Date AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY 

## 2006 2006 2006 2006

5/28/2006 51-059-0030 0.076ppm 101 24 100 44201 Ozone Virginia Fairfax 5/29/2006 11-001-0025 0.08ppm 111 24 100 44201 Ozone District Of Columbia District of Columbia 5/29/2006 11-001-0041 0.086ppm 127 24 100 44201 Ozone District Of Columbia District of Columbia 5/29/2006 11-001-0043 0.088ppm 132 24 100 44201 Ozone District Of Columbia District of Columbia 5/29/200624-005-3001 0.076ppm 101 24 100 44201 Ozone Maryland Baltimore 5/29/200624-025-1001 0.077ppm 104 24 100 44201 Ozone Maryland Harford 5/29/200624-025-9001 0.082ppm 116 24 100 44201 Ozone Maryland Harford 5/29/200624-033-0030 0.085 ppm 124 24 100 44201 Ozone Maryland Prince George's 5/29/2006 51-013-0020 0.08ppm 111 24 100 44201 Ozone Virginia Arlington 5/30/2006 11-001-0025 0.086ppm 127 24 100 44201 Ozone District Of Columbia District of Columbia 5/30/2006 11-001-0041 0.093 ppm 145 24 100 44201 Ozone District Of Columbia District of Columbia 5/30/2006 11-001-0043 0.102ppm 166 24 100 44201 Ozone District Of Columbia District of Columbia 5/30/200624-003-0014 0.092ppm 142 24 100 44201 Ozone Maryland Anne Arundel 5/30/200624-005-1007 0.08ppm 111 24 100 44201 Ozone Maryland Baltimore 5/30/200624-005-3001 0.105 ppm 174 24 100 44201 Ozone Maryland Baltimore 5/30/200624-009-0011 0.077ppm 104 24 100 44201 Ozone Maryland Calvert 5/30/200624-013-0001 0.077ppm 104 24 100 44201 Ozone Maryland Carroll 5/30/200624-017-0010 0.079ppm 109 24 100 44201 Ozone Maryland Charles 5/30/200624-021-0037 0.078ppm 106 24 100 44201 Ozone Maryland Frederick 5/30/200624-025-1001 0.103 ppm 169 24 100 44201 Ozone Maryland Harford 5/30/200624-025-9001 0.094ppm 147 24 100 44201 Ozone Maryland Harford 5/30/200624-031-3001 0.083 ppm 119 24 100 44201 Ozone Maryland Montgomery 5/30/200624-033-0030 0.095 ppm 150 24 100 44201 Ozone Maryland Prince George's 5/30/200624-033-8003 0.085 ppm 124 24 100 44201 Ozone Maryland Prince George's 5/30/2006 51-013-0020 0.101 ppm 164 24 100 44201 Ozone Virginia Arlington 5/30/2006 51-059-0030 0.099ppm 159 24 100 44201 Ozone Virginia Fairfax 5/30/2006 51-061-0002 0.093 ppm 145 24 100 44201 Ozone Virginia Fauquier

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010Date AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

5/30/2006 51-107-1005 0.084ppm 122 24 100 44201 Ozone Virginia Loudoun 5/30/2006 51-153-0009 0.096ppm 151 24 100 44201 Ozone Virginia Prince William 5/30/2006 51-179-0001 0.116ppm 201 24 100 44201 Ozone Virginia Stafford 5/30/2006 51-510-0009 0.094ppm 147 24 100 44201 Ozone Virginia Alexandria City 5/31/2006 11-001-0025 0.085 ppm 124 24 100 44201 Ozone District Of Columbia District of Columbia 5/31/2006 11-001-0041 0.076ppm 101 24 100 44201 Ozone District Of Columbia District of Columbia 5/31/2006 11-001-0043 0.087ppm 129 24 100 44201 Ozone District Of Columbia District of Columbia 5/31/200624-013-0001 0.104ppm 172 24 100 44201 Ozone Maryland Carroll 5/31/200624-021-0037 0.088ppm 132 24 100 44201 Ozone Maryland Frederick 5/31/200624-031-3001 0.101 ppm 164 24 100 44201 Ozone Maryland Montgomery 5/31/200624-033-0030 0.077ppm 104 24 100 44201 Ozone Maryland Prince George's 5/31/2006 51-013-0020 0.085 ppm 124 24 100 44201 Ozone Virginia Arlington 5/31/2006 51-059-0030 0.078ppm 106 24 100 44201 Ozone Virginia Fairfax 5/31/2006 51-061-0002 0.078ppm 106 24 100 44201 Ozone Virginia Fauquier 5/31/2006 51-107-1005 0.102ppm 166 24 100 44201 Ozone Virginia Loudoun 5/31/2006 51-153-0009 0.098ppm 156 24 100 44201 Ozone Virginia Prince William 5/31/2006 51-510-0009 0.08ppm 111 24 100 44201 Ozone Virginia Alexandria City 6/1/2006 11-001-0025 0.085 ppm 124 24 100 44201 Ozone District Of Columbia District of Columbia 6/1/2006 11-001-0041 0.079ppm 109 24 100 44201 Ozone District Of Columbia District of Columbia 6/1/2006 11-001-0043 0.085 ppm 124 24 100 44201 Ozone District Of Columbia District of Columbia 6/1/200624-005-1007 0.078ppm 106 24 100 44201 Ozone Maryland Baltimore 6/1/200624-021-0037 0.079ppm 109 24 100 44201 Ozone Maryland Frederick 6/1/200624-025-1001 0.079ppm 109 24 100 44201 Ozone Maryland Harford 6/1/200624-025-9001 0.083 ppm 119 24 100 44201 Ozone Maryland Harford 6/1/200624-031-3001 0.09ppm 137 24 100 44201 Ozone Maryland Montgomery 6/1/200624-033-0030 0.098ppm 156 24 100 44201 Ozone Maryland Prince George's 6/1/200624-033-8003 0.077ppm 104 24 100 44201 Ozone Maryland Prince George's 6/1/2006 51-013-0020 0.083 ppm 119 24 100 44201 Ozone Virginia ArlingtonDate AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

6/1/2006 51-059-0030 0.079ppm 109 24 100 44201 Ozone Virginia Fairfax

6/16/2006 51-059-0030 0.079ppm 109 24 100 44201 Ozone Virginia Fairfax 6/17/2006 11-001-0025 0.076ppm 101 24 100 44201 Ozone District Of Columbia District of Columbia 6/17/2006 11-001-0043 0.081 ppm 114 24 100 44201 Ozone District Of Columbia District of Columbia 6/17/200624-003-0014 0.076ppm 101 24 100 44201 Ozone Maryland Anne Arundel 6/17/200624-005-1007 0.085 ppm 124 24 100 44201 Ozone Maryland Baltimore 6/17/200624-013-0001 0.083 ppm 119 24 100 44201 Ozone Maryland Carroll 6/17/200624-021-0037 0.076ppm 101 24 100 44201 Ozone Maryland Frederick 6/17/200624-025-9001 0.077ppm 104 24 100 44201 Ozone Maryland Harford 6/17/200624-031-3001 0.091 ppm 140 24 100 44201 Ozone Maryland Montgomery 6/17/200624-033-0030 0.084ppm 122 24 100 44201 Ozone Maryland Prince George's 6/17/200624-033-8003 0.079ppm 109 24 100 44201 Ozone Maryland Prince George's 6/17/2006 51-013-0020 0.077ppm 104 24 100 44201 Ozone Virginia Arlington 6/17/2006 51-059-0030 0.076ppm 101 24 100 44201 Ozone Virginia Fairfax 6/17/2006 51-107-1005 0.077ppm 104 24 100 44201 Ozone Virginia Loudoun 6/17/2006 51-153-0009 0.077ppm 104 24 100 44201 Ozone Virginia Prince William 6/18/2006 11-001-0025 0.079ppm 109 24 100 44201 Ozone District Of Columbia District of Columbia 6/18/2006 11-001-0043 0.08ppm 111 24 100 44201 Ozone District Of Columbia District of Columbia 6/18/200624-005-1007 0.095 ppm 150 24 100 44201 Ozone Maryland Baltimore 6/18/200624-005-3001 0.082ppm 116 24 100 44201 Ozone Maryland Baltimore 6/18/200624-013-0001 0.082ppm 116 24 100 44201 Ozone Maryland Carroll 6/18/200624-021-0037 0.085 ppm 124 24 100 44201 Ozone Maryland Frederick 6/18/200624-025-1001 0.089ppm 135 24 100 44201 Ozone Maryland Harford 6/18/200624-025-9001 0.091 ppm 140 24 100 44201 Ozone Maryland Harford 6/18/200624-031-3001 0.083 ppm 119 24 100 44201 Ozone Maryland Montgomery 6/18/200624-033-0030 0.09ppm 137 24 100 44201 Ozone Maryland Prince George's 6/18/2006 51-013-0020 0.077ppm 104 24 100 44201 Ozone Virginia ArlingtonDate AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

6/18/2006 51-107-1005 0.076ppm 101 24 100 44201 Ozone Virginia Loudoun

6/21/2006 11-001-0041 0.082ppm 116 24 100 44201 Ozone District Of Columbia District of Columbia 6/21/2006 11-001-0043 0.083 ppm 119 24 100 44201 Ozone District Of Columbia District of Columbia 6/21/200624-003-0014 0.094ppm 147 24 100 44201 Ozone Maryland Anne Arundel 6/21/200624-005-3001 0.086ppm 127 24 100 44201 Ozone Maryland Baltimore 6/21/200624-009-0011 0.083 ppm 119 24 100 44201 Ozone Maryland Calvert 6/21/200624-017-0010 0.079ppm 109 24 100 44201 Ozone Maryland Charles 6/21/200624-025-1001 0.095 ppm 150 24 100 44201 Ozone Maryland Harford 6/21/200624-033-8003 0.096ppm 151 24 100 44201 Ozone Maryland Prince George's 6/21/2006 51-013-0020 0.083 ppm 119 24 100 44201 Ozone Virginia Arlington 6/21/2006 51-059-0030 0.081 ppm 114 24 100 44201 Ozone Virginia Fairfax 6/21/2006 51-179-0001 0.077ppm 104 24 100 44201 Ozone Virginia Stafford 6/22/2006 11-001-0041 0.076ppm 101 24 100 44201 Ozone District Of Columbia District of Columbia 6/22/2006 11-001-0043 0.078ppm 106 24 100 44201 Ozone District Of Columbia District of Columbia 6/22/200624-003-0014 0.084ppm 122 24 100 44201 Ozone Maryland Anne Arundel 6/22/200624-005-3001 0.085 ppm 124 24 100 44201 Ozone Maryland Baltimore 6/22/200624-009-0011 0.076ppm 101 24 100 44201 Ozone Maryland Calvert 6/22/200624-025-1001 0.094ppm 147 24 100 44201 Ozone Maryland Harford 6/22/200624-025-9001 0.09ppm 137 24 100 44201 Ozone Maryland Harford 6/22/200624-033-8003 0.083 ppm 119 24 100 44201 Ozone Maryland Prince George's 6/22/2006 51-013-0020 0.079ppm 109 24 100 44201 Ozone Virginia Arlington 6/22/2006 51-059-0030 0.08ppm 111 24 100 44201 Ozone Virginia Fairfax

6/28/200624-003-0014 0.077ppm 104 24 100 44201 Ozone Maryland Anne Arundel 6/28/200624-033-8003 0.079ppm 109 24 100 44201 Ozone Maryland Prince George's 6/29/200624-025-1001 0.079ppm 109 24 100 44201 Ozone Maryland Harford 6/29/200624-033-8003 0.076ppm 101 24 100 44201 Ozone Maryland Prince George'sDate AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

7/3/200624-003-0014 0.079ppm 109 24 100 44201 Ozone Maryland Anne Arundel 7/3/200624-025-1001 0.083 ppm 119 24 100 44201 Ozone Maryland Harford 7/3/200624-025-9001 0.08ppm 111 24 100 44201 Ozone Maryland Harford 7/3/200624-033-8003 0.08ppm 111 19 79 44201 Ozone Maryland Prince George's

7/10/200624-025-9001 0.077ppm 104 24 100 44201 Ozone Maryland Harford 7/11/2006 11-001-0025 0.08ppm 111 24 100 44201 Ozone District Of Columbia District of Columbia 7/11/2006 11-001-0043 0.08ppm 111 24 100 44201 Ozone District Of Columbia District of Columbia 7/11/200624-005-1007 0.082ppm 116 24 100 44201 Ozone Maryland Baltimore 7/11/200624-005-3001 0.083 ppm 119 24 100 44201 Ozone Maryland Baltimore 7/11/200624-025-1001 0.087ppm 129 24 100 44201 Ozone Maryland Harford 7/11/200624-025-9001 0.09ppm 137 24 100 44201 Ozone Maryland Harford 7/11/200624-033-0030 0.086ppm 127 24 100 44201 Ozone Maryland Prince George's 7/12/200624-005-3001 0.078ppm 106 24 100 44201 Ozone Maryland Baltimore

