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 6/7/2008 11-001-0025 0.049ppm 42 24 100 44201 Ozone District Of Columbia District of Columbia 6/7/2008 11-001-0041 0.06ppm 51 24 100 44201 Ozone District Of Columbia District of Columbia 6/7/2008 11-001-0043 0.057ppm 48 24 100 44201 Ozone District Of Columbia District of Columbia 6/7/2008 24-003-0014 0.077ppm 104 24 100 44201 Ozone Maryland Anne Arundel 6/7/2008 24-005-1007 0.06ppm 51 24 100 44201 Ozone Maryland Baltimore 6/7/2008 24-005-3001 0.072ppm 90 24 100 44201 Ozone Maryland Baltimore 6/7/2008 24-009-0011 0.06ppm 51 24 100 44201 Ozone Maryland Calvert 6/7/2008 24-013-0001 0.058ppm 49 24 100 44201 Ozone Maryland Carroll 6/7/2008 24-017-0010 0.061 ppm 54 24 100 44201 Ozone Maryland Charles 6/7/2008 24-021-0037 0.057ppm 48 24 100 44201 Ozone Maryland Frederick 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 24-031-3001 0.061 ppm 54 24 100 44201 Ozone Maryland Montgomery 6/7/2008 24-033-0030 0.064ppm 64 24 100 44201 Ozone Maryland Prince George's 6/7/2008 24-033-8003 0.081 ppm 114 24 100 44201 Ozone Maryland Prince George's 6/7/2008 24-510-0054 0.042ppm 36 24 100 44201 Ozone Maryland Baltimore (City) 6/7/2008 51-059-0030 0.065 ppm 67 24 100 44201 Ozone Virginia Fairfax 6/7/2008 51-061-0002 0.04ppm 34 24 100 44201 Ozone Virginia Fauquier 6/7/2008 51-107-1005 0.055 ppm 47 24 100 44201 Ozone Virginia Loudoun 6/7/2008 51-153-0009 0.052ppm 44 24 100 44201 Ozone Virginia Prince William 6/7/2008 51-179-0001 0.04ppm 34 24 100 44201 Ozone Virginia Stafford

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 24-005-1007 0.068ppm 77 24 100 44201 Ozone Maryland Baltimore 6/12/2008 24-005-3001 0.078ppm 106 24 100 44201 Ozone Maryland Baltimore 6/12/2008 24-009-0011 0.068ppm 77 24 100 44201 Ozone Maryland Calvert 6/12/2008 24-013-0001 0.064ppm 64 24 100 44201 Ozone Maryland Carroll

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DCTABLE A2-2: 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

6/12/2008 24-017-0010 0.078ppm 106 24 100 44201 Ozone Maryland Charles 6/12/2008 24-021-0037 0.071 ppm 87 24 100 44201 Ozone Maryland Frederick 6/12/2008 24-025-1001 0.079ppm 109 24 100 44201 Ozone Maryland Harford 6/12/2008 24-025-9001 0.074ppm 97 24 100 44201 Ozone Maryland Harford 6/12/2008 24-031-3001 0.075 ppm 100 24 100 44201 Ozone Maryland Montgomery 6/12/2008 24-033-8003 0.08ppm 111 24 100 44201 Ozone Maryland Prince George's 6/12/2008 24-510-0054 0.053 ppm 45 24 100 44201 Ozone Maryland Baltimore (City) 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 51-061-0002 0.069ppm 80 24 100 44201 Ozone Virginia Fauquier 6/12/2008 51-153-0009 0.082ppm 116 18 75 44201 Ozone Virginia Prince William 6/12/2008 51-179-0001 0.065 ppm 67 24 100 44201 Ozone Virginia Stafford 6/12/2008 51-510-0009 0.077ppm 104 24 100 44201 Ozone Virginia Alexandria City

6/13/2008 11-001-0025 0.074ppm 97 24 100 44201 Ozone District Of Columbia District of Columbia 6/13/2008 11-001-0041 0.075 ppm 100 24 100 44201 Ozone District Of Columbia District of Columbia 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 24-009-0011 0.075 ppm 100 24 100 44201 Ozone Maryland Calvert 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 Harford 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 24-510-0054 0.059ppm 50 24 100 44201 Ozone Maryland Baltimore (City)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

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

6/13/2008 51-013-0020 0.079ppm 109 24 100 44201 Ozone Virginia Arlington 6/13/2008 51-059-0030 0.074ppm 97 24 100 44201 Ozone Virginia Fairfax 6/13/2008 51-061-0002 0.058ppm 49 24 100 44201 Ozone Virginia Fauquier 6/13/2008 51-153-0009 0.071 ppm 87 24 100 44201 Ozone Virginia Prince William 6/13/2008 51-179-0001 0.071 ppm 87 19 79 44201 Ozone Virginia Stafford 6/13/2008 51-510-0009 0.071 ppm 87 24 100 44201 Ozone Virginia Alexandria City

6/14/2008 11-001-0025 0.057ppm 48 24 100 44201 Ozone District Of Columbia District of Columbia 6/14/2008 11-001-0041 0.066ppm 71 24 100 44201 Ozone District Of Columbia District of Columbia 6/14/2008 11-001-0043 0.067ppm 74 24 100 44201 Ozone District Of Columbia District of Columbia 6/14/2008 24-003-0014 0.066ppm 71 24 100 44201 Ozone Maryland Anne Arundel 6/14/2008 24-005-1007 0.064ppm 64 24 100 44201 Ozone Maryland Baltimore 6/14/2008 24-005-3001 0.081 ppm 114 24 100 44201 Ozone Maryland Baltimore 6/14/2008 24-009-0011 0.064ppm 64 24 100 44201 Ozone Maryland Calvert 6/14/2008 24-013-0001 0.057ppm 48 24 100 44201 Ozone Maryland Carroll 6/14/2008 24-017-0010 0.061 ppm 54 24 100 44201 Ozone Maryland Charles 6/14/2008 24-021-0037 0.054ppm 46 24 100 44201 Ozone Maryland Frederick 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 6/14/2008 24-031-3001 0.068ppm 77 24 100 44201 Ozone Maryland Montgomery 6/14/2008 24-033-0030 0.074ppm 97 24 100 44201 Ozone Maryland Prince George's 6/14/2008 24-033-8003 0.067ppm 74 24 100 44201 Ozone Maryland Prince George's 6/14/2008 24-510-0054 0.052ppm 44 24 100 44201 Ozone Maryland Baltimore (City) 6/14/2008 51-013-0020 0.065 ppm 67 24 100 44201 Ozone Virginia Arlington 6/14/2008 51-059-0030 0.058ppm 49 24 100 44201 Ozone Virginia Fairfax 6/14/2008 51-061-0002 0.046ppm 39 24 100 44201 Ozone Virginia Fauquier 6/14/2008 51-107-1005 0.056ppm 47 24 100 44201 Ozone Virginia Loudoun 6/14/2008 51-153-0009 0.054ppm 46 24 100 44201 Ozone Virginia Prince William 6/14/2008 51-179-0001 0.051 ppm 43 24 100 44201 Ozone Virginia Stafford 6/14/2008 51-510-0009 0.055 ppm 47 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

6/21/2008 11-001-0025 0.072ppm 90 24 100 44201 Ozone District Of Columbia District of Columbia 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 24-003-0014 0.073 ppm 93 24 100 44201 Ozone Maryland Anne Arundel 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 24-009-0011 0.068ppm 77 24 100 44201 Ozone Maryland Calvert 6/21/2008 24-013-0001 0.073 ppm 93 24 100 44201 Ozone Maryland Carroll 6/21/2008 24-017-0010 0.066ppm 71 24 100 44201 Ozone Maryland Charles 6/21/2008 24-021-0037 0.073 ppm 93 24 100 44201 Ozone Maryland Frederick 6/21/2008 24-025-1001 ND 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 24-033-8003 0.071 ppm 87 24 100 44201 Ozone Maryland Prince George's 6/21/2008 24-510-0054 0.058ppm 49 24 100 44201 Ozone Maryland Baltimore (City) 6/21/2008 51-013-0020 0.076ppm 101 24 100 44201 Ozone Virginia Arlington 6/21/2008 51-059-0005 0.068ppm 77 24 100 44201 Ozone Virginia Fairfax 6/21/2008 51-059-0018 0.072ppm 90 24 100 44201 Ozone Virginia Fairfax 6/21/2008 51-059-0030 0.068ppm 77 24 100 44201 Ozone Virginia Fairfax 6/21/2008 51-059-5001 0.074ppm 97 24 100 44201 Ozone Virginia Fairfax 6/21/2008 51-061-0002 0.052ppm 44 24 100 44201 Ozone Virginia Fauquier 6/21/2008 51-107-1005 0.07ppm 84 24 100 44201 Ozone Virginia Loudoun 6/21/2008 51-153-0009 0.067ppm 74 24 100 44201 Ozone Virginia Prince William 6/21/2008 51-179-0001 0.057ppm 48 24 100 44201 Ozone Virginia Stafford 6/21/2008 51-510-0009 0.065 ppm 67 24 100 44201 Ozone Virginia Alexandria City

7/3/2008 11-001-0025 0.065 ppm 67 24 100 44201 Ozone District Of Columbia District of Columbia 7/3/2008 11-001-0041 0.069ppm 80 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

