Road Edgewood Harford MD 03

8-HR RUN AVG BEGIN HOUR 5097 0.099 0.092 0.089 0.087 13 13.10 214 212 99 0 Included 1 240259001 3560 Aldino Road Not in a city Harford MD 03

8-HR RUN AVG BEGIN HOUR 51090.082 0.065 0.062 0.062 1 1.00 214 212 99 0 None 1 245100054Furley E.S. Recreational Center, 4633 Furley Avenue. Baltimore Baltimore (City) MD 03