7/17/2006 11-001-0025 0.079ppm 109 24 100 44201 Ozone District Of Columbia District of Columbia 7/17/2006 11-001-0041 0.087ppm 129 24 100 44201 Ozone District Of Columbia District of Columbia 7/17/2006 11-001-0043 0.091 ppm 140 24 100 44201 Ozone District Of Columbia District of Columbia 7/17/200624-003-0014 0.094ppm 147 24 100 44201 Ozone Maryland Anne Arundel 7/17/200624-005-1007 0.078ppm 106 24 100 44201 Ozone Maryland Baltimore 7/17/200624-005-3001 0.091 ppm 140 24 100 44201 Ozone Maryland Baltimore 7/17/200624-017-0010 0.099ppm 159 24 100 44201 Ozone Maryland Charles 7/17/200624-021-0037 0.083 ppm 119 24 100 44201 Ozone Maryland Frederick 7/17/200624-025-1001 0.095 ppm 150 24 100 44201 Ozone Maryland Harford 7/17/200624-025-9001 0.083 ppm 119 24 100 44201 Ozone Maryland Harford 7/17/200624-033-0030 0.084ppm 122 24 100 44201 Ozone Maryland Prince George's 7/17/200624-033-8003 0.100ppm 161 24 100 44201 Ozone Maryland Prince George'sDate AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

7/17/2006 51-013-0020 0.095 ppm 150 24 100 44201 Ozone Virginia Arlington 7/17/2006 51-059-0030 0.107ppm 179 24 100 44201 Ozone Virginia Fairfax 7/17/2006 51-107-1005 0.080ppm 111 24 100 44201 Ozone Virginia Loudoun 7/17/2006 51-179-0001 0.088ppm 132 24 100 44201 Ozone Virginia Stafford 7/17/2006 51-510-0009 0.098ppm 156 24 100 44201 Ozone Virginia Alexandria City 7/18/2006 11-001-0025 0.083 ppm 119 24 100 44201 Ozone District Of Columbia District of Columbia 7/18/2006 11-001-0041 0.093 ppm 145 24 100 44201 Ozone District Of Columbia District of Columbia 7/18/2006 11-001-0043 0.096ppm 151 24 100 44201 Ozone District Of Columbia District of Columbia 7/18/200624-003-0014 0.105 ppm 174 24 100 44201 Ozone Maryland Anne Arundel 7/18/200624-005-3001 0.110ppm 187 24 100 44201 Ozone Maryland Baltimore 7/18/200624-009-0011 0.082ppm 116 24 100 44201 Ozone Maryland Calvert 7/18/200624-017-0010 0.094ppm 147 24 100 44201 Ozone Maryland Charles 7/18/200624-025-1001 0.100ppm 161 24 100 44201 Ozone Maryland Harford 7/18/200624-025-9001 0.085 ppm 124 24 100 44201 Ozone Maryland Harford 7/18/200624-033-0030 0.080ppm 111 24 100 44201 Ozone Maryland Prince George's 7/18/200624-033-8003 0.102ppm 166 24 100 44201 Ozone Maryland Prince George's 7/18/2006 51-013-0020 0.097ppm 154 24 100 44201 Ozone Virginia Arlington 7/18/2006 51-059-0030 0.109ppm 185 24 100 44201 Ozone Virginia Fairfax 7/18/2006 51-107-1005 0.076ppm 101 24 100 44201 Ozone Virginia Loudoun 7/18/2006 51-179-0001 0.109ppm 185 24 100 44201 Ozone Virginia Stafford 7/18/2006 51-510-0009 0.118ppm 202 24 100 44201 Ozone Virginia Alexandria City 7/19/2006 11-001-0025 0.079ppm 109 24 100 44201 Ozone District Of Columbia District of Columbia 7/19/2006 11-001-0041 0.080ppm 111 24 100 44201 Ozone District Of Columbia District of Columbia 7/19/2006 11-001-0043 0.087ppm 129 24 100 44201 Ozone District Of Columbia District of Columbia 7/19/200624-005-3001 0.081 ppm 114 24 100 44201 Ozone Maryland Baltimore 7/19/200624-025-1001 0.077ppm 104 24 100 44201 Ozone Maryland Harford 7/19/200624-025-9001 0.083 ppm 119 24 100 44201 Ozone Maryland Harford 7/19/200624-031-3001 0.082ppm 116 24 100 44201 Ozone Maryland MontgomeryDate AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

7/19/200624-033-0030 0.077ppm 104 24 100 44201 Ozone Maryland Prince George's 7/19/2006 51-013-0020 0.085 ppm 124 24 100 44201 Ozone Virginia Arlington 7/19/2006 51-059-0030 0.085 ppm 124 24 100 44201 Ozone Virginia Fairfax 7/19/2006 51-107-1005 0.088ppm 132 24 100 44201 Ozone Virginia Loudoun 7/19/2006 51-153-0009 0.080ppm 111 24 100 44201 Ozone Virginia Prince William 7/19/2006 51-179-0001 0.101 ppm 164 24 100 44201 Ozone Virginia Stafford 7/19/2006 51-510-0009 0.083 ppm 119 24 100 44201 Ozone Virginia Alexandria City 7/20/2006 11-001-0043 0.078ppm 106 24 100 44201 Ozone District Of Columbia District of Columbia 7/20/2006 51-013-0020 0.077ppm 104 24 100 44201 Ozone Virginia Arlington 7/20/2006 51-107-1005 0.079ppm 109 24 100 44201 Ozone Virginia Loudoun 7/21/200624-005-3001 0.079ppm 109 24 100 44201 Ozone Maryland Baltimore 7/21/200624-025-1001 0.081 ppm 114 24 100 44201 Ozone Maryland Harford 7/21/200624-025-9001 0.080ppm 111 24 100 44201 Ozone Maryland Harford 7/21/200624-033-0030 0.076ppm 101 24 100 44201 Ozone Maryland Prince George's 7/21/200624-033-8003 0.084ppm 122 24 100 44201 Ozone Maryland Prince George's

7/24/200624-025-1001 0.077ppm 104 24 100 44201 Ozone Maryland Harford

7/27/200624-025-1001 0.081 ppm 114 24 100 44201 Ozone Maryland Harford 7/27/200624-025-9001 0.081 ppm 114 24 100 44201 Ozone Maryland Harford 7/27/200624-033-0030 0.079ppm 109 24 100 44201 Ozone Maryland Prince George's

7/29/200624-005-3001 0.079ppm 109 24 100 44201 Ozone Maryland Baltimore 7/29/200624-025-1001 0.076ppm 101 24 100 44201 Ozone Maryland Harford

7/31/200624-003-0014 0.081 ppm 114 24 100 44201 Ozone Maryland Anne Arundel 7/31/200624-005-3001 0.087ppm 129 24 100 44201 Ozone Maryland Baltimore 7/31/200624-009-0011 0.086ppm 127 24 100 44201 Ozone Maryland CalvertDate AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

7/31/200624-017-0010 0.08ppm 111 24 100 44201 Ozone Maryland Charles 7/31/200624-033-8003 0.084ppm 122 24 100 44201 Ozone Maryland Prince George's 8/1/2006 11-001-0041 0.079ppm 109 24 100 44201 Ozone District Of Columbia District of Columbia 8/1/2006 11-001-0043 0.079ppm 109 24 100 44201 Ozone District Of Columbia District of Columbia 8/1/200624-003-0014 0.085 ppm 124 24 100 44201 Ozone Maryland Anne Arundel 8/1/200624-005-3001 0.081 ppm 114 24 100 44201 Ozone Maryland Baltimore 8/1/200624-009-0011 0.081 ppm 114 24 100 44201 Ozone Maryland Calvert 8/1/200624-017-0010 0.078ppm 106 24 100 44201 Ozone Maryland Charles 8/1/200624-025-1001 0.084ppm 122 24 100 44201 Ozone Maryland Harford 8/1/200624-033-8003 0.094ppm 147 24 100 44201 Ozone Maryland Prince George's 8/1/2006 51-013-0020 0.078ppm 106 24 100 44201 Ozone Virginia Arlington 8/1/2006 51-059-0030 0.078ppm 106 24 100 44201 Ozone Virginia Fairfax 8/1/2006 51-510-0009 0.08ppm 111 24 100 44201 Ozone Virginia Alexandria City 8/2/2006 11-001-0043 0.079ppm 109 24 100 44201 Ozone District Of Columbia District of Columbia 8/2/200624-003-0014 0.078ppm 106 24 100 44201 Ozone Maryland Anne Arundel 8/2/200624-005-1007 0.076ppm 101 24 100 44201 Ozone Maryland Baltimore 8/2/200624-005-3001 0.077ppm 104 24 100 44201 Ozone Maryland Baltimore 8/2/200624-009-0011 0.082ppm 116 24 100 44201 Ozone Maryland Calvert 8/2/200624-031-3001 0.079ppm 109 24 100 44201 Ozone Maryland Montgomery 8/2/200624-033-0030 0.084ppm 122 24 100 44201 Ozone Maryland Prince George's 8/2/200624-033-8003 0.083 ppm 119 24 100 44201 Ozone Maryland Prince George's 8/2/2006 51-013-0020 0.077ppm 104 24 100 44201 Ozone Virginia Arlington 8/2/2006 51-510-0009 0.076ppm 101 24 100 44201 Ozone Virginia Alexandria City 8/3/200624-033-0030 0.076ppm 101 24 100 44201 Ozone Maryland Prince George's 8/3/200624-033-8003 0.078ppm 106 24 100 44201 Ozone Maryland Prince George's

8/6/2006 11-001-0025 0.081 ppm 114 24 100 44201 Ozone District Of Columbia District of Columbia 8/6/2006 11-001-0043 0.084ppm 122 24 100 44201 Ozone District Of Columbia District of ColumbiaDate AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

8/6/200624-005-1007 0.081 ppm 114 24 100 44201 Ozone Maryland Baltimore 8/6/200624-005-3001 0.076ppm 101 24 100 44201 Ozone Maryland Baltimore 8/6/200624-013-0001 0.082ppm 116 24 100 44201 Ozone Maryland Carroll 8/6/200624-021-0037 0.076ppm 101 24 100 44201 Ozone Maryland Frederick 8/6/200624-031-3001 0.088ppm 132 24 100 44201 Ozone Maryland Montgomery 8/6/200624-033-0030 0.084ppm 122 24 100 44201 Ozone Maryland Prince George's 8/6/2006 51-510-0009 0.076ppm 101 24 100 44201 Ozone Virginia Alexandria City 8/7/2006 11-001-0041 0.079ppm 109 24 100 44201 Ozone District Of Columbia District of Columbia 8/7/2006 11-001-0043 0.077ppm 104 24 100 44201 Ozone District Of Columbia District of Columbia 8/7/200624-005-3001 0.08ppm 111 24 100 44201 Ozone Maryland Baltimore 8/7/200624-025-1001 0.089ppm 135 24 100 44201 Ozone Maryland Harford 8/7/200624-025-9001 0.092ppm 142 24 100 44201 Ozone Maryland Harford 8/7/200624-033-0030 0.083 ppm 119 24 100 44201 Ozone Maryland Prince George's 8/7/2006 51-510-0009 0.078ppm 106 24 100 44201 Ozone Virginia Alexandria City

8/13/200624-033-0030 0.076ppm 101 24 100 44201 Ozone Maryland Prince George's

8/16/2006 11-001-0043 0.079ppm 109 24 100 44201 Ozone District Of Columbia District of Columbia 8/16/200624-033-0030 0.077ppm 104 24 100 44201 Ozone Maryland Prince George's 8/16/2006 51-059-0030 0.085 ppm 124 24 100 44201 Ozone Virginia Fairfax 8/16/2006 51-179-0001 0.082ppm 116 24 100 44201 Ozone Virginia Stafford 8/16/2006 51-510-0009 0.076ppm 101 24 100 44201 Ozone Virginia Alexandria City 8/17/2006 51-061-0002 0.076ppm 101 24 100 44201 Ozone Virginia Fauquier 8/17/2006 51-107-1005 0.082ppm 116 24 100 44201 Ozone Virginia Loudoun 8/17/2006 51-153-0009 0.086ppm 127 24 100 44201 Ozone Virginia Prince William 8/18/200624-013-0001 0.078ppm 106 24 100 44201 Ozone Maryland Carroll 8/18/200624-021-0037 0.086ppm 127 24 100 44201 Ozone Maryland Frederick 8/18/2006 51-107-1005 0.084ppm 122 24 100 44201 Ozone Virginia LoudounDate AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