7/3/2008 11-001-0043 0.064ppm 64 24 100 44201 Ozone District Of Columbia District of Columbia 7/3/2008 24-003-0014 0.073 ppm 93 24 100 44201 Ozone Maryland Anne Arundel 7/3/2008 24-005-1007 0.072ppm 90 24 100 44201 Ozone Maryland Baltimore 7/3/2008 24-005-3001 0.074ppm 97 24 100 44201 Ozone Maryland Baltimore 7/3/2008 24-009-0011 0.073 ppm 93 24 100 44201 Ozone Maryland Calvert 7/3/2008 24-013-0001 0.065 ppm 67 24 100 44201 Ozone Maryland Carroll 7/3/2008 24-017-0010 0.073 ppm 93 24 100 44201 Ozone Maryland Charles 7/3/2008 24-021-0037 0.066ppm 71 24 100 44201 Ozone Maryland Frederick 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 7/3/2008 24-031-3001 0.072ppm 90 24 100 44201 Ozone Maryland Montgomery 7/3/2008 24-033-0030 0.07ppm 84 24 100 44201 Ozone Maryland Prince George's 7/3/2008 24-033-8003 0.071 ppm 87 24 100 44201 Ozone Maryland Prince George's 7/3/2008 24-510-0054 0.062ppm 58 24 100 44201 Ozone Maryland Baltimore (City) 7/3/2008 51-013-0020 0.068ppm 77 24 100 44201 Ozone Virginia Arlington 7/3/2008 51-059-0030 0.066ppm 71 24 100 44201 Ozone Virginia Fairfax 7/3/2008 51-061-0002 0.058ppm 49 24 100 44201 Ozone Virginia Fauquier 7/3/2008 51-107-1005 0.066ppm 71 24 100 44201 Ozone Virginia Loudoun 7/3/2008 51-153-0009 0.064ppm 64 24 100 44201 Ozone Virginia Prince William 7/3/2008 51-179-0001 0.058ppm 49 24 100 44201 Ozone Virginia Stafford 7/3/2008 51-510-0009 0.063 ppm 61 24 100 44201 Ozone Virginia Alexandria City

7/11/2008 11-001-0025 0.068ppm 77 24 100 44201 Ozone District Of Columbia District of Columbia 7/11/2008 11-001-0041 0.075 ppm 100 24 100 44201 Ozone District Of Columbia District of Columbia 7/11/2008 11-001-0043 0.074ppm 97 24 100 44201 Ozone District Of Columbia District of Columbia 7/11/2008 24-003-0014 0.076ppm 101 24 100 44201 Ozone Maryland Anne Arundel 7/11/2008 24-005-1007 0.071 ppm 87 24 100 44201 Ozone Maryland Baltimore 7/11/2008 24-005-3001 0.084ppm 122 24 100 44201 Ozone Maryland Baltimore 7/11/2008 24-009-0011 0.063 ppm 61 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

7/11/2008 24-013-0001 0.065 ppm 67 24 100 44201 Ozone Maryland Carroll 7/11/2008 24-017-0010 0.064ppm 64 24 100 44201 Ozone Maryland Charles 7/11/2008 24-021-0037 0.066ppm 71 24 100 44201 Ozone Maryland Frederick 7/11/2008 24-025-1001 0.100ppm 161 24 100 44201 Ozone Maryland Harford 7/11/2008 24-025-9001 0.076ppm 101 24 100 44201 Ozone Maryland Harford 7/11/2008 24-031-3001 0.065 ppm 67 24 100 44201 Ozone Maryland Montgomery 7/11/2008 24-033-0030 0.07ppm 84 24 100 44201 Ozone Maryland Prince George's 7/11/2008 24-033-8003 0.067ppm 74 24 100 44201 Ozone Maryland Prince George's 7/11/2008 24-510-0054 0.056ppm 47 24 100 44201 Ozone Maryland Baltimore (City) 7/11/2008 51-013-0020 0.07ppm 84 24 100 44201 Ozone Virginia Arlington 7/11/2008 51-059-0030 0.066ppm 71 24 100 44201 Ozone Virginia Fairfax 7/11/2008 51-061-0002 0.054ppm 46 24 100 44201 Ozone Virginia Fauquier 7/11/2008 51-107-1005 0.061 ppm 54 24 100 44201 Ozone Virginia Loudoun 7/11/2008 51-153-0009 0.057ppm 48 24 100 44201 Ozone Virginia Prince William 7/11/2008 51-179-0001 0.055 ppm 47 24 100 44201 Ozone Virginia Stafford 7/11/2008 51-510-0009 0.061 ppm 54 24 100 44201 Ozone Virginia Alexandria City

7/12/2008 11-001-0025 0.059ppm 50 24 100 44201 Ozone District Of Columbia District of Columbia 7/12/2008 11-001-0041 0.064ppm 64 24 100 44201 Ozone District Of Columbia District of Columbia 7/12/2008 11-001-0043 0.062ppm 58 24 100 44201 Ozone District Of Columbia District of Columbia 7/12/2008 24-003-0014 0.071 ppm 87 24 100 44201 Ozone Maryland Anne Arundel 7/12/2008 24-005-1007 0.075 ppm 100 24 100 44201 Ozone Maryland Baltimore 7/12/2008 24-005-3001 0.07ppm 84 24 100 44201 Ozone Maryland Baltimore 7/12/2008 24-009-0011 0.069ppm 80 24 100 44201 Ozone Maryland Calvert 7/12/2008 24-013-0001 0.073 ppm 93 24 100 44201 Ozone Maryland Carroll 7/12/2008 24-017-0010 0.066ppm 71 24 100 44201 Ozone Maryland Charles 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 7/12/2008 24-025-9001 0.071 ppm 87 24 100 44201 Ozone Maryland Harford 7/12/2008 24-031-3001 0.072ppm 90 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

7/12/2008 24-033-0030 0.069ppm 80 24 100 44201 Ozone Maryland Prince George's 7/12/2008 24-033-8003 0.065 ppm 67 24 100 44201 Ozone Maryland Prince George's 7/12/2008 24-510-0054 0.057ppm 48 24 100 44201 Ozone Maryland Baltimore (City) 7/12/2008 51-013-0020 0.065 ppm 67 24 100 44201 Ozone Virginia Arlington 7/12/2008 51-059-0030 0.062ppm 58 24 100 44201 Ozone Virginia Fairfax 7/12/2008 51-061-0002 0.059ppm 50 24 100 44201 Ozone Virginia Fauquier 7/12/2008 51-107-1005 0.071 ppm 87 24 100 44201 Ozone Virginia Loudoun 7/12/2008 51-153-0009 0.066ppm 71 24 100 44201 Ozone Virginia Prince William 7/12/2008 51-179-0001 0.056ppm 47 24 100 44201 Ozone Virginia Stafford 7/12/2008 51-510-0009 0.06ppm 51 24 100 44201 Ozone Virginia Alexandria City

7/15/2008 11-001-0025 0.07ppm 84 24 100 44201 Ozone District Of Columbia District of Columbia 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 24-005-1007 0.062ppm 58 24 100 44201 Ozone Maryland Baltimore 7/15/2008 24-005-3001 0.071 ppm 87 24 100 44201 Ozone Maryland Baltimore 7/15/2008 24-009-0011 0.071 ppm 87 24 100 44201 Ozone Maryland Calvert 7/15/2008 24-013-0001 0.065 ppm 67 24 100 44201 Ozone Maryland Carroll 7/15/2008 24-017-0010 0.072ppm 90 24 100 44201 Ozone Maryland Charles 7/15/2008 24-021-0037 0.06ppm 51 24 100 44201 Ozone Maryland Frederick 7/15/2008 24-025-1001 0.071 ppm 87 24 100 44201 Ozone Maryland Harford 7/15/2008 24-025-9001 0.061 ppm 54 24 100 44201 Ozone Maryland Harford 7/15/2008 24-031-3001 0.059ppm 50 24 100 44201 Ozone Maryland Montgomery 7/15/2008 24-033-0030 0.064ppm 64 24 100 44201 Ozone Maryland Prince George's 7/15/2008 24-033-8003 0.074ppm 97 24 100 44201 Ozone Maryland Prince George's 7/15/2008 24-510-0054 0.046ppm 39 24 100 44201 Ozone Maryland Baltimore (City) 7/15/2008 51-013-0020 0.081 ppm 114 24 100 44201 Ozone Virginia Arlington 7/15/2008 51-059-0005 0.065 ppm 67 24 100 44201 Ozone Virginia Fairfax 7/15/2008 51-059-0030 0.074ppm 97 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

7/15/2008 51-061-0002 0.051 ppm 43 24 100 44201 Ozone Virginia Fauquier 7/15/2008 51-107-1005 0.068ppm 77 24 100 44201 Ozone Virginia Loudoun 7/15/2008 51-153-0009 0.063 ppm 61 24 100 44201 Ozone Virginia Prince William 7/15/2008 51-179-0001 0.07ppm 84 24 100 44201 Ozone Virginia Stafford 7/15/2008 51-510-0009 0.07ppm 84 24 100 44201 Ozone Virginia Alexandria City

7/16/2008 11-001-0025 0.075 ppm 100 24 100 44201 Ozone District Of Columbia District of Columbia 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 24-009-0011 0.075 ppm 100 24 100 44201 Ozone Maryland Calvert 7/16/2008 24-013-0001 0.071 ppm 87 24 100 44201 Ozone Maryland Carroll 7/16/2008 24-017-0010 0.078ppm 106 24 100 44201 Ozone Maryland Charles 7/16/2008 24-021-0037 0.075 ppm 100 24 100 44201 Ozone Maryland Frederick 7/16/2008 24-025-1001 0.081 ppm 114 24 100 44201 Ozone Maryland Harford 7/16/2008 24-025-9001 0.074ppm 97 24 100 44201 Ozone Maryland Harford 7/16/2008 24-031-3001 0.072ppm 90 24 100 44201 Ozone Maryland Montgomery 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 24-510-0054 0.052ppm 44 24 100 44201 Ozone Maryland Baltimore (City) 7/16/2008 51-013-0020 0.084ppm 122 24 100 44201 Ozone Virginia Arlington 7/16/2008 51-059-0005 0.077 ppm 104 24 100 44201 Ozone Virginia Fairfax 7/16/2008 51-059-0030 0.088ppm 132 24 100 44201 Ozone Virginia Fairfax 7/16/2008 51-061-0002 0.065 ppm 67 24 100 44201 Ozone Virginia Fauquier 7/16/2008 51-153-0009 0.071 ppm 87 24 100 44201 Ozone Virginia Prince William 7/16/2008 51-179-0001 0.085 ppm 124 24 100 44201 Ozone Virginia Stafford 7/16/2008 51-510-0009 0.075 ppm 100 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

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 24-005-1007 0.072ppm 90 24 100 44201 Ozone Maryland Baltimore 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 24-013-0001 0.069ppm 80 24 100 44201 Ozone Maryland Carroll 7/17/2008 24-017-0010 0.089ppm 135 24 100 44201 Ozone Maryland Charles 7/17/2008 24-021-0037 0.074ppm 97 24 100 44201 Ozone Maryland Frederick 7/17/2008 24-025-1001 0.088ppm 132 24 100 44201 Ozone Maryland Harford 7/17/2008 24-025-9001 0.067ppm 74 24 100 44201 Ozone Maryland Harford 7/17/2008 24-031-3001 0.07ppm 84 24 100 44201 Ozone Maryland Montgomery 7/17/2008 24-031-3001 0.07ppm 84 24 100 44201 Ozone Maryland Montgomery 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 24-510-0054 0.059ppm 50 24 100 44201 Ozone Maryland Baltimore (City) 7/17/2008 51-013-0020 0.104ppm 172 24 100 44201 Ozone Virginia Arlington 7/17/2008 51-059-0005 0.079 ppm 109 24 100 44201 Ozone Virginia Fairfax 7/17/2008 51-059-0030 0.095 ppm 150 24 100 44201 Ozone Virginia Fairfax 7/17/2008 51-061-0002 0.063 ppm 61 24 100 44201 Ozone Virginia Fauquier 7/17/2008 51-061-0002 0.063 ppm 61 24 100 44201 Ozone Virginia Fauquier 7/17/2008 51-153-0009 0.075 ppm 100 24 100 44201 Ozone Virginia Prince William 7/17/2008 51-153-0009 0.075 ppm 100 24 100 44201 Ozone Virginia Prince William 7/17/2008 51-179-0001 0.064ppm 64 24 100 44201 Ozone Virginia Stafford 7/17/2008 51-179-0001 0.064ppm 64 24 100 44201 Ozone Virginia Stafford 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 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

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 24-009-0011 0.073 ppm 93 24 100 44201 Ozone Maryland Calvert 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 24-021-0037 0.073 ppm 93 24 100 44201 Ozone Maryland Frederick 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 51-061-0002 0.058ppm 49 24 100 44201 Ozone Virginia Fauquier 7/18/2008 51-153-0009 0.074ppm 97 24 100 44201 Ozone Virginia Prince William 7/18/2008 51-179-0001 0.066ppm 71 24 100 44201 Ozone Virginia Stafford 7/18/2008 51-510-0009 0.077ppm 104 24 100 44201 Ozone Virginia Alexandria City

9/3/2008 11-001-0025 0.075 ppm 100 24 100 44201 Ozone District Of Columbia District of Columbia 9/3/2008 11-001-0041 0.075 ppm 100 24 100 44201 Ozone District Of Columbia District of Columbia 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 24-005-1007 0.053 ppm 45 24 100 44201 Ozone Maryland Baltimore 9/3/2008 24-005-3001 0.073 ppm 93 24 100 44201 Ozone Maryland Baltimore 9/3/2008 24-009-0011 0.087ppm 129 24 100 44201 Ozone Maryland Calvert 9/3/2008 24-013-0001 0.068ppm 77 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

9/3/2008 24-017-0010 0.086ppm 127 24 100 44201 Ozone Maryland Charles 9/3/2008 24-021-0037 0.074ppm 97 24 100 44201 Ozone Maryland Frederick 9/3/2008 24-025-1001 0.062ppm 58 24 100 44201 Ozone Maryland Harford 9/3/2008 24-025-9001 0.055 ppm 47 24 100 44201 Ozone Maryland Harford 9/3/2008 24-031-3001 0.067ppm 74 24 100 44201 Ozone Maryland Montgomery 9/3/2008 24-033-0030 0.063 ppm 61 24 100 44201 Ozone Maryland Prince George's 9/3/2008 24-033-8003 0.079ppm 109 24 100 44201 Ozone Maryland Prince George's 9/3/2008 24-510-0054 0.048ppm 41 24 100 44201 Ozone Maryland Baltimore (City) 9/3/2008 51-013-0020 0.073 ppm 93 24 100 44201 Ozone Virginia Arlington 9/3/2008 51-059-0005 0.066ppm 71 24 100 44201 Ozone Virginia Fairfax 9/3/2008 51-059-0030 0.085 ppm 124 24 100 44201 Ozone Virginia Fairfax 9/3/2008 51-059-1005 0.075 ppm 100 24 100 44201 Ozone Virginia Fairfax 9/3/2008 51-059-5001 0.071 ppm 87 24 100 44201 Ozone Virginia Fairfax 9/3/2008 51-061-0002 0.048ppm 41 18 75 44201 Ozone Virginia Fauquier 9/3/2008 51-153-0009 0.065 ppm 67 24 100 44201 Ozone Virginia Prince William 9/3/2008 51-179-0001 0.054ppm 46 24 100 44201 Ozone Virginia Stafford 9/3/2008 51-510-0009 0.062ppm 58 24 100 44201 Ozone Virginia Alexandria City 9/4/2008 11-001-0025 0.068ppm 77 24 100 44201 Ozone District Of Columbia District of Columbia 9/4/2008 11-001-0041 0.07ppm 84 24 100 44201 Ozone District Of Columbia District of Columbia 9/4/2008 11-001-0043 0.07ppm 84 24 100 44201 Ozone District Of Columbia District of Columbia 9/4/2008 24-003-0014 0.079ppm 109 24 100 44201 Ozone Maryland Anne Arundel 9/4/2008 24-005-1007 0.072ppm 90 24 100 44201 Ozone Maryland Baltimore 9/4/2008 24-005-3001 0.071 ppm 87 24 100 44201 Ozone Maryland Baltimore 9/4/2008 24-009-0011 0.077ppm 104 24 100 44201 Ozone Maryland Calvert 9/4/2008 24-013-0001 0.075 ppm 100 24 100 44201 Ozone Maryland Carroll 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 24-025-9001 0.067ppm 74 24 100 44201 Ozone Maryland Harford 9/4/2008 24-031-3001 0.071 ppm 87 19 79 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

9/4/2008 24-033-0030 0.071 ppm 87 24 100 44201 Ozone Maryland Prince George's 9/4/2008 24-033-8003 0.07ppm 84 24 100 44201 Ozone Maryland Prince George's 9/4/2008 24-510-0054 0.053 ppm 45 24 100 44201 Ozone Maryland Baltimore (City) 9/4/2008 51-013-0020 0.07ppm 84 24 100 44201 Ozone Virginia Arlington 9/4/2008 51-059-0030 0.077ppm 104 24 100 44201 Ozone Virginia Fairfax 9/4/2008 51-061-0002 0.055 ppm 47 24 100 44201 Ozone Virginia Fauquier 9/4/2008 51-107-1005 0.073 ppm 93 24 100 44201 Ozone Virginia Loudoun 9/4/2008 51-153-0009 0.061 ppm 54 24 100 44201 Ozone Virginia Prince William 9/4/2008 51-179-0001 0.069ppm 80 24 100 44201 Ozone Virginia Stafford 9/4/2008 51-510-0009 0.065 ppm 67 24 100 44201 Ozone Virginia Alexandria City

6/25/2009 11-001-0025 0.067ppm 74 24 100 44201 Ozone District Of Columbia District of Columbia 6/25/2009 11-001-0041 0.064ppm 64 24 100 44201 Ozone District Of Columbia District of Columbia 6/25/2009 11-001-0043 0.071 ppm 87 24 100 44201 Ozone District Of Columbia District of Columbia 6/25/2009 24-003-0014 0.071 ppm 87 24 100 44201 Ozone Maryland Anne Arundel 6/25/2009 24-005-1007 0.056ppm 47 24 100 44201 Ozone Maryland Baltimore 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 24-013-0001 0.051 ppm 43 24 100 44201 Ozone Maryland Carroll 6/25/2009 24-017-0010 0.072ppm 90 24 100 44201 Ozone Maryland Charles 6/25/2009 24-021-0037 0.058ppm 49 24 100 44201 Ozone Maryland Frederick 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 6/25/2009 24-031-3001 0.054ppm 46 24 100 44201 Ozone Maryland Montgomery 6/25/2009 24-033-0030 0.051 ppm 43 24 100 44201 Ozone Maryland Prince George's 6/25/2009 24-033-8003 0.071 ppm 87 24 100 44201 Ozone Maryland Prince George's 6/25/2009 24-510-0054 0.07ppm 84 24 100 44201 Ozone Maryland Baltimore (City) 6/25/2009 51-013-0020 0.067ppm 74 24 100 44201 Ozone Virginia Arlington 6/25/2009 51-059-0030 0.062ppm 58 24 100 44201 Ozone Virginia Fairfax 6/25/2009 51-061-0002 0.05 ppm 42 24 100 44201 Ozone Virginia FauquierDate 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

6/25/2009 51-107-1005 0.059ppm 50 24 100 44201 Ozone Virginia Loudoun 6/25/2009 51-153-0009 0.057ppm 48 24 100 44201 Ozone Virginia Prince William 6/25/2009 51-179-0001 0.054ppm 46 24 100 44201 Ozone Virginia Stafford 6/25/2009 51-510-0009 0.056ppm 47 24 100 44201 Ozone Virginia Alexandria City