8/18/2006 51-153-0009 0.077ppm 104 24 100 44201 Ozone Virginia Prince William

8/22/2006 11-001-0041 0.081 ppm 114 24 100 44201 Ozone District Of Columbia District of Columbia 8/22/2006 11-001-0043 0.081 ppm 114 24 100 44201 Ozone District Of Columbia District of Columbia 8/22/200624-005-3001 0.088ppm 132 24 100 44201 Ozone Maryland Baltimore 8/22/200624-025-1001 0.087ppm 129 24 100 44201 Ozone Maryland Harford 8/22/200624-025-9001 0.079ppm 109 24 100 44201 Ozone Maryland Harford 8/22/200624-033-0030 0.076ppm 101 24 100 44201 Ozone Maryland Prince George's 8/22/200624-510-0054 0.078ppm 106 24 100 44201 Ozone Maryland Baltimore (City) 8/22/2006 51-013-0020 0.076ppm 101 24 100 44201 Ozone Virginia Arlington 8/22/2006 51-059-0030 0.081 ppm 114 24 100 44201 Ozone Virginia Fairfax 8/22/2006 51-510-0009 0.078ppm 106 24 100 44201 Ozone Virginia Alexandria City 8/23/2006 11-001-0025 0.081 ppm 114 24 100 44201 Ozone District Of Columbia District of Columbia 8/23/2006 11-001-0041 0.085 ppm 124 24 100 44201 Ozone District Of Columbia District of Columbia 8/23/2006 11-001-0043 0.090ppm 137 24 100 44201 Ozone District Of Columbia District of Columbia 8/23/200624-003-0014 0.090ppm 137 24 100 44201 Ozone Maryland Anne Arundel 8/23/200624-009-0011 0.090ppm 137 24 100 44201 Ozone Maryland Calvert 8/23/200624-017-0010 0.089ppm 135 24 100 44201 Ozone Maryland Charles 8/23/200624-021-0037 0.076ppm 101 24 100 44201 Ozone Maryland Frederick 8/23/200624-031-3001 0.077ppm 104 24 100 44201 Ozone Maryland Montgomery 8/23/200624-033-0030 0.081 ppm 114 24 100 44201 Ozone Maryland Prince George's 8/23/2006 51-013-0020 0.080ppm 111 24 100 44201 Ozone Virginia Arlington 8/23/2006 51-059-0030 0.087ppm 129 24 100 44201 Ozone Virginia Fairfax 8/23/2006 51-107-1005 0.082ppm 116 24 100 44201 Ozone Virginia Loudoun 8/23/2006 51-153-0009 0.077ppm 104 24 100 44201 Ozone Virginia Prince William 8/23/2006 51-179-0001 0.091 ppm 140 24 100 44201 Ozone Virginia Stafford 8/23/2006 51-510-0009 0.084ppm 122 24 100 44201 Ozone Virginia Alexandria City 8/24/2006 11-001-0041 0.085 ppm 124 24 100 44201 Ozone District Of Columbia District of ColumbiaDate AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

8/24/2006 11-001-0043 0.082ppm 116 24 100 44201 Ozone District Of Columbia District of Columbia 8/24/200624-003-0014 0.086ppm 127 24 100 44201 Ozone Maryland Anne Arundel 8/24/200624-005-3001 0.085 ppm 124 24 100 44201 Ozone Maryland Baltimore 8/24/200624-009-0011 0.087ppm 129 24 100 44201 Ozone Maryland Calvert 8/24/200624-017-0010 0.085 ppm 124 24 100 44201 Ozone Maryland Charles 8/24/200624-021-0037 0.077ppm 104 24 100 44201 Ozone Maryland Frederick 8/24/200624-025-1001 0.080ppm 111 24 100 44201 Ozone Maryland Harford 8/24/200624-033-0030 0.083 ppm 119 24 100 44201 Ozone Maryland Prince George's 8/24/2006 51-059-0030 0.080ppm 111 24 100 44201 Ozone Virginia Fairfax 8/24/2006 51-107-1005 0.077ppm 104 24 100 44201 Ozone Virginia Loudoun 8/24/2006 51-510-0009 0.076ppm 101 24 100 44201 Ozone Virginia Alexandria City 8/25/2006 11-001-0025 0.080ppm 111 24 100 44201 Ozone District Of Columbia District of Columbia 8/25/2006 11-001-0041 0.087ppm 129 24 100 44201 Ozone District Of Columbia District of Columbia 8/25/2006 11-001-0043 0.083 ppm 119 24 100 44201 Ozone District Of Columbia District of Columbia 8/25/200624-003-0014 0.084ppm 122 24 100 44201 Ozone Maryland Anne Arundel 8/25/200624-005-1007 0.076ppm 101 24 100 44201 Ozone Maryland Baltimore 8/25/200624-005-3001 0.098ppm 156 24 100 44201 Ozone Maryland Baltimore 8/25/200624-009-0011 0.080ppm 111 24 100 44201 Ozone Maryland Calvert 8/25/200624-013-0001 0.076ppm 101 24 100 44201 Ozone Maryland Carroll 8/25/200624-017-0010 0.078ppm 106 24 100 44201 Ozone Maryland Charles 8/25/200624-021-0037 0.085 ppm 124 24 100 44201 Ozone Maryland Frederick 8/25/200624-025-1001 0.085 ppm 124 24 100 44201 Ozone Maryland Harford 8/25/200624-025-9001 0.077ppm 104 24 100 44201 Ozone Maryland Harford 8/25/200624-031-3001 0.080ppm 111 24 100 44201 Ozone Maryland Montgomery 8/25/200624-033-0030 0.085 ppm 124 24 100 44201 Ozone Maryland Prince George's 8/25/200624-033-8003 0.095 ppm 150 15 63 44201 Ozone Maryland Prince George's 8/25/200624-510-0054 0.085 ppm 124 24 100 44201 Ozone Maryland Baltimore (City) 8/25/2006 51-013-0020 0.081 ppm 114 24 100 44201 Ozone Virginia ArlingtonDate AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

8/25/2006 51-059-0030 0.086ppm 127 24 100 44201 Ozone Virginia Fairfax 8/25/2006 51-107-1005 0.081 ppm 114 24 100 44201 Ozone Virginia Loudoun 8/25/2006 51-153-0009 0.076ppm 101 24 100 44201 Ozone Virginia Prince William 8/25/2006 51-510-0009 0.083 ppm 119 24 100 44201 Ozone Virginia Alexandria City 8/26/2006 51-061-0002 0.086ppm 127 24 100 44201 Ozone Virginia Fauquier 8/26/2006 51-107-1005 0.082ppm 116 24 100 44201 Ozone Virginia Loudoun 8/26/2006 51-153-0009 0.090ppm 137 24 100 44201 Ozone Virginia Prince William 8/26/2006 51-179-0001 0.081 ppm 114 24 100 44201 Ozone Virginia Stafford



## 2007 2007 2007 2007

5/22/2007 24-021-0037 0.078ppm 106 24 100 44201 Ozone Maryland Frederick

5/25/2007 11-001-0025 0.076ppm 101 24 100 44201 Ozone District Of Columbia District of Columbia 5/25/2007 11-001-0041 0.078ppm 106 24 100 44201 Ozone District Of Columbia District of Columbia 5/25/2007 24-021-0037 0.076ppm 101 24 100 44201 Ozone Maryland Frederick 5/25/2007 24-025-9001 0.078ppm 106 24 100 44201 Ozone Maryland Harford 5/25/2007 24-033-0030 0.077ppm 104 24 100 44201 Ozone Maryland Prince George's 5/25/2007 51-107-1005 0.080ppm 111 24 100 44201 Ozone Virginia Loudoun 5/26/2007 11-001-0041 0.078ppm 106 24 100 44201 Ozone District Of Columbia District of Columbia 5/26/2007 11-001-0043 0.079ppm 109 24 100 44201 Ozone District Of Columbia District of Columbia 5/26/2007 24-003-0014 0.085 ppm 124 24 100 44201 Ozone Maryland Anne Arundel 5/26/2007 24-005-3001 0.083 ppm 119 24 100 44201 Ozone Maryland Baltimore 5/26/2007 24-009-0011 0.079ppm 109 24 100 44201 Ozone Maryland Calvert 5/26/2007 24-017-0010 0.080ppm 111 24 100 44201 Ozone Maryland Charles 5/26/2007 24-033-8003 0.091 ppm 140 24 100 44201 Ozone Maryland Prince George's 5/26/2007 51-013-0020 0.080ppm 111 24 100 44201 Ozone Virginia Arlington 5/26/2007 51-059-0030 0.079ppm 109 24 100 44201 Ozone Virginia Fairfax 5/26/2007 51-510-0009 0.080ppm 111 24 100 44201 Ozone Virginia Alexandria CityDate AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

5/27/2007 24-025-1001 0.077ppm 104 24 100 44201 Ozone Maryland Harford 5/27/2007 24-025-9001 0.079ppm 109 24 100 44201 Ozone Maryland Harford

5/29/2007 11-001-0043 0.078ppm 106 24 100 44201 Ozone District Of Columbia District of Columbia 5/29/2007 24-003-0014 0.076ppm 101 24 100 44201 Ozone Maryland Anne Arundel 5/29/2007 51-059-0030 0.076ppm 101 24 100 44201 Ozone Virginia Fairfax 5/29/2007 51-179-0001 0.089ppm 135 24 100 44201 Ozone Virginia Stafford 5/30/2007 11-001-0025 0.084ppm 122 24 100 44201 Ozone District Of Columbia District of Columbia 5/30/2007 11-001-0041 0.087ppm 129 24 100 44201 Ozone District Of Columbia District of Columbia 5/30/2007 11-001-0043 0.086ppm 127 24 100 44201 Ozone District Of Columbia District of Columbia 5/30/2007 24-005-3001 0.080ppm 111 24 100 44201 Ozone Maryland Baltimore 5/30/2007 24-013-0001 0.080ppm 111 24 100 44201 Ozone Maryland Carroll 5/30/2007 24-017-0010 0.077ppm 104 24 100 44201 Ozone Maryland Charles 5/30/2007 24-021-0037 0.089ppm 135 24 100 44201 Ozone Maryland Frederick 5/30/2007 24-025-1001 0.089ppm 135 24 100 44201 Ozone Maryland Harford 5/30/2007 24-025-9001 0.100ppm 161 24 100 44201 Ozone Maryland Harford 5/30/2007 24-033-0030 0.085 ppm 124 17 71 44201 Ozone Maryland Prince George's 5/30/2007 24-033-8003 0.079ppm 109 24 100 44201 Ozone Maryland Prince George's 5/30/2007 51-013-0020 0.085 ppm 124 24 100 44201 Ozone Virginia Arlington 5/30/2007 51-059-0030 0.082ppm 116 24 100 44201 Ozone Virginia Fairfax 5/30/2007 51-107-1005 0.079ppm 109 24 100 44201 Ozone Virginia Loudoun 5/30/2007 51-153-0009 0.078ppm 106 24 100 44201 Ozone Virginia Prince William 5/30/2007 51-179-0001 0.083 ppm 119 24 100 44201 Ozone Virginia Stafford 5/30/2007 51-510-0009 0.081 ppm 114 24 100 44201 Ozone Virginia Alexandria City 5/31/2007 11-001-0043 0.076ppm 101 24 100 44201 Ozone District Of Columbia District of Columbia 5/31/2007 24-003-0014 0.077ppm 104 24 100 44201 Ozone Maryland Anne Arundel 5/31/2007 24-005-1007 0.076ppm 101 24 100 44201 Ozone Maryland Baltimore 5/31/2007 24-005-3001 0.078ppm 106 24 100 44201 Ozone Maryland BaltimoreDate AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

5/31/2007 24-009-0011 0.079ppm 109 24 100 44201 Ozone Maryland Calvert 5/31/2007 24-013-0001 0.088ppm 132 24 100 44201 Ozone Maryland Carroll 5/31/2007 24-017-0010 0.078ppm 106 24 100 44201 Ozone Maryland Charles 5/31/2007 24-021-0037 0.086ppm 127 24 100 44201 Ozone Maryland Frederick 5/31/2007 24-025-1001 0.086ppm 127 24 100 44201 Ozone Maryland Harford 5/31/2007 24-025-9001 0.086ppm 127 24 100 44201 Ozone Maryland Harford 5/31/2007 24-033-0030 0.084ppm 122 24 100 44201 Ozone Maryland Prince George's 5/31/2007 24-033-8003 0.080ppm 111 24 100 44201 Ozone Maryland Prince George's 5/31/2007 51-013-0020 0.077ppm 104 24 100 44201 Ozone Virginia Arlington 5/31/2007 51-107-1005 0.086ppm 127 24 100 44201 Ozone Virginia Loudoun 5/31/2007 51-153-0009 0.076ppm 101 24 100 44201 Ozone Virginia Prince William 5/31/2007 51-179-0001 0.076ppm 101 24 100 44201 Ozone Virginia Stafford 6/1/2007 11-001-0025 0.077ppm 104 24 100 44201 Ozone District Of Columbia District of Columbia 6/1/2007 24-013-0001 0.082ppm 116 24 100 44201 Ozone Maryland Carroll 6/1/2007 24-021-0037 0.076ppm 101 24 100 44201 Ozone Maryland Frederick 6/1/2007 24-025-1001 0.080ppm 111 24 100 44201 Ozone Maryland Harford 6/1/2007 24-025-9001 0.084ppm 122 24 100 44201 Ozone Maryland Harford 6/1/2007 24-033-0030 0.080ppm 111 24 100 44201 Ozone Maryland Prince George's 6/1/2007 51-013-0020 0.079ppm 109 24 100 44201 Ozone Virginia Arlington 6/1/2007 51-107-1005 0.076ppm 101 24 100 44201 Ozone Virginia Loudoun 6/2/2007 24-013-0001 0.079ppm 109 24 100 44201 Ozone Maryland Carroll

6/7/2007 11-001-0043 0.076ppm 101 24 100 44201 Ozone District Of Columbia District of Columbia 6/7/2007 24-013-0001 0.081 ppm 114 24 100 44201 Ozone Maryland Carroll 6/7/2007 51-013-0020 0.079ppm 109 24 100 44201 Ozone Virginia Arlington 6/7/2007 51-059-0030 0.078ppm 106 24 100 44201 Ozone Virginia Fairfax 6/8/2007 11-001-0041 0.076ppm 101 24 100 44201 Ozone District Of Columbia District of Columbia 6/8/2007 11-001-0043 0.077ppm 104 24 100 44201 Ozone District Of Columbia District of ColumbiaDate AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