6/26/2009 11-001-0025 0.074ppm 97 24 100 44201 Ozone District Of Columbia District of Columbia 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 24-003-0014 0.065 ppm 67 24 100 44201 Ozone Maryland Anne Arundel 6/26/2009 24-005-1007 0.059ppm 50 24 100 44201 Ozone Maryland Baltimore 6/26/2009 24-005-3001 0.074ppm 97 24 100 44201 Ozone Maryland Baltimore 6/26/2009 24-009-0011 0.06ppm 51 24 100 44201 Ozone Maryland Calvert 6/26/2009 24-013-0001 0.054ppm 46 24 100 44201 Ozone Maryland Carroll 6/26/2009 24-017-0010 0.055 ppm 47 24 100 44201 Ozone Maryland Charles 6/26/2009 24-021-0037 0.061 ppm 54 24 100 44201 Ozone Maryland Frederick 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 24-031-3001 0.06ppm 51 24 100 44201 Ozone Maryland Montgomery 6/26/2009 24-033-0030 0.073 ppm 93 24 100 44201 Ozone Maryland Prince George's 6/26/2009 24-033-8003 0.062ppm 58 24 100 44201 Ozone Maryland Prince George's 6/26/2009 24-510-0054 0.065 ppm 67 24 100 44201 Ozone Maryland Baltimore (City) 6/26/2009 51-013-0020 0.077ppm 104 24 100 44201 Ozone Virginia Arlington 6/26/2009 51-059-0030 0.071 ppm 87 24 100 44201 Ozone Virginia Fairfax 6/26/2009 51-061-0002 0.04ppm 34 24 100 44201 Ozone Virginia Fauquier 6/26/2009 51-107-1005 0.057ppm 48 24 100 44201 Ozone Virginia Loudoun 6/26/2009 51-153-0009 0.051 ppm 43 24 100 44201 Ozone Virginia Prince William 6/26/2009 51-179-0001 0.053 ppm 45 24 100 44201 Ozone Virginia Stafford 6/26/2009 51-510-0009 0.069ppm 80 24 100 44201 Ozone Virginia Alexandria City

8/16/2009 24-003-0014 0.053 ppm 45 24 100 44201 Ozone Maryland Anne ArundelDate 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

8/16/2009 24-005-1007 0.062ppm 58 24 100 44201 Ozone Maryland Baltimore 8/16/2009 24-005-3001 0.067ppm 74 24 100 44201 Ozone Maryland Baltimore 8/16/2009 24-013-0001 0.057ppm 48 24 100 44201 Ozone Maryland Carroll 8/16/2009 24-025-1001 0.085 ppm 124 24 100 44201 Ozone Maryland Harford 8/16/2009 24-025-9001 0.068ppm 77 24 100 44201 Ozone Maryland Harford 8/16/2009 24-510-0054 0.065 ppm 67 24 100 44201 Ozone Maryland Baltimore (City)

8/17/2009 24-003-0014 0.053 ppm 45 24 100 44201 Ozone Maryland Anne Arundel 8/17/2009 24-005-1007 0.068ppm 77 24 100 44201 Ozone Maryland Baltimore 8/17/2009 24-005-3001 0.062ppm 58 24 100 44201 Ozone Maryland Baltimore 8/17/2009 24-013-0001 0.062ppm 58 24 100 44201 Ozone Maryland Carroll 8/17/2009 24-025-1001 0.067ppm 74 24 100 44201 Ozone Maryland Harford 8/17/2009 24-025-9001 0.066ppm 71 24 100 44201 Ozone Maryland Harford 8/17/2009 24-510-0054 0.06ppm 51 24 100 44201 Ozone Maryland Baltimore (City)

8/18/2009 24-003-0014 0.062ppm 58 24 100 44201 Ozone Maryland Anne Arundel 8/18/2009 24-005-1007 0.058ppm 49 24 100 44201 Ozone Maryland Baltimore 8/18/2009 24-005-3001 0.067ppm 74 24 100 44201 Ozone Maryland Baltimore 8/18/2009 24-013-0001 0.048ppm 41 24 100 44201 Ozone Maryland Carroll 8/18/2009 24-025-1001 0.083 ppm 119 24 100 44201 Ozone Maryland Harford 8/18/2009 24-025-9001 0.064ppm 64 24 100 44201 Ozone Maryland Harford 8/18/2009 24-510-0054 0.063 ppm 61 24 100 44201 Ozone Maryland Baltimore (City)

8/27/2009 11-001-0025 0.073 ppm 93 24 100 44201 Ozone District Of Columbia District of Columbia 8/27/2009 11-001-0041 0.067ppm 74 24 100 44201 Ozone District Of Columbia District of Columbia 8/27/2009 11-001-0043 0.074ppm 97 24 100 44201 Ozone District Of Columbia District of Columbia 8/27/2009 24-003-0014 0.066ppm 71 24 100 44201 Ozone Maryland Anne Arundel 8/27/2009 24-005-1007 0.066ppm 71 24 100 44201 Ozone Maryland Baltimore 8/27/2009 24-005-3001 0.065 ppm 67 24 100 44201 Ozone Maryland Baltimore 8/27/2009 24-009-0011 0.061 ppm 54 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

8/27/2009 24-013-0001 0.056ppm 47 24 100 44201 Ozone Maryland Carroll 8/27/2009 24-017-0010 0.064ppm 64 24 100 44201 Ozone Maryland Charles 8/27/2009 24-021-0037 0.067ppm 74 24 100 44201 Ozone Maryland Frederick 8/27/2009 24-025-1001 0.076ppm 101 24 100 44201 Ozone Maryland Harford 8/27/2009 24-025-9001 0.061 ppm 54 24 100 44201 Ozone Maryland Harford 8/27/2009 24-031-3001 0.061 ppm 54 24 100 44201 Ozone Maryland Montgomery 8/27/2009 24-033-0030 0.07ppm 84 24 100 44201 Ozone Maryland Prince George's 8/27/2009 24-033-8003 0.065 ppm 67 24 100 44201 Ozone Maryland Prince George's 8/28/2009 24-510-0054 0.031 ppm 26 24 100 44201 Ozone Maryland Baltimore (City) 8/27/2009 51-013-0020 0.067ppm 74 24 100 44201 Ozone Virginia Arlington 8/27/2009 51-059-0005 0.064ppm 64 24 100 44201 Ozone Virginia Fairfax 8/27/2009 51-059-0018 0.075 ppm 100 24 100 44201 Ozone Virginia Fairfax 8/27/2009 51-059-0030 0.08ppm 111 24 100 44201 Ozone Virginia Fairfax 8/27/2009 51-059-5001 0.068ppm 77 24 100 44201 Ozone Virginia Fairfax 8/27/2009 51-061-0002 0.049ppm 42 24 100 44201 Ozone Virginia Fauquier 8/27/2009 51-107-1005 0.065 ppm 67 24 100 44201 Ozone Virginia Loudoun 8/27/2009 51-153-0009 0.058ppm 49 24 100 44201 Ozone Virginia Prince William 8/27/2009 51-179-0001 0.069ppm 80 24 100 44201 Ozone Virginia Stafford 8/27/2009 51-510-0009 0.065 ppm 67 24 100 44201 Ozone Virginia Alexandria City

5/27/2010 11-001-0025 0.074ppm 97 24 100 44201 Ozone District Of Columbia District of Columbia 5/27/2010 11-001-0041 0.069ppm 80 24 100 44201 Ozone District Of Columbia District of Columbia 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 5/27/201024-005-1007 0.075 ppm 100 24 100 44201 Ozone Maryland Baltimore 5/27/201024-005-3001 0.079ppm 109 24 100 44201 Ozone Maryland Baltimore 5/27/201024-009-0011 0.071 ppm 87 24 100 44201 Ozone Maryland Calvert 5/27/201024-013-0001 0.067ppm 74 24 100 44201 Ozone Maryland Carroll 5/27/201024-017-0010 0.064ppm 64 24 100 44201 Ozone Maryland Charles 5/27/201024-021-0037 0.065 ppm 67 24 100 44201 Ozone Maryland FrederickDate 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

5/27/201024-025-1001 0.089ppm 135 24 100 44201 Ozone Maryland Harford 5/27/201024-025-9001 0.075 ppm 100 24 100 44201 Ozone Maryland Harford 5/27/201024-031-3001 0.065 ppm 67 24 100 44201 Ozone Maryland Montgomery 5/27/201024-033-0030 0.087ppm 129 24 100 44201 Ozone Maryland Prince George's 5/27/201024-033-8003 0.074ppm 97 24 100 44201 Ozone Maryland Prince George's 5/27/201024-510-0054 0.065 ppm 67 24 100 44201 Ozone Maryland Baltimore (City) 5/27/2010 51-013-0020 0.083 ppm 119 24 100 44201 Ozone Virginia Arlington 5/27/2010 51-059-0030 0.088ppm 132 24 100 44201 Ozone Virginia Fairfax 5/27/2010 51-061-0002 0.054ppm 46 24 100 44201 Ozone Virginia Fauquier 5/27/2010 51-107-1005 0.065 ppm 67 24 100 44201 Ozone Virginia Loudoun 5/27/2010 51-153-0009 0.061 ppm 54 24 100 44201 Ozone Virginia Prince William 5/27/2010 51-179-0001 0.080ppm 111 24 100 44201 Ozone Virginia Stafford 5/27/2010 51-510-0009 0.078ppm 106 24 100 44201 Ozone Virginia Alexandria City

6/2/2010 11-001-0025 0.075 ppm 100 24 100 44201 Ozone District Of Columbia District of Columbia 6/2/2010 11-001-0041 0.064ppm 64 24 100 44201 Ozone District Of Columbia District of Columbia 6/2/2010 11-001-0043 0.078ppm 106 24 100 44201 Ozone District Of Columbia District of Columbia 6/2/201024-003-0014 0.066ppm 71 24 100 44201 Ozone Maryland Anne Arundel 6/2/201024-005-1007 0.069ppm 80 24 100 44201 Ozone Maryland Baltimore 6/2/201024-005-3001 0.071 ppm 87 24 100 44201 Ozone Maryland Baltimore 6/2/201024-009-0011 0.062ppm 58 24 100 44201 Ozone Maryland Calvert 6/2/201024-013-0001 0.063 ppm 61 24 100 44201 Ozone Maryland Carroll 6/2/201024-017-0010 0.063 ppm 61 24 100 44201 Ozone Maryland Charles 6/2/201024-021-0037 0.062ppm 58 24 100 44201 Ozone Maryland Frederick 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 6/2/201024-031-3001 0.073 ppm 93 24 100 44201 Ozone Maryland Montgomery 6/2/201024-033-0030 0.080ppm 111 24 100 44201 Ozone Maryland Prince George's 6/2/201024-033-8003 0.068ppm 77 24 100 44201 Ozone Maryland Prince George's 6/2/201051-013-0020 0.075 ppm 100 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

6/2/201051-059-0030 0.071 ppm 87 24 100 44201 Ozone Virginia Fairfax 6/2/201051-061-0002 0.053 ppm 45 24 100 44201 Ozone Virginia Fauquier 6/2/201051-107-1005 0.064ppm 64 24 100 44201 Ozone Virginia Loudoun 6/2/201051-153-0009 0.063 ppm 61 24 100 44201 Ozone Virginia Prince William 6/2/201051-179-0001 0.063 ppm 61 24 100 44201 Ozone Virginia Stafford 6/2/201051-510-0009 0.069ppm 80 18 75 44201 Ozone Virginia Alexandria City

6/21/2010 11-001-0025 0.064ppm 64 24 100 44201 Ozone District Of Columbia District of Columbia 6/21/2010 11-001-0041 0.069ppm 80 24 100 44201 Ozone District Of Columbia District of Columbia 6/21/2010 11-001-0043 0.069ppm 80 24 100 44201 Ozone District Of Columbia District of Columbia 6/21/201024-003-0014 0.07ppm 84 24 100 44201 Ozone Maryland Anne Arundel 6/21/201024-005-1007 0.055 ppm 47 24 100 44201 Ozone Maryland Baltimore 6/21/201024-009-0011 0.082ppm 116 24 100 44201 Ozone Maryland Calvert 6/21/201024-013-0001 0.058ppm 49 24 100 44201 Ozone Maryland Carroll 6/21/201024-017-0010 0.076ppm 101 24 100 44201 Ozone Maryland Charles 6/21/201024-021-0037 0.064ppm 64 24 100 44201 Ozone Maryland Frederick 6/21/201024-025-1001 0.07ppm 84 24 100 44201 Ozone Maryland Harford 6/21/201024-025-9001 0.065 ppm 67 24 100 44201 Ozone Maryland Harford 6/21/201024-031-3001 0.065 ppm 67 24 100 44201 Ozone Maryland Montgomery 6/21/201024-033-0030 0.064ppm 64 24 100 44201 Ozone Maryland Prince George's 6/21/201024-033-8003 0.077ppm 104 24 100 44201 Ozone Maryland Prince George's 6/21/201024-510-0054 0.045 ppm 38 24 100 44201 Ozone Maryland Baltimore (City) 6/21/2010 51-013-0020 0.066ppm 71 24 100 44201 Ozone Virginia Arlington 6/21/2010 51-059-0018 0.068ppm 77 24 100 44201 Ozone Virginia Fairfax 6/21/2010 51-059-0030 0.070ppm 84 24 100 44201 Ozone Virginia Fairfax 6/21/2010 51-061-0002 0.051 ppm 43 24 100 44201 Ozone Virginia Fauquier 6/21/2010 51-107-1005 0.060ppm 51 24 100 44201 Ozone Virginia Loudoun 6/21/2010 51-153-0009 0.059ppm 50 24 100 44201 Ozone Virginia Prince William 6/21/2010 51-179-0001 0.058ppm 49 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

6/21/2010 51-510-0009 0.062ppm 58 24 100 44201 Ozone Virginia Alexandria City

6/22/2010 11-001-0025 0.072ppm 90 24 100 44201 Ozone District Of Columbia District of Columbia 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 6/22/201024-003-0014 0.068ppm 77 24 100 44201 Ozone Maryland Anne Arundel 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 Baltimore 6/22/201024-009-0011 0.067ppm 74 24 100 44201 Ozone Maryland Calvert 6/22/201024-013-0001 0.073 ppm 93 24 100 44201 Ozone Maryland Carroll 6/22/201024-017-0010 0.067ppm 74 24 100 44201 Ozone Maryland Charles 6/22/201024-021-0037 0.065 ppm 67 24 100 44201 Ozone Maryland Frederick 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 6/22/201024-033-8003 0.071 ppm 87 24 100 44201 Ozone Maryland Prince George's 6/22/201024-510-0054 0.062ppm 58 24 100 44201 Ozone Maryland Baltimore (City) 6/22/2010 51-013-0020 0.079ppm 109 24 100 44201 Ozone Virginia Arlington 6/22/2010 51-059-0030 0.071 ppm 87 24 100 44201 Ozone Virginia Fairfax 6/22/2010 51-061-0002 0.059ppm 50 24 100 44201 Ozone Virginia Fauquier 6/22/2010 51-107-1005 0.066ppm 71 24 100 44201 Ozone Virginia Loudoun 6/22/2010 51-153-0009 0.064ppm 64 24 100 44201 Ozone Virginia Prince William 6/22/2010 51-179-0001 0.061 ppm 54 18 75 44201 Ozone Virginia Stafford 6/22/2010 51-510-0009 0.070ppm 84 24 100 44201 Ozone Virginia Alexandria City

6/23/2010 11-001-0025 0.063 ppm 61 24 100 44201 Ozone District Of Columbia District of Columbia 6/23/2010 11-001-0041 0.068ppm 77 24 100 44201 Ozone District Of Columbia District of Columbia 6/23/2010 11-001-0043 0.067ppm 74 24 100 44201 Ozone District Of Columbia District of Columbia 6/23/201024-003-0014 0.072ppm 90 24 100 44201 Ozone Maryland Anne ArundelDate 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

6/23/201024-005-1007 0.064ppm 64 24 100 44201 Ozone Maryland Baltimore 6/23/201024-005-3001 0.069ppm 80 24 100 44201 Ozone Maryland Baltimore 6/23/201024-009-0011 0.076ppm 101 24 100 44201 Ozone Maryland Calvert 6/23/201024-017-0010 0.073 ppm 93 24 100 44201 Ozone Maryland Charles 6/23/201024-021-0037 0.064ppm 64 24 100 44201 Ozone Maryland Frederick 6/23/201024-025-1001 0.082ppm 116 24 100 44201 Ozone Maryland Harford 6/23/201024-025-9001 0.066ppm 71 24 100 44201 Ozone Maryland Harford 6/23/201024-031-3001 0.069ppm 80 24 100 44201 Ozone Maryland Montgomery 6/23/201024-033-0030 0.068ppm 77 24 100 44201 Ozone Maryland Prince George's 6/23/201024-033-8003 0.073 ppm 93 24 100 44201 Ozone Maryland Prince George's 6/23/201024-510-0054 0.051 ppm 43 24 100 44201 Ozone Maryland Baltimore (City) 6/23/2010 51-013-0020 0.067ppm 74 24 100 44201 Ozone Virginia Arlington 6/23/2010 51-059-0030 0.068ppm 77 24 100 44201 Ozone Virginia Fairfax 6/23/2010 51-061-0002 0.047ppm 40 24 100 44201 Ozone Virginia Fauquier 6/23/2010 51-107-1005 0.063 ppm 61 24 100 44201 Ozone Virginia Loudoun 6/23/2010 51-153-0009 0.058ppm 49 24 100 44201 Ozone Virginia Prince William 6/23/2010 51-179-0001 0.057ppm 48 24 100 44201 Ozone Virginia Stafford 6/23/2010 51-510-0009 0.064ppm 64 18 75 44201 Ozone Virginia Alexandria City

6/24/2010 11-001-0025 0.051 ppm 43 24 100 44201 Ozone District Of Columbia District of Columbia 6/24/2010 11-001-0041 0.056ppm 47 24 100 44201 Ozone District Of Columbia District of Columbia 6/24/2010 11-001-0043 0.053 ppm 45 24 100 44201 Ozone District Of Columbia District of Columbia 6/24/201024-003-0014 0.061 ppm 54 24 100 44201 Ozone Maryland Anne Arundel 6/24/201024-005-1007 0.051 ppm 43 24 100 44201 Ozone Maryland Baltimore 6/24/201024-005-3001 0.053 ppm 45 24 100 44201 Ozone Maryland Baltimore 6/24/201024-009-0011 0.054ppm 46 24 100 44201 Ozone Maryland Calvert 6/24/201024-013-0001 0.055 ppm 47 24 100 44201 Ozone Maryland Carroll 6/24/201024-017-0010 0.053 ppm 45 24 100 44201 Ozone Maryland Charles 6/24/201024-021-0037 0.056ppm 47 24 100 44201 Ozone Maryland Frederick 6/24/201024-025-1001 0.054ppm 46 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

6/24/201024-025-9001 0.053 ppm 45 24 100 44201 Ozone Maryland Harford 6/24/201024-031-3001 0.054ppm 46 24 100 44201 Ozone Maryland Montgomery 6/24/201024-033-0030 0.053 ppm 45 24 100 44201 Ozone Maryland Prince George's 6/24/201024-033-8003 0.061 ppm 54 24 100 44201 Ozone Maryland Prince George's 6/24/2010 51-013-0020 0.052ppm 44 24 100 44201 Ozone Virginia Arlington 6/24/2010 51-059-0018 0.054ppm 46 24 100 44201 Ozone Virginia Fairfax 6/24/2010 51-059-0030 0.053 ppm 45 24 100 44201 Ozone Virginia Fairfax 6/24/2010 51-061-0002 0.037ppm 31 24 100 44201 Ozone Virginia Fauquier 6/24/2010 51-107-1005 0.052ppm 44 24 100 44201 Ozone Virginia Loudoun 6/24/2010 51-153-0009 0.048ppm 41 24 100 44201 Ozone Virginia Prince William 6/24/2010 51-179-0001 0.047ppm 40 24 100 44201 Ozone Virginia Stafford 6/24/2010 51-510-0009 0.050ppm 42 24 100 44201 Ozone Virginia Alexandria City