6/8/2007 24-003-0014 0.085 ppm 124 24 100 44201 Ozone Maryland Anne Arundel 6/8/2007 24-005-3001 0.085 ppm 124 24 100 44201 Ozone Maryland Baltimore 6/8/2007 24-025-1001 0.099ppm 159 24 100 44201 Ozone Maryland Harford 6/8/2007 24-025-9001 0.108ppm 182 24 100 44201 Ozone Maryland Harford 6/8/2007 24-033-8003 0.078ppm 106 24 100 44201 Ozone Maryland Prince George's 6/8/2007 51-013-0020 0.081 ppm 114 24 100 44201 Ozone Virginia Arlington

6/11/2007 51-179-0001 0.076ppm 101 24 100 44201 Ozone Virginia Stafford

6/18/2007 11-001-0025 0.087ppm 129 24 100 44201 Ozone District Of Columbia District of Columbia 6/18/2007 11-001-0041 0.090ppm 137 24 100 44201 Ozone District Of Columbia District of Columbia 6/18/2007 11-001-0043 0.093 ppm 145 24 100 44201 Ozone District Of Columbia District of Columbia 6/18/2007 24-003-0014 0.103 ppm 169 24 100 44201 Ozone Maryland Anne Arundel 6/18/2007 24-005-3001 0.090ppm 137 24 100 44201 Ozone Maryland Baltimore 6/18/2007 24-009-0011 0.082ppm 116 24 100 44201 Ozone Maryland Calvert 6/18/2007 24-013-0001 0.081 ppm 114 24 100 44201 Ozone Maryland Carroll 6/18/2007 24-017-0010 0.100ppm 161 24 100 44201 Ozone Maryland Charles 6/18/2007 24-021-0037 0.083 ppm 119 24 100 44201 Ozone Maryland Frederick 6/18/2007 24-025-1001 0.088ppm 132 24 100 44201 Ozone Maryland Harford 6/18/2007 24-025-9001 0.082ppm 116 24 100 44201 Ozone Maryland Harford 6/18/2007 24-031-3001 0.076ppm 101 24 100 44201 Ozone Maryland Montgomery 6/18/2007 24-033-0030 0.082ppm 116 24 100 44201 Ozone Maryland Prince George's 6/18/2007 24-033-8003 0.097ppm 154 24 100 44201 Ozone Maryland Prince George's 6/18/2007 24-510-0054 0.085 ppm 124 24 100 44201 Ozone Maryland Baltimore (City) 6/18/2007 51-013-0020 0.085 ppm 124 24 100 44201 Ozone Virginia Arlington 6/18/2007 51-059-0030 0.090ppm 137 24 100 44201 Ozone Virginia Fairfax 6/18/2007 51-107-1005 0.087ppm 129 24 100 44201 Ozone Virginia Loudoun 6/18/2007 51-179-0001 0.085 ppm 124 24 100 44201 Ozone Virginia StaffordDate AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

6/18/2007 51-510-0009 0.084ppm 122 24 100 44201 Ozone Virginia Alexandria City 6/19/2007 11-001-0041 0.080ppm 111 24 100 44201 Ozone District Of Columbia District of Columbia 6/19/2007 11-001-0043 0.079ppm 109 24 100 44201 Ozone District Of Columbia District of Columbia 6/19/2007 24-009-0011 0.079ppm 109 24 100 44201 Ozone Maryland Calvert 6/19/2007 24-013-0001 0.092ppm 142 24 100 44201 Ozone Maryland Carroll 6/19/2007 24-017-0010 0.083 ppm 119 24 100 44201 Ozone Maryland Charles 6/19/2007 24-021-0037 0.080ppm 111 24 100 44201 Ozone Maryland Frederick 6/19/2007 24-025-1001 0.083 ppm 119 24 100 44201 Ozone Maryland Harford 6/19/2007 24-025-9001 0.082ppm 116 24 100 44201 Ozone Maryland Harford 6/19/2007 24-031-3001 0.077ppm 104 24 100 44201 Ozone Maryland Montgomery 6/19/2007 24-033-0030 0.079ppm 109 18 75 44201 Ozone Maryland Prince George's 6/19/2007 51-013-0020 0.088ppm 132 24 100 44201 Ozone Virginia Arlington 6/19/2007 51-059-0030 0.082ppm 116 24 100 44201 Ozone Virginia Fairfax 6/19/2007 51-107-1005 0.086ppm 127 24 100 44201 Ozone Virginia Loudoun 6/19/2007 51-510-0009 0.083 ppm 119 24 100 44201 Ozone Virginia Alexandria City

6/25/2007 24-013-0001 0.080ppm 111 24 100 44201 Ozone Maryland Carroll 6/25/2007 24-021-0037 0.077ppm 104 24 100 44201 Ozone Maryland Frederick 6/26/2007 11-001-0025 0.077ppm 104 24 100 44201 Ozone District Of Columbia District of Columbia 6/26/2007 24-013-0001 0.091 ppm 140 24 100 44201 Ozone Maryland Carroll 6/26/2007 24-017-0010 0.077ppm 104 24 100 44201 Ozone Maryland Charles 6/26/2007 24-021-0037 0.083 ppm 119 24 100 44201 Ozone Maryland Frederick 6/26/2007 24-025-9001 0.077ppm 104 24 100 44201 Ozone Maryland Harford 6/26/2007 24-031-3001 0.091 ppm 140 24 100 44201 Ozone Maryland Montgomery 6/26/2007 24-033-0030 0.076ppm 101 24 100 44201 Ozone Maryland Prince George's 6/26/2007 51-107-1005 0.081 ppm 114 24 100 44201 Ozone Virginia Loudoun 6/27/2007 24-005-3001 0.080ppm 111 24 100 44201 Ozone Maryland Baltimore 6/27/2007 24-025-1001 0.078ppm 106 24 100 44201 Ozone Maryland HarfordDate AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

6/27/2007 24-025-9001 0.092ppm 142 24 100 44201 Ozone Maryland Harford 6/27/2007 51-013-0020 0.078ppm 106 24 100 44201 Ozone Virginia Arlington 6/27/2007 51-059-0030 0.078ppm 106 24 100 44201 Ozone Virginia Fairfax 6/27/2007 51-510-0009 0.081 ppm 114 24 100 44201 Ozone Virginia Alexandria City

7/7/2007 24-003-0014 0.081 ppm 114 24 100 44201 Ozone Maryland Anne Arundel 7/7/2007 24-033-8003 0.078ppm 106 24 100 44201 Ozone Maryland Prince George's 7/8/2007 24-003-0014 0.077ppm 104 24 100 44201 Ozone Maryland Anne Arundel 7/8/2007 24-025-1001 0.091 ppm 140 24 100 44201 Ozone Maryland Harford 7/9/2007 11-001-0025 0.079ppm 109 24 100 44201 Ozone District Of Columbia District of Columbia 7/9/2007 11-001-0041 0.085 ppm 124 24 100 44201 Ozone District Of Columbia District of Columbia 7/9/2007 11-001-0043 0.085 ppm 124 24 100 44201 Ozone District Of Columbia District of Columbia 7/9/2007 24-003-0014 0.089ppm 135 24 100 44201 Ozone Maryland Anne Arundel 7/9/2007 24-005-3001 0.094ppm 147 24 100 44201 Ozone Maryland Baltimore 7/9/2007 24-009-0011 0.078ppm 106 24 100 44201 Ozone Maryland Calvert 7/9/2007 24-013-0001 0.081 ppm 114 24 100 44201 Ozone Maryland Carroll 7/9/2007 24-021-0037 0.076ppm 101 24 100 44201 Ozone Maryland Frederick 7/9/2007 24-025-1001 0.113 ppm 195 24 100 44201 Ozone Maryland Harford 7/9/2007 24-025-9001 0.113 ppm 195 24 100 44201 Ozone Maryland Harford 7/9/2007 24-031-3001 0.078ppm 106 24 100 44201 Ozone Maryland Montgomery 7/9/2007 24-033-0030 0.086ppm 127 24 100 44201 Ozone Maryland Prince George's 7/9/2007 24-033-8003 0.081 ppm 114 24 100 44201 Ozone Maryland Prince George's 7/9/2007 24-510-0054 0.079ppm 109 24 100 44201 Ozone Maryland Baltimore (City) 7/9/2007 51-013-0020 0.085 ppm 124 24 100 44201 Ozone Virginia Arlington 7/9/2007 51-059-0030 0.085 ppm 124 24 100 44201 Ozone Virginia Fairfax 7/9/2007 51-510-0009 0.085 ppm 124 24 100 44201 Ozone Virginia Alexandria City 7/10/2007 24-013-0001 0.076ppm 101 24 100 44201 Ozone Maryland CarrollDate AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

7/14/2007 24-025-1001 0.078ppm 106 24 100 44201 Ozone Maryland Harford 7/14/2007 24-025-9001 0.079ppm 109 24 100 44201 Ozone Maryland Harford 7/15/2007 24-025-9001 0.084ppm 122 24 100 44201 Ozone Maryland Harford 7/16/2007 24-003-0014 0.084ppm 122 24 100 44201 Ozone Maryland Anne Arundel 7/16/2007 24-033-8003 0.080ppm 111 24 100 44201 Ozone Maryland Prince George's 7/17/2007 11-001-0025 0.085 ppm 124 24 100 44201 Ozone District Of Columbia District of Columbia 7/17/2007 11-001-0041 0.091 ppm 140 24 100 44201 Ozone District Of Columbia District of Columbia 7/17/2007 11-001-0043 0.092ppm 142 24 100 44201 Ozone District Of Columbia District of Columbia 7/17/2007 24-003-0014 0.091 ppm 140 24 100 44201 Ozone Maryland Anne Arundel 7/17/2007 24-009-0011 0.076ppm 101 24 100 44201 Ozone Maryland Calvert 7/17/2007 24-013-0001 0.089ppm 135 24 100 44201 Ozone Maryland Carroll 7/17/2007 24-017-0010 0.083 ppm 119 24 100 44201 Ozone Maryland Charles 7/17/2007 24-021-0037 0.083 ppm 119 24 100 44201 Ozone Maryland Frederick 7/17/2007 24-031-3001 0.088ppm 132 24 100 44201 Ozone Maryland Montgomery 7/17/2007 24-033-0030 0.084ppm 122 24 100 44201 Ozone Maryland Prince George's 7/17/2007 24-033-8003 0.088ppm 132 24 100 44201 Ozone Maryland Prince George's 7/17/2007 51-013-0020 0.095 ppm 150 24 100 44201 Ozone Virginia Arlington 7/17/2007 51-059-0030 0.094ppm 147 24 100 44201 Ozone Virginia Fairfax 7/17/2007 51-107-1005 0.080ppm 111 24 100 44201 Ozone Virginia Loudoun 7/17/2007 51-153-0009 0.076ppm 101 24 100 44201 Ozone Virginia Prince William 7/17/2007 51-179-0001 0.088ppm 132 24 100 44201 Ozone Virginia Stafford 7/17/2007 51-510-0009 0.090ppm 137 24 100 44201 Ozone Virginia Alexandria City

7/26/2007 24-021-0037 0.082ppm 116 24 100 44201 Ozone Maryland Frederick 7/26/2007 24-031-3001 0.076ppm 101 24 100 44201 Ozone Maryland Montgomery 7/26/2007 51-107-1005 0.077ppm 104 24 100 44201 Ozone Virginia Loudoun

7/28/2007 11-001-0041 0.082ppm 116 24 100 44201 Ozone District Of Columbia District of ColumbiaDate AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

7/28/2007 24-005-3001 0.080ppm 111 24 100 44201 Ozone Maryland Baltimore 7/28/2007 24-025-1001 0.076ppm 101 24 100 44201 Ozone Maryland Harford 7/28/2007 24-033-0030 0.077ppm 104 24 100 44201 Ozone Maryland Prince George's 7/28/2007 51-013-0020 0.088ppm 132 24 100 44201 Ozone Virginia Arlington 7/28/2007 51-510-0009 0.078ppm 106 24 100 44201 Ozone Virginia Alexandria City

7/31/2007 24-003-0014 0.082ppm 116 24 100 44201 Ozone Maryland Anne Arundel 7/31/2007 24-033-8003 0.078ppm 106 24 100 44201 Ozone Maryland Prince George's 7/31/2007 51-059-0030 0.077ppm 104 24 100 44201 Ozone Virginia Fairfax 7/31/2007 51-179-0001 0.077ppm 104 24 100 44201 Ozone Virginia Stafford 8/1/2007 24-003-0014 0.084ppm 122 24 100 44201 Ozone Maryland Anne Arundel 8/1/2007 24-017-0010 0.077ppm 104 24 100 44201 Ozone Maryland Charles 8/1/2007 24-033-8003 0.081 ppm 114 24 100 44201 Ozone Maryland Prince George's 8/1/2007 51-013-0020 0.080ppm 111 24 100 44201 Ozone Virginia Arlington 8/1/2007 51-059-0030 0.080ppm 111 24 100 44201 Ozone Virginia Fairfax 8/1/2007 51-179-0001 0.085 ppm 124 24 100 44201 Ozone Virginia Stafford 8/1/2007 51-510-0009 0.076ppm 101 24 100 44201 Ozone Virginia Alexandria City 8/2/2007 11-001-0025 0.078ppm 106 24 100 44201 Ozone District Of Columbia District of Columbia 8/2/2007 24-003-0014 0.076ppm 101 24 100 44201 Ozone Maryland Anne Arundel 8/2/2007 24-005-3001 0.076ppm 101 24 100 44201 Ozone Maryland Baltimore 8/2/2007 24-013-0001 0.095 ppm 150 24 100 44201 Ozone Maryland Carroll 8/2/2007 24-021-0037 0.088ppm 132 24 100 44201 Ozone Maryland Frederick 8/2/2007 24-025-1001 0.081 ppm 114 24 100 44201 Ozone Maryland Harford 8/2/2007 24-025-9001 0.085 ppm 124 24 100 44201 Ozone Maryland Harford 8/2/2007 24-031-3001 0.103 ppm 169 24 100 44201 Ozone Maryland Montgomery 8/2/2007 24-033-0030 0.084ppm 122 24 100 44201 Ozone Maryland Prince George's 8/2/2007 24-033-8003 0.076ppm 101 24 100 44201 Ozone Maryland Prince George's 8/2/2007 51-107-1005 0.091 ppm 140 24 100 44201 Ozone Virginia LoudounDate AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