6/25/2010 11-001-0025 0.064ppm 64 24 100 44201 Ozone District Of Columbia District of Columbia 6/25/2010 11-001-0041 0.070ppm 84 24 100 44201 Ozone District Of Columbia District of Columbia 6/25/2010 11-001-0043 0.071 ppm 87 24 100 44201 Ozone District Of Columbia District of Columbia 6/25/201024-003-0014 0.075 ppm 100 24 100 44201 Ozone Maryland Anne Arundel 6/25/201024-005-1007 0.062ppm 58 24 100 44201 Ozone Maryland Baltimore 6/25/201024-005-3001 0.081 ppm 114 24 100 44201 Ozone Maryland Baltimore 6/25/201024-009-0011 0.067ppm 74 24 100 44201 Ozone Maryland Calvert 6/25/201024-013-0001 0.06ppm 51 24 100 44201 Ozone Maryland Carroll 6/25/201024-017-0010 0.073 ppm 93 24 100 44201 Ozone Maryland Charles 6/25/201024-021-0037 0.065 ppm 67 24 100 44201 Ozone Maryland Frederick 6/25/201024-025-1001 0.087ppm 129 24 100 44201 Ozone Maryland Harford 6/25/201024-025-9001 0.061 ppm 54 24 100 44201 Ozone Maryland Harford 6/25/201024-031-3001 0.067ppm 74 24 100 44201 Ozone Maryland Montgomery 6/25/201024-033-0030 0.069ppm 80 24 100 44201 Ozone Maryland Prince George's 6/25/201024-033-8003 0.080ppm 111 24 100 44201 Ozone Maryland Prince George's 6/25/201024-510-0054 0.058ppm 49 24 100 44201 Ozone Maryland Baltimore (City) 6/25/2010 51-013-0020 0.066ppm 71 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

6/25/2010 51-059-0030 0.071 ppm 87 24 100 44201 Ozone Virginia Fairfax 6/25/2010 51-061-0002 0.051 ppm 43 24 100 44201 Ozone Virginia Fauquier 6/25/2010 51-107-1005 0.062ppm 58 24 100 44201 Ozone Virginia Loudoun 6/25/2010 51-153-0009 0.059ppm 50 24 100 44201 Ozone Virginia Prince William 6/25/2010 51-179-0001 0.060ppm 51 24 100 44201 Ozone Virginia Stafford 6/25/2010 51-510-0009 0.064ppm 64 24 100 44201 Ozone Virginia Alexandria City

6/26/2010 11-001-0025 0.070ppm 84 24 100 44201 Ozone District Of Columbia District of Columbia 6/26/2010 11-001-0041 0.075 ppm 100 24 100 44201 Ozone District Of Columbia District of Columbia 6/26/2010 11-001-0043 0.074ppm 97 24 100 44201 Ozone District Of Columbia District of Columbia 6/26/201024-003-0014 0.065 ppm 67 24 100 44201 Ozone Maryland Anne Arundel 6/26/201024-005-1007 0.075 ppm 100 24 100 44201 Ozone Maryland Baltimore 6/26/201024-005-3001 0.078ppm 106 24 100 44201 Ozone Maryland Baltimore 6/26/201024-009-0011 0.065 ppm 67 24 100 44201 Ozone Maryland Calvert 6/26/201024-013-0001 0.073 ppm 93 24 100 44201 Ozone Maryland Carroll 6/26/201024-017-0010 0.067ppm 74 24 100 44201 Ozone Maryland Charles 6/26/201024-021-0037 0.073 ppm 93 24 100 44201 Ozone Maryland Frederick 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 6/26/201024-031-3001 0.073 ppm 93 24 100 44201 Ozone Maryland Montgomery 6/26/201024-033-0030 0.076ppm 101 24 100 44201 Ozone Maryland Prince George's 6/26/201024-033-8003 0.069ppm 80 24 100 44201 Ozone Maryland Prince George's 6/26/201024-510-0054 0.065 ppm 67 24 100 44201 Ozone Maryland Baltimore (City) 6/26/2010 51-013-0020 0.072ppm 90 24 100 44201 Ozone Virginia Arlington 6/26/2010 51-059-0030 0.067ppm 74 24 100 44201 Ozone Virginia Fairfax 6/26/2010 51-061-0002 0.054ppm 46 24 100 44201 Ozone Virginia Fauquier 6/26/2010 51-107-1005 0.069ppm 80 24 100 44201 Ozone Virginia Loudoun 6/26/2010 51-153-0009 0.066ppm 71 24 100 44201 Ozone Virginia Prince William 6/26/2010 51-179-0001 0.064ppm 64 24 100 44201 Ozone Virginia Stafford 6/26/2010 51-510-0009 0.066ppm 71 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

6/27/2010 11-001-0025 0.057ppm 48 24 100 44201 Ozone District Of Columbia District of Columbia 6/27/2010 11-001-0041 0.064ppm 64 24 100 44201 Ozone District Of Columbia District of Columbia 6/27/2010 11-001-0043 0.061 ppm 54 24 100 44201 Ozone District Of Columbia District of Columbia 6/27/201024-003-0014 0.065 ppm 67 24 100 44201 Ozone Maryland Anne Arundel 6/27/201024-005-1007 0.058ppm 49 24 100 44201 Ozone Maryland Baltimore 6/27/201024-005-3001 0.062ppm 58 24 100 44201 Ozone Maryland Baltimore 6/27/201024-009-0011 0.061 ppm 54 24 100 44201 Ozone Maryland Calvert 6/27/201024-013-0001 0.058ppm 49 24 100 44201 Ozone Maryland Carroll 6/27/201024-017-0010 0.057ppm 48 24 100 44201 Ozone Maryland Charles 6/27/201024-021-0037 0.059ppm 50 24 100 44201 Ozone Maryland Frederick 6/27/201024-025-1001 0.079ppm 109 24 100 44201 Ozone Maryland Harford 6/27/201024-025-9001 0.06ppm 51 24 100 44201 Ozone Maryland Harford 6/27/201024-031-3001 0.061 ppm 54 24 100 44201 Ozone Maryland Montgomery 6/27/201024-033-0030 0.061 ppm 54 24 100 44201 Ozone Maryland Prince George's 6/27/201024-033-8003 0.065 ppm 67 24 100 44201 Ozone Maryland Prince George's 6/27/201024-510-0054 0.046ppm 39 24 100 44201 Ozone Maryland Baltimore (City) 6/27/2010 51-013-0020 0.060ppm 51 24 100 44201 Ozone Virginia Arlington 6/27/2010 51-059-0018 0.057ppm 48 24 100 44201 Ozone Virginia Fairfax 6/27/2010 51-059-0030 0.058ppm 49 24 100 44201 Ozone Virginia Fairfax 6/27/2010 51-061-0002 0.046ppm 39 24 100 44201 Ozone Virginia Fauquier 6/27/2010 51-107-1005 0.055 ppm 47 24 100 44201 Ozone Virginia Loudoun 6/27/2010 51-153-0009 0.053 ppm 45 24 100 44201 Ozone Virginia Prince William 6/27/2010 51-179-0001 0.053 ppm 45 24 100 44201 Ozone Virginia Stafford 6/27/2010 51-510-0009 0.058ppm 49 24 100 44201 Ozone Virginia Alexandria City

7/3/2010 11-001-0025 0.073 ppm 93 24 100 44201 Ozone District Of Columbia District of Columbia 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 7/3/201024-003-0014 0.064ppm 64 24 100 44201 Ozone Maryland Anne ArundelDate 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

7/3/201024-005-1007 0.059ppm 50 24 100 44201 Ozone Maryland Baltimore 7/3/201024-005-3001 0.07ppm 84 24 100 44201 Ozone Maryland Baltimore 7/3/201024-009-0011 0.061 ppm 54 24 100 44201 Ozone Maryland Calvert 7/3/201024-013-0001 0.061 ppm 54 24 100 44201 Ozone Maryland Carroll 7/3/201024-017-0010 0.061 ppm 54 24 100 44201 Ozone Maryland Charles 7/3/201024-021-0037 0.058ppm 49 24 100 44201 Ozone Maryland Frederick 7/3/201024-025-1001 0.08ppm 111 24 100 44201 Ozone Maryland Harford 7/3/201024-025-9001 0.067ppm 74 24 100 44201 Ozone Maryland Harford 7/3/201024-031-3001 0.068ppm 77 24 100 44201 Ozone Maryland Montgomery 7/3/201024-033-0030 0.082ppm 116 24 100 44201 Ozone Maryland Prince George's 7/3/201024-033-8003 0.063 ppm 61 24 100 44201 Ozone Maryland Prince George's 7/3/201024-510-0054 0.056ppm 47 24 100 44201 Ozone Maryland Baltimore (City) 7/3/201051-013-0020 0.069ppm 80 24 100 44201 Ozone Virginia Arlington 7/3/201051-059-0030 0.065 ppm 67 24 100 44201 Ozone Virginia Fairfax 7/3/201051-061-0002 0.054ppm 46 24 100 44201 Ozone Virginia Fauquier 7/3/201051-107-1005 0.062ppm 58 24 100 44201 Ozone Virginia Loudoun 7/3/201051-153-0009 0.059ppm 50 24 100 44201 Ozone Virginia Prince William 7/3/201051-179-0001 0.062ppm 58 24 100 44201 Ozone Virginia Stafford 7/3/201051-510-0009 0.062ppm 58 24 100 44201 Ozone Virginia Alexandria City

7/4/2010 11-001-0025 0.069ppm 80 24 100 44201 Ozone District Of Columbia District of Columbia 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 7/4/201024-003-0014 0.073 ppm 93 24 100 44201 Ozone Maryland Anne Arundel 7/4/201024-005-1007 0.067ppm 74 24 100 44201 Ozone Maryland Baltimore 7/4/201024-005-3001 0.08ppm 111 24 100 44201 Ozone Maryland Baltimore 7/4/201024-009-0011 0.067ppm 74 24 100 44201 Ozone Maryland Calvert 7/4/201024-013-0001 0.07ppm 84 24 100 44201 Ozone Maryland Carroll 7/4/201024-017-0010 0.063 ppm 61 24 100 44201 Ozone Maryland Charles 7/4/201024-021-0037 0.071 ppm 87 24 100 44201 Ozone Maryland FrederickDate 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

7/4/201024-025-1001 0.09ppm 137 24 100 44201 Ozone Maryland Harford 7/4/201024-025-9001 0.074ppm 97 24 100 44201 Ozone Maryland Harford 7/4/201024-031-3001 0.072ppm 90 24 100 44201 Ozone Maryland Montgomery 7/4/201024-033-0030 0.076ppm 101 24 100 44201 Ozone Maryland Prince George's 7/4/201024-033-8003 0.071 ppm 87 24 100 44201 Ozone Maryland Prince George's 7/4/201024-510-0054 0.064ppm 64 24 100 44201 Ozone Maryland Baltimore (City) 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 Fairfax 7/4/201051-061-0002 0.059ppm 50 24 100 44201 Ozone Virginia Fauquier 7/4/201051-107-1005 0.062ppm 58 24 100 44201 Ozone Virginia Loudoun 7/4/201051-153-0009 0.059ppm 50 24 100 44201 Ozone Virginia Prince William 7/4/201051-179-0001 0.066ppm 71 24 100 44201 Ozone Virginia Stafford 7/4/201051-510-0009 0.074ppm 97 24 100 44201 Ozone Virginia Alexandria City

7/5/2010 11-001-0025 0.065 ppm 67 24 100 44201 Ozone District Of Columbia District of Columbia 7/5/2010 11-001-0041 0.073 ppm 93 24 100 44201 Ozone District Of Columbia District of Columbia 7/5/2010 11-001-0043 0.071 ppm 87 24 100 44201 Ozone District Of Columbia District of Columbia 7/5/201024-003-0014 0.077ppm 104 24 100 44201 Ozone Maryland Anne Arundel 7/5/201024-005-1007 0.073 ppm 93 24 100 44201 Ozone Maryland Baltimore 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 7/5/201024-013-0001 0.073 ppm 93 24 100 44201 Ozone Maryland Carroll 7/5/201024-017-0010 0.080ppm 111 24 100 44201 Ozone Maryland Charles 7/5/201024-021-0037 0.068ppm 77 24 100 44201 Ozone Maryland Frederick 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 7/5/201024-031-3001 0.069ppm 80 24 100 44201 Ozone Maryland Montgomery 7/5/201024-033-0030 0.069ppm 80 24 100 44201 Ozone Maryland Prince George's 7/5/201024-033-8003 0.080ppm 111 24 100 44201 Ozone Maryland Prince George's 7/5/201024-510-0054 0.06ppm 51 24 100 44201 Ozone Maryland Baltimore (City)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

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

7/5/201051-013-0020 0.071 ppm 87 24 100 44201 Ozone Virginia Arlington 7/5/201051-059-0030 0.072ppm 90 24 100 44201 Ozone Virginia Fairfax 7/5/201051-061-0002 0.058ppm 49 24 100 44201 Ozone Virginia Fauquier 7/5/201051-107-1005 0.064ppm 64 24 100 44201 Ozone Virginia Loudoun 7/5/201051-153-0009 0.062ppm 58 24 100 44201 Ozone Virginia Prince William 7/5/201051-179-0001 0.069ppm 80 24 100 44201 Ozone Virginia Stafford 7/5/201051-510-0009 0.069ppm 80 24 100 44201 Ozone Virginia Alexandria City

7/6/2010 11-001-0025 0.073 ppm 93 24 100 44201 Ozone District Of Columbia District of Columbia 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 7/6/201024-005-1007 0.072ppm 90 24 100 44201 Ozone Maryland Baltimore 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 7/6/201024-025-9001 0.07ppm 84 24 100 44201 Ozone Maryland Harford 7/6/201024-031-3001 0.072ppm 90 24 100 44201 Ozone Maryland Montgomery 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 7/6/201024-510-0054 0.064ppm 64 24 100 44201 Ozone Maryland Baltimore (City) 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 7/6/201051-061-0002 0.060ppm 51 24 100 44201 Ozone Virginia Fauquier 7/6/201051-107-1005 0.071 ppm 87 24 100 44201 Ozone Virginia Loudoun 7/6/201051-153-0009 0.060ppm 51 24 100 44201 Ozone Virginia Prince William 7/6/201051-179-0001 0.068ppm 77 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

7/6/201051-510-0009 0.070ppm 84 24 100 44201 Ozone Virginia Alexandria City

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 7/7/201024-005-1007 0.073 ppm 93 24 100 44201 Ozone Maryland Baltimore 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 Charles 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 7/7/201024-025-9001 0.072ppm 90 24 100 44201 Ozone Maryland Harford 7/7/201024-031-3001 0.074ppm 97 24 100 44201 Ozone Maryland Montgomery 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 7/7/201024-510-0054 0.062ppm 58 24 100 44201 Ozone Maryland Baltimore (City) 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 7/7/201051-061-0002 0.072ppm 90 24 100 44201 Ozone Virginia Fauquier 7/7/201051-107-1005 0.084ppm 122 24 100 44201 Ozone Virginia Loudoun 7/7/201051-153-0009 0.075 ppm 100 24 100 44201 Ozone Virginia Prince William 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

7/8/2010 11-001-0025 0.056ppm 47 24 100 44201 Ozone District Of Columbia District of Columbia 7/8/2010 11-001-0041 0.056ppm 47 24 100 44201 Ozone District Of Columbia District of Columbia 7/8/2010 11-001-0043 0.058ppm 49 24 100 44201 Ozone District Of Columbia District of Columbia 7/8/201024-003-0014 0.053 ppm 45 24 100 44201 Ozone Maryland Anne ArundelDate 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

7/8/201024-005-1007 0.061 ppm 54 24 100 44201 Ozone Maryland Baltimore 7/8/201024-005-3001 0.053 ppm 45 24 100 44201 Ozone Maryland Baltimore 7/8/201024-009-0011 0.045 ppm 38 24 100 44201 Ozone Maryland Calvert 7/8/201024-013-0001 0.083 ppm 119 24 100 44201 Ozone Maryland Carroll 7/8/201024-017-0010 0.044ppm 37 24 100 44201 Ozone Maryland Charles 7/8/201024-021-0037 0.093 ppm 145 24 100 44201 Ozone Maryland Frederick 7/8/201024-025-1001 0.057ppm 48 24 100 44201 Ozone Maryland Harford 7/8/201024-025-9001 0.05 ppm 42 24 100 44201 Ozone Maryland Harford 7/8/201024-031-3001 0.073 ppm 93 24 100 44201 Ozone Maryland Montgomery 7/8/201024-033-0030 0.061 ppm 54 24 100 44201 Ozone Maryland Prince George's 7/8/201051-013-0020 0.060ppm 51 24 100 44201 Ozone Virginia Arlington 7/8/201051-059-0030 0.058ppm 49 24 100 44201 Ozone Virginia Fairfax 7/8/201051-061-0002 0.065 ppm 67 24 100 44201 Ozone Virginia Fauquier 7/8/201051-107-1005 0.092ppm 142 24 100 44201 Ozone Virginia Loudoun 7/8/201051-153-0009 0.093 ppm 145 24 100 44201 Ozone Virginia Prince William 7/8/201051-179-0001 0.058ppm 49 24 100 44201 Ozone Virginia Stafford 7/8/201051-510-0009 0.055 ppm 47 24 100 44201 Ozone Virginia Alexandria City

7/23/2010 11-001-0025 0.035 ppm 30 24 100 44201 Ozone District Of Columbia District of Columbia 7/23/2010 11-001-0041 0.075 ppm 100 24 100 44201 Ozone District Of Columbia District of Columbia 7/23/2010 11-001-0043 0.070ppm 84 24 100 44201 Ozone District Of Columbia District of Columbia 7/23/201024-003-0014 0.082ppm 116 24 100 44201 Ozone Maryland Anne Arundel 7/23/201024-005-1007 0.071 ppm 87 24 100 44201 Ozone Maryland Baltimore 7/23/201024-005-3001 0.082ppm 116 24 100 44201 Ozone Maryland Baltimore 7/23/201024-009-0011 0.058ppm 49 24 100 44201 Ozone Maryland Calvert 7/23/201024-013-0001 0.063 ppm 61 24 100 44201 Ozone Maryland Carroll 7/23/201024-017-0010 0.061 ppm 54 24 100 44201 Ozone Maryland Charles 7/23/201024-021-0037 0.059ppm 50 24 100 44201 Ozone Maryland Frederick 7/23/201024-025-1001 0.101 ppm 164 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

7/23/201024-025-9001 0.086ppm 127 24 100 44201 Ozone Maryland Harford 7/23/201024-031-3001 0.072ppm 90 24 100 44201 Ozone Maryland Montgomery 7/23/201024-033-0030 0.074ppm 97 24 100 44201 Ozone Maryland Prince George's 7/23/201024-033-8003 0.075 ppm 100 24 100 44201 Ozone Maryland Prince George's 7/23/2010 51-013-0020 0.065 ppm 67 24 100 44201 Ozone Virginia Arlington 7/23/2010 51-059-0030 0.065 ppm 67 24 100 44201 Ozone Virginia Fairfax 7/23/2010 51-061-0002 0.050ppm 42 24 100 44201 Ozone Virginia Fauquier 7/23/2010 51-107-1005 0.058ppm 49 24 100 44201 Ozone Virginia Loudoun 7/23/2010 51-153-0009 0.055 ppm 47 24 100 44201 Ozone Virginia Prince William 7/23/2010 51-179-0001 0.051 ppm 43 24 100 44201 Ozone Virginia Stafford 7/23/2010 51-510-0009 0.066ppm 71 24 100 44201 Ozone Virginia Alexandria City

7/31/2010 11-001-0025 0.066ppm 71 24 100 44201 Ozone District Of Columbia District of Columbia 7/31/2010 11-001-0041 0.070ppm 84 24 100 44201 Ozone District Of Columbia District of Columbia 7/31/2010 11-001-0043 0.069ppm 80 24 100 44201 Ozone District Of Columbia District of Columbia 7/31/201024-003-0014 0.067ppm 74 24 100 44201 Ozone Maryland Anne Arundel 7/31/201024-005-1007 0.076ppm 101 24 100 44201 Ozone Maryland Baltimore 7/31/201024-005-3001 0.075 ppm 100 24 100 44201 Ozone Maryland Baltimore 7/31/201024-009-0011 0.062ppm 58 24 100 44201 Ozone Maryland Calvert 7/31/201024-013-0001 0.066ppm 71 24 100 44201 Ozone Maryland Carroll 7/31/201024-017-0010 0.065 ppm 67 24 100 44201 Ozone Maryland Charles 7/31/201024-021-0037 0.064ppm 64 24 100 44201 Ozone Maryland Frederick 7/31/201024-025-1001 0.078ppm 106 24 100 44201 Ozone Maryland Harford 7/31/201024-025-9001 0.06ppm 51 24 100 44201 Ozone Maryland Harford 7/31/201024-031-3001 0.062ppm 58 24 100 44201 Ozone Maryland Montgomery 7/31/201024-033-0030 0.073 ppm 93 24 100 44201 Ozone Maryland Prince George's 7/31/201024-033-8003 0.066ppm 71 24 100 44201 Ozone Maryland Prince George's 7/31/201024-510-0054 0.07ppm 84 24 100 44201 Ozone Maryland Baltimore (City) 7/31/2010 51-013-0020 0.069ppm 80 24 100 44201 Ozone Virginia Arlington 7/31/2010 51-059-0030 0.064ppm 64 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