8/2/2007 51-179-0001 0.079ppm 109 24 100 44201 Ozone Virginia Stafford 8/3/2007 11-001-0025 0.083 ppm 119 24 100 44201 Ozone District Of Columbia District of Columbia 8/3/2007 24-013-0001 0.077ppm 104 24 100 44201 Ozone Maryland Carroll 8/3/2007 24-017-0010 0.077ppm 104 24 100 44201 Ozone Maryland Charles 8/3/2007 24-025-1001 0.078ppm 106 24 100 44201 Ozone Maryland Harford 8/3/2007 24-025-9001 0.081 ppm 114 24 100 44201 Ozone Maryland Harford 8/3/2007 24-031-3001 0.083 ppm 119 24 100 44201 Ozone Maryland Montgomery 8/3/2007 24-033-0030 0.077ppm 104 24 100 44201 Ozone Maryland Prince George's 8/4/2007 11-001-0025 0.079ppm 109 24 100 44201 Ozone District Of Columbia District of Columbia 8/4/2007 11-001-0041 0.089ppm 135 24 100 44201 Ozone District Of Columbia District of Columbia 8/4/2007 11-001-0043 0.087ppm 129 24 100 44201 Ozone District Of Columbia District of Columbia 8/4/2007 24-003-0014 0.118ppm 202 24 100 44201 Ozone Maryland Anne Arundel 8/4/2007 24-005-3001 0.082ppm 116 24 100 44201 Ozone Maryland Baltimore 8/4/2007 24-009-0011 0.089ppm 135 24 100 44201 Ozone Maryland Calvert 8/4/2007 24-013-0001 0.077ppm 104 24 100 44201 Ozone Maryland Carroll 8/4/2007 24-017-0010 0.092ppm 142 24 100 44201 Ozone Maryland Charles 8/4/2007 24-021-0037 0.079ppm 109 24 100 44201 Ozone Maryland Frederick 8/4/2007 24-025-1001 0.087ppm 129 24 100 44201 Ozone Maryland Harford 8/4/2007 24-025-9001 0.082ppm 116 24 100 44201 Ozone Maryland Harford 8/4/2007 24-031-3001 0.082ppm 116 24 100 44201 Ozone Maryland Montgomery 8/4/2007 24-033-0030 0.082ppm 116 24 100 44201 Ozone Maryland Prince George's 8/4/2007 24-033-8003 0.110ppm 187 24 100 44201 Ozone Maryland Prince George's 8/4/2007 51-013-0020 0.088ppm 132 24 100 44201 Ozone Virginia Arlington 8/4/2007 51-059-0030 0.088ppm 132 24 100 44201 Ozone Virginia Fairfax 8/4/2007 51-107-1005 0.080ppm 111 24 100 44201 Ozone Virginia Loudoun 8/4/2007 51-179-0001 0.081 ppm 114 24 100 44201 Ozone Virginia Stafford 8/4/2007 51-510-0009 0.085 ppm 124 24 100 44201 Ozone Virginia Alexandria City 8/5/2007 24-013-0001 0.079ppm 109 24 100 44201 Ozone Maryland CarrollDate AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

8/5/2007 51-107-1005 0.079ppm 109 24 100 44201 Ozone Virginia Loudoun 8/5/2007 51-153-0009 0.076ppm 101 24 100 44201 Ozone Virginia Prince William 8/6/2007 24-025-1001 0.085 ppm 124 24 100 44201 Ozone Maryland Harford 8/6/2007 24-025-9001 0.077ppm 104 24 100 44201 Ozone Maryland Harford 8/7/2007 11-001-0025 0.087ppm 129 24 100 44201 Ozone District Of Columbia District of Columbia 8/7/2007 11-001-0041 0.091 ppm 140 24 100 44201 Ozone District Of Columbia District of Columbia 8/7/2007 11-001-0043 0.089ppm 135 24 100 44201 Ozone District Of Columbia District of Columbia 8/7/2007 24-003-0014 0.080ppm 111 24 100 44201 Ozone Maryland Anne Arundel 8/7/2007 24-005-3001 0.076ppm 101 24 100 44201 Ozone Maryland Baltimore 8/7/2007 24-017-0010 0.080ppm 111 24 100 44201 Ozone Maryland Charles 8/7/2007 24-025-1001 0.082ppm 116 24 100 44201 Ozone Maryland Harford 8/7/2007 24-033-0030 0.089ppm 135 24 100 44201 Ozone Maryland Prince George's 8/7/2007 24-033-8003 0.082ppm 116 24 100 44201 Ozone Maryland Prince George's 8/7/2007 51-013-0020 0.086ppm 127 24 100 44201 Ozone Virginia Arlington 8/7/2007 51-059-0030 0.079ppm 109 24 100 44201 Ozone Virginia Fairfax 8/7/2007 51-510-0009 0.083 ppm 119 24 100 44201 Ozone Virginia Alexandria City

8/12/2007 24-005-3001 0.076ppm 101 24 100 44201 Ozone Maryland Baltimore 8/12/2007 24-025-1001 0.087ppm 129 24 100 44201 Ozone Maryland Harford 8/13/2007 24-017-0010 0.076ppm 101 24 100 44201 Ozone Maryland Charles 8/14/2007 24-017-0010 0.077ppm 104 24 100 44201 Ozone Maryland Charles 8/15/2007 11-001-0025 0.079ppm 109 24 100 44201 Ozone District Of Columbia District of Columbia 8/15/2007 11-001-0041 0.085 ppm 124 24 100 44201 Ozone District Of Columbia District of Columbia 8/15/2007 11-001-0043 0.084ppm 122 24 100 44201 Ozone District Of Columbia District of Columbia 8/15/2007 24-003-0014 0.089ppm 135 24 100 44201 Ozone Maryland Anne Arundel 8/15/2007 24-005-3001 0.077ppm 104 24 100 44201 Ozone Maryland Baltimore 8/15/2007 24-025-1001 0.090ppm 137 24 100 44201 Ozone Maryland Harford 8/15/2007 24-025-9001 0.085 ppm 124 24 100 44201 Ozone Maryland HarfordDate AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

8/15/2007 24-033-8003 0.080ppm 111 24 100 44201 Ozone Maryland Prince George's 8/15/2007 51-013-0020 0.084ppm 122 24 100 44201 Ozone Virginia Arlington 8/15/2007 51-059-0030 0.078ppm 106 24 100 44201 Ozone Virginia Fairfax 8/16/2007 24-009-0011 0.076ppm 101 24 100 44201 Ozone Maryland Calvert 8/17/2007 24-003-0014 0.084ppm 122 24 100 44201 Ozone Maryland Anne Arundel 8/17/2007 24-025-1001 0.084ppm 122 24 100 44201 Ozone Maryland Harford 8/17/2007 24-033-8003 0.080ppm 111 24 100 44201 Ozone Maryland Prince George's

8/24/2007 24-013-0001 0.080ppm 111 24 100 44201 Ozone Maryland Carroll 8/24/2007 24-031-3001 0.077ppm 104 24 100 44201 Ozone Maryland Montgomery 8/25/2007 24-013-0001 0.080ppm 111 24 100 44201 Ozone Maryland Carroll 8/25/2007 24-017-0010 0.077ppm 104 24 100 44201 Ozone Maryland Charles 8/25/2007 24-025-1001 0.081 ppm 114 24 100 44201 Ozone Maryland Harford 8/25/2007 24-025-9001 0.083 ppm 119 24 100 44201 Ozone Maryland Harford 8/25/2007 24-031-3001 0.088ppm 132 24 100 44201 Ozone Maryland Montgomery

8/30/2007 11-001-0041 0.078ppm 106 24 100 44201 Ozone District Of Columbia District of Columbia 8/30/2007 11-001-0043 0.076ppm 101 24 100 44201 Ozone District Of Columbia District of Columbia 8/30/2007 24-003-0014 0.076ppm 101 24 100 44201 Ozone Maryland Anne Arundel 8/30/2007 24-025-1001 0.086ppm 127 24 100 44201 Ozone Maryland Harford 8/30/2007 24-025-9001 0.085 ppm 124 24 100 44201 Ozone Maryland Harford 8/30/2007 51-013-0020 0.077ppm 104 24 100 44201 Ozone Virginia Arlington

9/4/2007 24-017-0010 0.078ppm 106 24 100 44201 Ozone Maryland Charles 9/5/2007 11-001-0041 0.076ppm 101 24 100 44201 Ozone District Of Columbia District of Columbia 9/5/2007 24-013-0001 0.089ppm 135 24 100 44201 Ozone Maryland Carroll 9/5/2007 24-021-0037 0.088ppm 132 24 100 44201 Ozone Maryland Frederick 9/5/2007 24-025-1001 0.077ppm 104 24 100 44201 Ozone Maryland HarfordDate AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

9/5/2007 24-025-9001 0.079ppm 109 24 100 44201 Ozone Maryland Harford 9/5/2007 24-031-3001 0.082ppm 116 24 100 44201 Ozone Maryland Montgomery 9/5/2007 51-107-1005 0.087ppm 129 24 100 44201 Ozone Virginia Loudoun 9/5/2007 51-153-0009 0.082ppm 116 24 100 44201 Ozone Virginia Prince William 9/6/2007 24-013-0001 0.076ppm 101 24 100 44201 Ozone Maryland Carroll 9/6/2007 24-021-0037 0.078ppm 106 24 100 44201 Ozone Maryland Frederick 9/6/2007 24-031-3001 0.076ppm 101 24 100 44201 Ozone Maryland Montgomery 9/7/2007 24-013-0001 0.085 ppm 124 24 100 44201 Ozone Maryland Carroll 9/7/2007 24-021-0037 0.081 ppm 114 24 100 44201 Ozone Maryland Frederick 9/7/2007 24-031-3001 0.083 ppm 119 24 100 44201 Ozone Maryland Montgomery 9/8/2007 24-013-0001 0.078ppm 106 24 100 44201 Ozone Maryland Carroll 9/8/2007 24-031-3001 0.078ppm 106 24 100 44201 Ozone Maryland Montgomery

9/25/2007 24-013-0001 0.087ppm 129 24 100 44201 Ozone Maryland Carroll 9/25/2007 24-021-0037 0.086ppm 127 24 100 44201 Ozone Maryland Frederick 9/25/2007 24-031-3001 0.076ppm 101 24 100 44201 Ozone Maryland Montgomery 9/25/2007 51-107-1005 0.078ppm 106 24 100 44201 Ozone Virginia Loudoun 9/26/2007 24-003-0014 0.080ppm 111 24 100 44201 Ozone Maryland Anne Arundel 9/26/2007 24-009-0011 0.078ppm 106 24 100 44201 Ozone Maryland Calvert 9/26/2007 24-017-0010 0.084ppm 122 24 100 44201 Ozone Maryland Charles 9/26/2007 24-025-1001 0.084ppm 122 24 100 44201 Ozone Maryland Harford 9/26/2007 24-025-9001 0.082ppm 116 24 100 44201 Ozone Maryland Harford 9/26/2007 24-031-3001 0.079ppm 109 24 100 44201 Ozone Maryland Montgomery 9/26/2007 24-033-8003 0.076ppm 101 24 100 44201 Ozone Maryland Prince George's 9/26/2007 51-013-0020 0.077ppm 104 24 100 44201 Ozone Virginia Arlington

10/9/2007 24-003-0014 0.079ppm 109 24 100 44201 Ozone Maryland Anne Arundel 10/9/2007 51-013-0020 0.076ppm 101 24 100 44201 Ozone Virginia ArlingtonDate AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

2008 2008 2008 2008

4/18/2008 24-003-0014 0.087ppm 129 24 100 44201 Ozone Maryland Anne Arundel 4/18/2008 24-005-3001 0.079ppm 109 24 100 44201 Ozone Maryland Baltimore 4/18/2008 24-009-0011 0.079ppm 109 24 100 44201 Ozone Maryland Calvert 4/18/2008 24-017-0010 0.083 ppm 119 24 100 44201 Ozone Maryland Charles 4/18/2008 24-025-1001 0.086ppm 127 24 100 44201 Ozone Maryland Harford 4/18/2008 24-025-9001 0.085 ppm 124 24 100 44201 Ozone Maryland Harford 4/18/2008 24-033-0030 0.077ppm 104 24 100 44201 Ozone Maryland Prince George's 4/18/2008 24-033-8003 0.079ppm 109 24 100 44201 Ozone Maryland Prince George's 4/18/2008 51-153-0009 0.076ppm 101 24 100 44201 Ozone Virginia Prince William 4/19/2008 24-003-0014 0.081 ppm 114 24 100 44201 Ozone Maryland Anne Arundel 4/19/2008 24-005-3001 0.077ppm 104 24 100 44201 Ozone Maryland Baltimore 4/19/2008 24-009-0011 0.076ppm 101 24 100 44201 Ozone Maryland Calvert 4/19/2008 24-013-0001 0.077ppm 104 24 100 44201 Ozone Maryland Carroll 4/19/2008 24-025-1001 0.082ppm 116 24 100 44201 Ozone Maryland Harford 4/19/2008 24-025-9001 0.082ppm 116 24 100 44201 Ozone Maryland Harford 4/19/2008 24-033-0030 0.077ppm 104 24 100 44201 Ozone Maryland Prince George's 4/19/2008 24-033-8003 0.076ppm 101 24 100 44201 Ozone Maryland Prince George's

5/7/2008 24-031-3001 0.076ppm 101 24 100 44201 Ozone Maryland Montgomery

5/30/2008 24-013-0001 0.076ppm 101 24 100 44201 Ozone Maryland Carroll

6/7/2008 24-003-0014 0.077ppm 104 24 100 44201 Ozone Maryland Anne Arundel 6/7/2008 24-025-1001 0.088ppm 132 24 100 44201 Ozone Maryland Harford 6/7/2008 24-025-9001 0.092ppm 142 24 100 44201 Ozone Maryland Harford 6/7/2008 24-033-8003 0.081 ppm 114 24 100 44201 Ozone Maryland Prince George'sDate AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

6/10/2008 24-005-1007 0.099ppm 159 24 100 44201 Ozone Maryland Baltimore 6/10/2008 24-013-0001 0.079ppm 109 24 100 44201 Ozone Maryland Carroll 6/10/2008 24-025-9001 0.08ppm 111 24 100 44201 Ozone Maryland Harford 6/10/2008 24-031-3001 0.085 ppm 124 24 100 44201 Ozone Maryland Montgomery 6/10/2008 24-033-0030 0.085 ppm 124 24 100 44201 Ozone Maryland Prince George's 6/10/2008 51-013-0020 0.08ppm 111 24 100 44201 Ozone Virginia Arlington

6/12/2008 11-001-0025 0.089ppm 135 24 100 44201 Ozone District Of Columbia District of Columbia 6/12/2008 11-001-0041 0.086ppm 127 24 100 44201 Ozone District Of Columbia District of Columbia 6/12/2008 11-001-0043 0.096ppm 151 24 100 44201 Ozone District Of Columbia District of Columbia 6/12/2008 24-003-0014 0.076ppm 101 24 100 44201 Ozone Maryland Anne Arundel 6/12/2008 24-005-3001 0.078ppm 106 24 100 44201 Ozone Maryland Baltimore 6/12/2008 24-017-0010 0.078ppm 106 24 100 44201 Ozone Maryland Charles 6/12/2008 24-025-1001 0.079ppm 109 24 100 44201 Ozone Maryland Harford 6/12/2008 24-033-8003 0.08ppm 111 24 100 44201 Ozone Maryland Prince George's 6/12/2008 51-013-0020 0.093 ppm 145 24 100 44201 Ozone Virginia Arlington 6/12/2008 51-059-0030 0.085 ppm 124 24 100 44201 Ozone Virginia Fairfax 6/12/2008 51-153-0009 0.082ppm 116 18 75 44201 Ozone Virginia Prince William 6/12/2008 51-510-0009 0.077ppm 104 24 100 44201 Ozone Virginia Alexandria City 6/13/2008 11-001-0043 0.078ppm 106 24 100 44201 Ozone District Of Columbia District of Columbia 6/13/2008 24-003-0014 0.078ppm 106 24 100 44201 Ozone Maryland Anne Arundel 6/13/2008 24-005-1007 0.097ppm 154 24 100 44201 Ozone Maryland Baltimore 6/13/2008 24-005-3001 0.081 ppm 114 24 100 44201 Ozone Maryland Baltimore 6/13/2008 24-013-0001 0.096ppm 151 24 100 44201 Ozone Maryland Carroll 6/13/2008 24-017-0010 0.076ppm 101 24 100 44201 Ozone Maryland Charles 6/13/2008 24-021-0037 0.085 ppm 124 24 100 44201 Ozone Maryland Frederick 6/13/2008 24-025-1001 0.085 ppm 124 24 100 44201 Ozone Maryland HarfordDate AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

6/13/2008 24-025-9001 0.083 ppm 119 24 100 44201 Ozone Maryland Harford 6/13/2008 24-031-3001 0.094ppm 147 24 100 44201 Ozone Maryland Montgomery 6/13/2008 24-033-0030 0.085 ppm 124 24 100 44201 Ozone Maryland Prince George's 6/13/2008 24-033-8003 0.077ppm 104 24 100 44201 Ozone Maryland Prince George's 6/13/2008 51-013-0020 0.079ppm 109 24 100 44201 Ozone Virginia Arlington 6/14/2008 24-005-3001 0.081 ppm 114 24 100 44201 Ozone Maryland Baltimore 6/14/2008 24-025-1001 0.093 ppm 145 24 100 44201 Ozone Maryland Harford 6/14/2008 24-025-9001 0.089ppm 135 24 100 44201 Ozone Maryland Harford

6/21/2008 11-001-0041 0.077ppm 104 24 100 44201 Ozone District Of Columbia District of Columbia 6/21/2008 11-001-0043 0.078ppm 106 24 100 44201 Ozone District Of Columbia District of Columbia 6/21/2008 24-005-1007 0.087ppm 129 24 100 44201 Ozone Maryland Baltimore 6/21/2008 24-005-3001 0.081 ppm 114 24 100 44201 Ozone Maryland Baltimore 6/21/2008 24-025-9001 0.079ppm 109 24 100 44201 Ozone Maryland Harford 6/21/2008 24-031-3001 0.076ppm 101 24 100 44201 Ozone Maryland Montgomery 6/21/2008 24-033-0030 0.08ppm 111 24 100 44201 Ozone Maryland Prince George's 6/21/2008 51-013-0020 0.076ppm 101 24 100 44201 Ozone Virginia Arlington

6/25/2008 24-025-9001 0.076ppm 101 24 100 44201 Ozone Maryland Harford

7/3/2008 24-025-1001 0.089ppm 135 24 100 44201 Ozone Maryland Harford 7/3/2008 24-025-9001 0.079ppm 109 24 100 44201 Ozone Maryland Harford

7/8/2008 24-025-9001 0.08ppm 111 24 100 44201 Ozone Maryland Harford

7/11/2008 24-003-0014 0.076ppm 101 24 100 44201 Ozone Maryland Anne Arundel 7/11/2008 24-005-3001 0.084ppm 122 24 100 44201 Ozone Maryland Baltimore 7/11/2008 24-025-1001 0.100ppm 161 24 100 44201 Ozone Maryland HarfordDate AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

7/11/2008 24-025-9001 0.076ppm 101 24 100 44201 Ozone Maryland Harford 7/12/2008 24-021-0037 0.076ppm 101 24 100 44201 Ozone Maryland Frederick 7/12/2008 24-025-1001 0.079ppm 109 24 100 44201 Ozone Maryland Harford

7/15/2008 11-001-0041 0.081 ppm 114 24 100 44201 Ozone District Of Columbia District of Columbia 7/15/2008 11-001-0043 0.079ppm 109 24 100 44201 Ozone District Of Columbia District of Columbia 7/15/2008 24-003-0014 0.081 ppm 114 24 100 44201 Ozone Maryland Anne Arundel 7/15/2008 51-013-0020 0.081 ppm 114 24 100 44201 Ozone Virginia Arlington 7/16/2008 11-001-0041 0.087ppm 129 24 100 44201 Ozone District Of Columbia District of Columbia 7/16/2008 11-001-0043 0.084ppm 122 24 100 44201 Ozone District Of Columbia District of Columbia 7/16/2008 24-003-0014 0.077ppm 104 24 100 44201 Ozone Maryland Anne Arundel 7/16/2008 24-005-1007 0.08ppm 111 24 100 44201 Ozone Maryland Baltimore 7/16/2008 24-005-3001 0.078ppm 106 24 100 44201 Ozone Maryland Baltimore 7/16/2008 24-017-0010 0.078ppm 106 24 100 44201 Ozone Maryland Charles 7/16/2008 24-025-1001 0.081 ppm 114 24 100 44201 Ozone Maryland Harford 7/16/2008 24-033-0030 0.081 ppm 114 24 100 44201 Ozone Maryland Prince George's 7/16/2008 24-033-8003 0.076ppm 101 24 100 44201 Ozone Maryland Prince George's 7/16/2008 51-013-0020 0.084ppm 122 24 100 44201 Ozone Virginia Arlington 7/16/2008 51-059-0030 0.088ppm 132 24 100 44201 Ozone Virginia Fairfax 7/16/2008 51-179-0001 0.085 ppm 124 24 100 44201 Ozone Virginia Stafford 7/17/2008 11-001-0025 0.087ppm 129 24 100 44201 Ozone District Of Columbia District of Columbia 7/17/2008 11-001-0041 0.092ppm 142 24 100 44201 Ozone District Of Columbia District of Columbia 7/17/2008 11-001-0043 0.100ppm 161 24 100 44201 Ozone District Of Columbia District of Columbia 7/17/2008 24-003-0014 0.087ppm 129 24 100 44201 Ozone Maryland Anne Arundel 7/17/2008 24-005-3001 0.08ppm 111 24 100 44201 Ozone Maryland Baltimore 7/17/2008 24-009-0011 0.08ppm 111 24 100 44201 Ozone Maryland Calvert 7/17/2008 24-017-0010 0.089ppm 135 24 100 44201 Ozone Maryland Charles 7/17/2008 24-025-1001 0.088ppm 132 24 100 44201 Ozone Maryland HarfordDate AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

7/17/2008 24-033-0030 0.081 ppm 114 24 100 44201 Ozone Maryland Prince George's 7/17/2008 24-033-8003 0.08ppm 111 24 100 44201 Ozone Maryland Prince George's 7/17/2008 51-013-0020 0.104ppm 172 24 100 44201 Ozone Virginia Arlington 7/17/2008 51-059-0030 0.095 ppm 150 24 100 44201 Ozone Virginia Fairfax 7/17/2008 51-510-0009 0.09ppm 137 24 100 44201 Ozone Virginia Alexandria City 7/18/2008 11-001-0025 0.083 ppm 119 24 100 44201 Ozone District Of Columbia District of Columbia 7/18/2008 11-001-0041 0.082ppm 116 24 100 44201 Ozone District Of Columbia District of Columbia 7/18/2008 11-001-0043 0.086ppm 127 24 100 44201 Ozone District Of Columbia District of Columbia 7/18/2008 24-003-0014 0.077ppm 104 24 100 44201 Ozone Maryland Anne Arundel 7/18/2008 24-005-1007 0.088ppm 132 24 100 44201 Ozone Maryland Baltimore 7/18/2008 24-005-3001 0.099ppm 159 24 100 44201 Ozone Maryland Baltimore 7/18/2008 24-013-0001 0.083 ppm 119 24 100 44201 Ozone Maryland Carroll 7/18/2008 24-017-0010 0.076ppm 101 24 100 44201 Ozone Maryland Charles 7/18/2008 24-025-1001 0.102ppm 166 24 100 44201 Ozone Maryland Harford 7/18/2008 24-025-9001 0.099ppm 159 24 100 44201 Ozone Maryland Harford 7/18/2008 24-031-3001 0.082ppm 116 24 100 44201 Ozone Maryland Montgomery 7/18/2008 24-033-0030 0.097ppm 154 24 100 44201 Ozone Maryland Prince George's 7/18/2008 24-033-8003 0.076ppm 101 24 100 44201 Ozone Maryland Prince George's 7/18/2008 24-510-0054 0.082ppm 116 24 100 44201 Ozone Maryland Baltimore (City) 7/18/2008 51-013-0020 0.089ppm 135 24 100 44201 Ozone Virginia Arlington 7/18/2008 51-059-0030 0.078ppm 106 24 100 44201 Ozone Virginia Fairfax 7/18/2008 51-510-0009 0.077ppm 104 24 100 44201 Ozone Virginia Alexandria City

7/28/2008 24-025-1001 0.081 ppm 114 24 100 44201 Ozone Maryland Harford 7/29/2008 24-005-1007 0.087ppm 129 24 100 44201 Ozone Maryland Baltimore 7/29/2008 24-005-3001 0.076ppm 101 24 100 44201 Ozone Maryland Baltimore 7/29/2008 24-013-0001 0.078ppm 106 24 100 44201 Ozone Maryland Carroll 7/29/2008 24-025-1001 0.085 ppm 124 24 100 44201 Ozone Maryland HarfordDate AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

7/29/2008 24-025-9001 0.087ppm 129 24 100 44201 Ozone Maryland Harford 7/29/2008 24-033-0030 0.078ppm 106 24 100 44201 Ozone Maryland Prince George's

8/19/2008 24-009-0011 0.076ppm 101 24 100 44201 Ozone Maryland Calvert 8/19/2008 24-017-0010 0.077ppm 104 24 100 44201 Ozone Maryland Charles

8/25/2008 24-003-0014 0.079ppm 109 24 100 44201 Ozone Maryland Anne Arundel 8/25/2008 24-033-8003 0.078ppm 106 24 100 44201 Ozone Maryland Prince George's

9/3/2008 11-001-0043 0.080ppm 111 24 100 44201 Ozone District Of Columbia District of Columbia 9/3/2008 24-003-0014 0.086ppm 127 24 100 44201 Ozone Maryland Anne Arundel 9/3/2008 24-009-0011 0.087ppm 129 24 100 44201 Ozone Maryland Calvert 9/3/2008 24-017-0010 0.086ppm 127 24 100 44201 Ozone Maryland Charles 9/3/2008 24-033-8003 0.079ppm 109 24 100 44201 Ozone Maryland Prince George's 9/3/2008 51-059-0030 0.085 ppm 124 24 100 44201 Ozone Virginia Fairfax 9/4/2008 24-003-0014 0.079ppm 109 24 100 44201 Ozone Maryland Anne Arundel 9/4/2008 24-009-0011 0.077ppm 104 24 100 44201 Ozone Maryland Calvert 9/4/2008 24-017-0010 0.077ppm 104 24 100 44201 Ozone Maryland Charles 9/4/2008 24-021-0037 0.082ppm 116 24 100 44201 Ozone Maryland Frederick 9/4/2008 24-025-1001 0.08ppm 111 24 100 44201 Ozone Maryland Harford 9/4/2008 51-059-0030 0.077ppm 104 24 100 44201 Ozone Virginia Fairfax



## 2010 2010 2010 2010

4/26/2009 24-025-1001 0.078ppm 106 24 100 44201 Ozone Maryland Harford

6/8/2009 11-001-0025 0.082ppm 116 24 100 44201 Ozone District Of Columbia District of Columbia 6/8/2009 11-001-0041 0.078ppm 106 24 100 44201 Ozone District Of Columbia District of Columbia 6/8/2009 11-001-0043 0.085 ppm 124 24 100 44201 Ozone District Of Columbia District of ColumbiaDate AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

6/8/2009 24-005-1007 0.076ppm 101 24 100 44201 Ozone Maryland Baltimore 6/8/2009 24-033-0030 0.076ppm 101 24 100 44201 Ozone Maryland Prince George's 6/8/2009 51-013-0020 0.078ppm 106 24 100 44201 Ozone Virginia Arlington

6/25/2009 24-005-3001 0.086ppm 127 24 100 44201 Ozone Maryland Baltimore 6/25/2009 24-009-0011 0.076ppm 101 24 100 44201 Ozone Maryland Calvert 6/25/2009 24-025-1001 0.109ppm 185 24 100 44201 Ozone Maryland Harford 6/25/2009 24-025-9001 0.079ppm 109 24 100 44201 Ozone Maryland Harford 6/26/2009 11-001-0041 0.08ppm 111 18 75 44201 Ozone District Of Columbia District of Columbia 6/26/2009 11-001-0043 0.076ppm 101 24 100 44201 Ozone District Of Columbia District of Columbia 6/26/2009 24-025-1001 0.091 ppm 140 24 100 44201 Ozone Maryland Harford 6/26/2009 24-025-9001 0.081 ppm 114 24 100 44201 Ozone Maryland Harford 6/26/2009 51-013-0020 0.077ppm 104 24 100 44201 Ozone Virginia Arlington 6/26/2009 24-033-0030 ??? ppm 101 24 100 44201 Ozone Maryland Prince George's

7/13/2009 24-025-1001 0.077ppm 104 24 100 44201 Ozone Maryland Harford 7/15/2009 24-025-1001 0.082ppm 116 24 100 44201 Ozone Maryland Harford 7/16/2009 24-025-1001 0.081 ppm 114 24 100 44201 Ozone Maryland Harford 8/16/2009 24-025-1001 0.085 ppm 124 24 100 44201 Ozone Maryland Harford 8/18/2009 24-025-1001 0.083 ppm 119 24 100 44201 Ozone Maryland Harford

8/27/2009 24-025-1001 0.076ppm 101 24 100 44201 Ozone Maryland Harford 8/27/2009 51-059-0030 0.08ppm 111 24 100 44201 Ozone Virginia Fairfax



## 2010 2010 2010 2010

5/5/201024-025-1001 0.077ppm 104 16 67 44201 Ozone Maryland Harford 5/21/201024-025-1001 0.076ppm 101 24 100 44201 Ozone Maryland HarfordDate AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

5/27/2010 11-001-0043 0.080ppm 111 24 100 44201 Ozone District Of Columbia District of Columbia 5/27/201024-003-0014 0.078ppm 106 24 100 44201 Ozone Maryland Anne Arundel 5/27/201024-005-3001 0.079ppm 109 24 100 44201 Ozone Maryland Baltimore 5/27/201024-025-1001 0.089ppm 135 24 100 44201 Ozone Maryland Harford 5/27/201024-033-0030 0.087ppm 129 24 100 44201 Ozone Maryland Prince George's 5/27/201051-013-0020 0.083 ppm 119 24 100 44201 Ozone Virginia Arlington 5/27/201051-059-0030 0.088ppm 132 24 100 44201 Ozone Virginia Fairfax 5/27/201051-179-0001 0.080ppm 111 24 100 44201 Ozone Virginia Stafford 5/27/201051-510-0009 0.078ppm 106 24 100 44201 Ozone Virginia Alexandria City

6/2/2010 11-001-0043 0.078ppm 106 24 100 44201 Ozone District Of Columbia District of Columbia 6/2/201024-025-1001 0.087ppm 129 24 100 44201 Ozone Maryland Harford 6/2/201024-025-9001 0.076ppm 101 24 100 44201 Ozone Maryland Harford 6/2/201024-033-0030 0.080ppm 111 24 100 44201 Ozone Maryland Prince George's

6/4/201024-033-0030 0.076ppm 101 24 100 44201 Ozone Maryland Prince George's

6/12/201024-031-3001 0.079ppm 109 24 100 44201 Ozone Maryland Montgomery

6/18/201051-059-0030 0.083 ppm 119 13 54 44201 Ozone Virginia Fairfax

6/21/201024-009-0011 0.082ppm 116 24 100 44201 Ozone Maryland Calvert 6/21/201024-017-0010 0.076ppm 101 24 100 44201 Ozone Maryland Charles 6/21/201024-033-8003 0.077ppm 104 24 100 44201 Ozone Maryland Prince George's 6/22/2010 11-001-0041 0.077ppm 104 24 100 44201 Ozone District Of Columbia District of Columbia 6/22/2010 11-001-0043 0.077ppm 104 24 100 44201 Ozone District Of Columbia District of Columbia 6/22/201024-005-1007 0.085 ppm 124 24 100 44201 Ozone Maryland Baltimore 6/22/201024-005-3001 0.079ppm 109 24 100 44201 Ozone Maryland BaltimoreDate AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

6/22/201024-025-1001 0.087ppm 129 24 100 44201 Ozone Maryland Harford 6/22/201024-025-9001 0.081 ppm 114 24 100 44201 Ozone Maryland Harford 6/22/201024-031-3001 0.077ppm 104 24 100 44201 Ozone Maryland Montgomery 6/22/201024-033-0030 0.091 ppm 140 24 100 44201 Ozone Maryland Prince George's 6/22/201051-013-0020 0.079ppm 109 24 100 44201 Ozone Virginia Arlington 6/23/201024-009-0011 0.076ppm 101 24 100 44201 Ozone Maryland Calvert 6/23/201024-025-1001 0.082ppm 116 24 100 44201 Ozone Maryland Harford

6/25/201024-005-3001 0.081 ppm 114 24 100 44201 Ozone Maryland Baltimore 6/25/201024-025-1001 0.087ppm 129 24 100 44201 Ozone Maryland Harford 6/25/201024-033-8003 0.080ppm 111 24 100 44201 Ozone Maryland Prince George's 6/26/201024-005-3001 0.078ppm 106 24 100 44201 Ozone Maryland Baltimore 6/26/201024-025-1001 0.087ppm 129 24 100 44201 Ozone Maryland Harford 6/26/201024-025-9001 0.086ppm 127 24 100 44201 Ozone Maryland Harford 6/26/201024-033-0030 0.076ppm 101 24 100 44201 Ozone Maryland Prince George's 6/27/201024-025-1001 0.079ppm 109 24 100 44201 Ozone Maryland Harford

7/3/2010 11-001-0041 0.076ppm 101 24 100 44201 Ozone District Of Columbia District of Columbia 7/3/2010 11-001-0043 0.078ppm 106 24 100 44201 Ozone District Of Columbia District of Columbia 7/3/201024-025-1001 0.08ppm 111 24 100 44201 Ozone Maryland Harford 7/3/201024-033-0030 0.082ppm 116 24 100 44201 Ozone Maryland Prince George's 7/4/2010 11-001-0041 0.086ppm 127 24 100 44201 Ozone District Of Columbia District of Columbia 7/4/2010 11-001-0043 0.078ppm 106 24 100 44201 Ozone District Of Columbia District of Columbia 7/4/201024-005-3001 0.08ppm 111 24 100 44201 Ozone Maryland Baltimore 7/4/201024-025-1001 0.09ppm 137 24 100 44201 Ozone Maryland Harford 7/4/201024-033-0030 0.076ppm 101 24 100 44201 Ozone Maryland Prince George's 7/4/201051-013-0020 0.078ppm 106 24 100 44201 Ozone Virginia Arlington 7/4/201051-059-0030 0.076ppm 101 24 100 44201 Ozone Virginia FairfaxDate AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

7/5/201024-003-0014 0.077ppm 104 24 100 44201 Ozone Maryland Anne Arundel 7/5/201024-005-3001 0.084ppm 122 24 100 44201 Ozone Maryland Baltimore 7/5/201024-009-0011 0.082ppm 116 24 100 44201 Ozone Maryland Calvert 7/5/201024-017-0010 0.080ppm 111 24 100 44201 Ozone Maryland Charles 7/5/201024-025-1001 0.097ppm 154 24 100 44201 Ozone Maryland Harford 7/5/201024-025-9001 0.078ppm 106 24 100 44201 Ozone Maryland Harford 7/5/201024-033-8003 0.080ppm 111 24 100 44201 Ozone Maryland Prince George's 7/6/2010 11-001-0041 0.079ppm 109 24 100 44201 Ozone District Of Columbia District of Columbia 7/6/2010 11-001-0043 0.082ppm 116 24 100 44201 Ozone District Of Columbia District of Columbia 7/6/201024-003-0014 0.099ppm 159 24 100 44201 Ozone Maryland Anne Arundel 7/6/201024-005-3001 0.09ppm 137 24 100 44201 Ozone Maryland Baltimore 7/6/201024-009-0011 0.087ppm 129 24 100 44201 Ozone Maryland Calvert 7/6/201024-013-0001 0.078ppm 106 24 100 44201 Ozone Maryland Carroll 7/6/201024-017-0010 0.087ppm 129 24 100 44201 Ozone Maryland Charles 7/6/201024-021-0037 0.084ppm 122 24 100 44201 Ozone Maryland Frederick 7/6/201024-025-1001 0.092ppm 142 24 100 44201 Ozone Maryland Harford 7/6/201024-033-0030 0.076ppm 101 24 100 44201 Ozone Maryland Prince George's 7/6/201024-033-8003 0.090ppm 137 24 100 44201 Ozone Maryland Prince George's 7/6/201051-013-0020 0.076ppm 101 24 100 44201 Ozone Virginia Arlington 7/6/201051-059-0030 0.078ppm 106 24 100 44201 Ozone Virginia Fairfax 7/7/2010 11-001-0025 0.087ppm 129 24 100 44201 Ozone District Of Columbia District of Columbia 7/7/2010 11-001-0041 0.096ppm 151 24 100 44201 Ozone District Of Columbia District of Columbia 7/7/2010 11-001-0043 0.100ppm 161 24 100 44201 Ozone District Of Columbia District of Columbia 7/7/201024-003-0014 0.082ppm 116 24 100 44201 Ozone Maryland Anne Arundel 7/7/201024-005-3001 0.084ppm 122 24 100 44201 Ozone Maryland Baltimore 7/7/201024-009-0011 0.090ppm 137 24 100 44201 Ozone Maryland Calvert 7/7/201024-013-0001 0.085 ppm 124 24 100 44201 Ozone Maryland Carroll 7/7/201024-017-0010 0.082ppm 116 24 100 44201 Ozone Maryland CharlesDate AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

7/7/201024-021-0037 0.077ppm 104 24 100 44201 Ozone Maryland Frederick 7/7/201024-025-1001 0.088ppm 132 24 100 44201 Ozone Maryland Harford 7/7/201024-033-0030 0.094ppm 147 24 100 44201 Ozone Maryland Prince George's 7/7/201024-033-8003 0.085 ppm 124 23 96 44201 Ozone Maryland Prince George's 7/7/201051-013-0020 0.092ppm 142 24 100 44201 Ozone Virginia Arlington 7/7/201051-059-0030 0.095 ppm 150 24 100 44201 Ozone Virginia Fairfax 7/7/201051-179-0001 0.088ppm 132 24 100 44201 Ozone Virginia Stafford 7/7/201051-510-0009 0.092ppm 142 24 100 44201 Ozone Virginia Alexandria City 7/8/201024-013-0001 0.083 ppm 119 24 100 44201 Ozone Maryland Carroll 7/8/201024-021-0037 0.093 ppm 145 24 100 44201 Ozone Maryland Frederick 7/8/201051-153-0009 0.093 ppm 145 24 100 44201 Ozone Virginia Prince William

7/15/2010 11-001-0041 0.076ppm 101 24 100 44201 Ozone District Of Columbia District of Columbia 7/15/2010 11-001-0043 0.078ppm 106 24 100 44201 Ozone District Of Columbia District of Columbia 7/15/201024-003-0014 0.076ppm 101 24 100 44201 Ozone Maryland Anne Arundel 7/15/201051-013-0020 0.078ppm 106 24 100 44201 Ozone Virginia Arlington 7/16/201024-025-1001 0.086ppm 127 18 75 44201 Ozone Maryland Harford 7/16/201024-025-9001 0.08ppm 111 24 100 44201 Ozone Maryland Harford 7/17/201024-025-1001 0.086ppm 127 24 100 44201 Ozone Maryland Harford

7/23/201024-003-0014 0.082ppm 116 24 100 44201 Ozone Maryland Anne Arundel 7/23/201024-005-3001 0.082ppm 116 24 100 44201 Ozone Maryland Baltimore 7/23/201024-025-1001 0.101 ppm 164 24 100 44201 Ozone Maryland Harford 7/23/201024-025-9001 0.086ppm 127 24 100 44201 Ozone Maryland Harford

7/27/201024-005-1007 0.078ppm 106 24 100 44201 Ozone Maryland Baltimore 7/27/201024-013-0001 0.08ppm 111 24 100 44201 Ozone Maryland Carroll 7/28/201024-033-0030 0.077ppm 104 24 100 44201 Ozone Maryland Prince George'sDate AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

7/31/201024-005-1007 0.076ppm 101 24 100 44201 Ozone Maryland Baltimore 7/31/201024-025-1001 0.078ppm 106 24 100 44201 Ozone Maryland Harford

8/7/2010 11-001-0041 0.077ppm 104 24 100 44201 Ozone District Of Columbia District of Columbia

8/9/201024-005-1007 0.076ppm 101 24 100 44201 Ozone Maryland Baltimore 8/9/201024-025-1001 0.076ppm 101 24 100 44201 Ozone Maryland Harford 8/9/201024-033-0030 0.079ppm 109 24 100 44201 Ozone Maryland Prince George's 8/10/2010 11-001-0025 0.080ppm 111 24 100 44201 Ozone District Of Columbia District of Columbia 8/10/2010 11-001-0041 0.090ppm 137 24 100 44201 Ozone District Of Columbia District of Columbia 8/10/2010 11-001-0043 0.080ppm 111 24 100 44201 Ozone District Of Columbia District of Columbia 8/10/201024-003-0014 0.099ppm 159 24 100 44201 Ozone Maryland Anne Arundel 8/10/201024-005-1007 0.086ppm 127 24 100 44201 Ozone Maryland Baltimore 8/10/201024-005-3001 0.115 ppm 200 24 100 44201 Ozone Maryland Baltimore 8/10/201024-009-0011 0.079ppm 109 24 100 44201 Ozone Maryland Calvert 8/10/201024-013-0001 0.083 ppm 119 24 100 44201 Ozone Maryland Carroll 8/10/201024-017-0010 0.077ppm 104 24 100 44201 Ozone Maryland Charles 8/10/201024-021-0037 0.085 ppm 124 24 100 44201 Ozone Maryland Frederick 8/10/201024-025-1001 0.110ppm 187 24 100 44201 Ozone Maryland Harford 8/10/201024-033-0030 0.082ppm 116 24 100 44201 Ozone Maryland Prince George's 8/10/201024-033-8003 0.090ppm 137 24 100 44201 Ozone Maryland Prince George's 8/10/201024-510-0054 0.100ppm 161 24 100 44201 Ozone Maryland Baltimore (City) 8/10/201051-013-0020 0.088ppm 132 17 71 44201 Ozone Virginia Arlington 8/10/201051-059-0030 0.082ppm 116 24 100 44201 Ozone Virginia Fairfax 8/10/201051-510-0009 0.081 ppm 114 24 100 44201 Ozone Virginia Alexandria City 8/11/2010 11-001-0025 0.079ppm 109 24 100 44201 Ozone District Of Columbia District of ColumbiaDate AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

8/11/2010 11-001-0041 0.085 ppm 124 24 100 44201 Ozone District Of Columbia District of Columbia 8/11/2010 11-001-0043 0.081 ppm 114 24 100 44201 Ozone District Of Columbia District of Columbia 8/11/201024-003-0014 0.096ppm 151 24 100 44201 Ozone Maryland Anne Arundel 8/11/201024-009-0011 0.097ppm 154 24 100 44201 Ozone Maryland Calvert 8/11/201024-017-0010 0.093 ppm 145 24 100 44201 Ozone Maryland Charles 8/11/201024-033-0030 0.080ppm 111 24 100 44201 Ozone Maryland Prince George's 8/11/201024-033-8003 0.088ppm 132 24 100 44201 Ozone Maryland Prince George's 8/11/201051-013-0020 0.085 ppm 124 24 100 44201 Ozone Virginia Arlington 8/11/201051-059-0030 0.089ppm 135 24 100 44201 Ozone Virginia Fairfax 8/11/201051-510-0009 0.082ppm 116 24 100 44201 Ozone Virginia Alexandria City

8/17/2010 11-001-0025 0.078ppm 106 24 100 44201 Ozone District Of Columbia District of Columbia 8/17/2010 11-001-0041 0.089ppm 135 24 100 44201 Ozone District Of Columbia District of Columbia 8/17/2010 11-001-0043 0.079ppm 109 24 100 44201 Ozone District Of Columbia District of Columbia 8/17/201024-003-0014 0.081 ppm 114 13 54 44201 Ozone Maryland Anne Arundel 8/17/201051-013-0020 0.089ppm 135 24 100 44201 Ozone Virginia Arlington 8/17/201051-059-0030 0.089ppm 135 24 100 44201 Ozone Virginia Fairfax 8/17/201051-179-0001 0.078ppm 106 24 100 44201 Ozone Virginia Stafford 8/17/201051-510-0009 0.085 ppm 124 24 100 44201 Ozone Virginia Alexandria City

8/19/2010 11-001-0041 0.086ppm 127 24 100 44201 Ozone District Of Columbia District of Columbia 8/19/2010 11-001-0043 0.081 ppm 114 24 100 44201 Ozone District Of Columbia District of Columbia 8/19/201024-005-3001 0.087ppm 129 24 100 44201 Ozone Maryland Baltimore 8/19/201024-025-1001 0.093 ppm 145 24 100 44201 Ozone Maryland Harford 8/19/201051-059-0030 0.078ppm 106 24 100 44201 Ozone Virginia Fairfax 8/19/201051-510-0009 0.077ppm 104 24 100 44201 Ozone Virginia Alexandria City 8/20/2010 11-001-0041 0.079ppm 109 24 100 44201 Ozone District Of Columbia District of Columbia 8/20/2010 11-001-0043 0.081 ppm 114 24 100 44201 Ozone District Of Columbia District of ColumbiaDate AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

8/20/201024-003-0014 0.084ppm 122 24 100 44201 Ozone Maryland Anne Arundel 8/20/201024-005-3001 0.076ppm 101 24 100 44201 Ozone Maryland Baltimore 8/20/201024-033-8003 0.077ppm 104 24 100 44201 Ozone Maryland Prince George's 8/20/201051-013-0020 0.077ppm 104 24 100 44201 Ozone Virginia Arlington 8/20/201051-059-0030 0.080ppm 111 24 100 44201 Ozone Virginia Fairfax 8/20/201051-179-0001 0.076ppm 101 24 100 44201 Ozone Virginia Stafford 8/20/201051-510-0009 0.080ppm 111 24 100 44201 Ozone Virginia Alexandria City

8/28/201051-013-0020 0.076ppm 101 24 100 44201 Ozone Virginia Arlington 8/29/2010 11-001-0041 0.080ppm 111 24 100 44201 Ozone District Of Columbia District of Columbia 8/29/201024-003-0014 0.078ppm 106 24 100 44201 Ozone Maryland Anne Arundel 8/29/201024-025-1001 0.096ppm 151 24 100 44201 Ozone Maryland Harford 8/29/201051-510-0009 0.078ppm 106 24 100 44201 Ozone Virginia Alexandria City 8/30/2010 11-001-0043 0.077ppm 104 24 100 44201 Ozone District Of Columbia District of Columbia 8/30/201024-003-0014 0.087ppm 129 24 100 44201 Ozone Maryland Anne Arundel 8/30/201024-005-3001 0.078ppm 106 17 71 44201 Ozone Maryland Baltimore 8/30/201024-009-0011 0.098ppm 156 24 100 44201 Ozone Maryland Calvert 8/30/201024-017-0010 0.087ppm 129 24 100 44201 Ozone Maryland Charles 8/30/201024-025-1001 0.076ppm 101 24 100 44201 Ozone Maryland Harford 8/30/201024-033-0030 0.076ppm 101 24 100 44201 Ozone Maryland Prince George's 8/30/201024-033-8003 0.084ppm 122 24 100 44201 Ozone Maryland Prince George's 8/30/201051-013-0020 0.085 ppm 124 24 100 44201 Ozone Virginia Arlington 8/30/201051-059-0030 0.091 ppm 140 24 100 44201 Ozone Virginia Fairfax 8/30/201051-153-0009 0.079ppm 109 24 100 44201 Ozone Virginia Prince William 8/30/201051-179-0001 0.086ppm 127 24 100 44201 Ozone Virginia Stafford 8/30/201051-510-0009 0.081 ppm 114 24 100 44201 Ozone Virginia Alexandria City 8/31/2010 11-001-0025 0.077ppm 104 24 100 44201 Ozone District Of Columbia District of Columbia 8/31/2010 11-001-0041 0.085 ppm 124 24 100 44201 Ozone District Of Columbia District of ColumbiaDate AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

8/31/2010 11-001-0043 0.088ppm 132 24 100 44201 Ozone District Of Columbia District of Columbia 8/31/201024-005-3001 0.08ppm 111 24 100 44201 Ozone Maryland Baltimore 8/31/201024-025-1001 0.09ppm 137 24 100 44201 Ozone Maryland Harford 8/31/201024-031-3001 0.077ppm 104 24 100 44201 Ozone Maryland Montgomery 8/31/201051-013-0020 0.087ppm 129 19 79 44201 Ozone Virginia Arlington 8/31/201051-059-0030 0.086ppm 127 24 100 44201 Ozone Virginia Fairfax 8/31/201051-510-0009 0.081 ppm 114 24 100 44201 Ozone Virginia Alexandria City 9/1/2010 11-001-0025 0.085 ppm 124 24 100 44201 Ozone District Of Columbia District of Columbia 9/1/2010 11-001-0041 0.080ppm 111 24 100 44201 Ozone District Of Columbia District of Columbia 9/1/2010 11-001-0043 0.086ppm 127 24 100 44201 Ozone District Of Columbia District of Columbia 9/1/201024-005-3001 0.078ppm 106 24 100 44201 Ozone Maryland Baltimore 9/1/201024-025-1001 0.09ppm 137 24 100 44201 Ozone Maryland Harford 9/1/201024-025-9001 0.078ppm 106 24 100 44201 Ozone Maryland Harford 9/1/201024-031-3001 0.080ppm 111 24 100 44201 Ozone Maryland Montgomery 9/1/201024-033-0030 0.085 ppm 124 24 100 44201 Ozone Maryland Prince George's 9/1/201024-510-0054 0.077ppm 104 24 100 44201 Ozone Maryland Baltimore (City) 9/2/201024-005-1007 0.092ppm 142 24 100 44201 Ozone Maryland Baltimore 9/2/201024-013-0001 0.084ppm 122 24 100 44201 Ozone Maryland Carroll 9/2/201024-021-0037 0.083 ppm 119 24 100 44201 Ozone Maryland Frederick 9/2/201024-025-1001 0.082ppm 116 24 100 44201 Ozone Maryland Harford 9/2/201024-031-3001 0.081 ppm 114 24 100 44201 Ozone Maryland Montgomery 9/2/201024-033-0030 0.076ppm 101 24 100 44201 Ozone Maryland Prince George's 9/3/201024-021-0037 0.083 ppm 119 24 100 44201 Ozone Maryland Frederick

9/23/201024-021-0037 0.076ppm 101 24 100 44201 Ozone Maryland Frederick 9/23/201051-059-0030 0.080ppm 111 24 100 44201 Ozone Virginia Fairfax 9/24/201024-025-1001 0.077ppm 104 18 75 44201 Ozone Maryland HarfordDate AQS SITE ID Daily Max 8-hour Ozone Concentration UNITS DAILY AQI VALUE DAILY OBS

COUNT PERCENT

COMPLETE AQS

PARAMETER CODE AQS

PARAMETER DESC STATE COUNTY

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DC-MD-VAWV Combined Statistical Area (CSA) 2008 Ozone National Ambient Air Quality Standards TABLE A2-1: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

9/24/201024-025-9001 0.077ppm 104 24 100 44201 Ozone Maryland Harford