7/31/2010 51-061-0002 0.056ppm 47 24 100 44201 Ozone Virginia Fauquier 7/31/2010 51-107-1005 0.061 ppm 54 24 100 44201 Ozone Virginia Loudoun 7/31/2010 51-153-0009 0.059ppm 50 24 100 44201 Ozone Virginia Prince William 7/31/2010 51-179-0001 0.065 ppm 67 24 100 44201 Ozone Virginia Stafford 7/31/2010 51-510-0009 0.065 ppm 67 24 100 44201 Ozone Virginia Alexandria City

8/9/2010 11-001-0025 0.072ppm 90 24 100 44201 Ozone District Of Columbia District of Columbia 8/9/2010 11-001-0041 0.070ppm 84 24 100 44201 Ozone District Of Columbia District of Columbia 8/9/2010 11-001-0043 0.066ppm 71 24 100 44201 Ozone District Of Columbia District of Columbia 8/9/201024-003-0014 0.065 ppm 67 24 100 44201 Ozone Maryland Anne Arundel 8/9/201024-005-1007 0.076ppm 101 24 100 44201 Ozone Maryland Baltimore 8/9/201024-005-3001 0.065 ppm 67 24 100 44201 Ozone Maryland Baltimore 8/9/201024-009-0011 0.060ppm 51 24 100 44201 Ozone Maryland Calvert 8/9/201024-013-0001 0.072ppm 90 24 100 44201 Ozone Maryland Carroll 8/9/201024-017-0010 0.051 ppm 43 18 75 44201 Ozone Maryland Charles 8/9/201024-021-0037 0.071 ppm 87 24 100 44201 Ozone Maryland Frederick 8/9/201024-025-1001 0.076ppm 101 24 100 44201 Ozone Maryland Harford 8/9/201024-025-9001 0.067ppm 74 24 100 44201 Ozone Maryland Harford 8/9/201024-031-3001 0.070ppm 84 24 100 44201 Ozone Maryland Montgomery 8/9/201024-033-0030 0.079ppm 109 24 100 44201 Ozone Maryland Prince George's 8/9/201024-033-8003 0.059ppm 50 24 100 44201 Ozone Maryland Prince George's 8/9/201024-510-0054 0.065 ppm 67 24 100 44201 Ozone Maryland Baltimore (City) 8/9/201051-013-0020 0.068ppm 77 24 100 44201 Ozone Virginia Arlington 8/9/201051-059-0030 0.065 ppm 67 24 100 44201 Ozone Virginia Fairfax 8/9/201051-061-0002 0.053 ppm 45 24 100 44201 Ozone Virginia Fauquier 8/9/201051-107-1005 0.065 ppm 67 24 100 44201 Ozone Virginia Loudoun 8/9/201051-153-0009 0.060ppm 51 24 100 44201 Ozone Virginia Prince William 8/9/201051-179-0001 0.058ppm 49 24 100 44201 Ozone Virginia Stafford 8/9/201051-510-0009 0.062ppm 58 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

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 0.11 ppm 187 24 100 44201 Ozone Maryland Harford 8/10/201024-025-9001 0.075 ppm 100 24 100 44201 Ozone Maryland Harford 8/10/201024-031-3001 0.072ppm 90 24 100 44201 Ozone Maryland Montgomery 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 0.1 ppm 161 24 100 44201 Ozone Maryland Baltimore (City) 8/10/2010 51-013-0020 0.088ppm 132 17 71 44201 Ozone Virginia Arlington 8/10/2010 51-059-0030 0.082ppm 116 24 100 44201 Ozone Virginia Fairfax 8/10/2010 51-061-0002 0.059ppm 50 24 100 44201 Ozone Virginia Fauquier 8/10/2010 51-107-1005 0.072ppm 90 24 100 44201 Ozone Virginia Loudoun 8/10/2010 51-153-0009 0.066ppm 71 24 100 44201 Ozone Virginia Prince William 8/10/2010 51-179-0001 0.070ppm 84 24 100 44201 Ozone Virginia Stafford 8/10/2010 51-510-0009 0.081 ppm 114 24 100 44201 Ozone Virginia Alexandria City 8/10/2010 51-510-0009 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 Columbia 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 8/11/201024-005-1007 0.071 ppm 87 24 100 44201 Ozone Maryland Baltimore 8/11/201024-005-3001 0.071 ppm 87 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

8/11/201024-009-0011 0.097ppm 154 24 100 44201 Ozone Maryland Calvert 8/11/201024-013-0001 0.071 ppm 87 24 100 44201 Ozone Maryland Carroll 8/11/201024-017-0010 0.093 ppm 145 24 100 44201 Ozone Maryland Charles 8/11/201024-021-0037 0.071 ppm 87 24 100 44201 Ozone Maryland Frederick 8/11/201024-025-1001 0.072ppm 90 24 100 44201 Ozone Maryland Harford 8/11/201024-025-9001 0.06ppm 51 24 100 44201 Ozone Maryland Harford 8/11/201024-031-3001 0.069ppm 80 24 100 44201 Ozone Maryland Montgomery 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 8/11/201024-510-0054 0.065 ppm 67 18 75 44201 Ozone Maryland Baltimore (City) 8/11/2010 51-013-0020 0.085 ppm 124 24 100 44201 Ozone Virginia Arlington 8/11/2010 51-059-0030 0.089ppm 135 24 100 44201 Ozone Virginia Fairfax 8/11/2010 51-061-0002 0.057ppm 48 24 100 44201 Ozone Virginia Fauquier 8/11/2010 51-107-1005 0.072ppm 90 24 100 44201 Ozone Virginia Loudoun 8/11/2010 51-153-0009 0.065 ppm 67 24 100 44201 Ozone Virginia Prince William 8/11/2010 51-179-0001 0.072ppm 90 24 100 44201 Ozone Virginia Stafford 8/11/2010 51-510-0009 0.082ppm 116 24 100 44201 Ozone Virginia Alexandria City 8/11/2010 51-510-0009 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 8/17/201024-005-1007 0.058ppm 49 24 100 44201 Ozone Maryland Baltimore 8/17/201024-005-3001 0.075 ppm 100 24 100 44201 Ozone Maryland Baltimore 8/17/201024-009-0011 0.064ppm 64 24 100 44201 Ozone Maryland Calvert 8/17/201024-013-0001 0.065 ppm 67 24 100 44201 Ozone Maryland Carroll 8/17/201024-017-0010 0.064ppm 64 24 100 44201 Ozone Maryland Charles 8/17/201024-021-0037 0.072ppm 90 24 100 44201 Ozone Maryland FrederickDate 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

8/17/201024-025-1001 0.066ppm 71 24 100 44201 Ozone Maryland Harford 8/17/201024-025-9001 0.053 ppm 45 24 100 44201 Ozone Maryland Harford 8/17/201024-031-3001 0.062ppm 58 24 100 44201 Ozone Maryland Montgomery 8/17/201024-033-0030 0.070ppm 84 24 100 44201 Ozone Maryland Prince George's 8/17/201024-033-8003 0.071 ppm 87 24 100 44201 Ozone Maryland Prince George's 8/17/201024-510-0054 0.059ppm 50 24 100 44201 Ozone Maryland Baltimore (City) 8/17/2010 51-013-0020 0.089ppm 135 24 100 44201 Ozone Virginia Arlington 8/17/2010 51-059-0030 0.089ppm 135 24 100 44201 Ozone Virginia Fairfax 8/17/2010 51-061-0002 0.069ppm 80 24 100 44201 Ozone Virginia Fauquier 8/17/2010 51-107-1005 0.072ppm 90 24 100 44201 Ozone Virginia Loudoun 8/17/2010 51-153-0009 0.064ppm 64 24 100 44201 Ozone Virginia Prince William 8/17/2010 51-179-0001 0.078ppm 106 24 100 44201 Ozone Virginia Stafford 8/17/2010 51-510-0009 0.085 ppm 124 24 100 44201 Ozone Virginia Alexandria City

8/18/2010 11-001-0025 0.050ppm 42 24 100 44201 Ozone District Of Columbia District of Columbia 8/18/2010 11-001-0041 0.046ppm 39 24 100 44201 Ozone District Of Columbia District of Columbia 8/18/2010 11-001-0043 0.050ppm 42 24 100 44201 Ozone District Of Columbia District of Columbia 8/18/201024-003-0014 0.051 ppm 43 24 100 44201 Ozone Maryland Anne Arundel 8/18/201024-005-1007 0.044ppm 37 24 100 44201 Ozone Maryland Baltimore 8/18/201024-005-3001 0.047ppm 40 24 100 44201 Ozone Maryland Baltimore 8/18/201024-009-0011 0.044ppm 37 24 100 44201 Ozone Maryland Calvert 8/18/201024-013-0001 0.045 ppm 38 24 100 44201 Ozone Maryland Carroll 8/18/201024-017-0010 0.040ppm 34 24 100 44201 Ozone Maryland Charles 8/18/201024-021-0037 0.045 ppm 38 24 100 44201 Ozone Maryland Frederick 8/18/201024-025-1001 0.052ppm 44 24 100 44201 Ozone Maryland Harford 8/18/201024-025-9001 0.04ppm 34 24 100 44201 Ozone Maryland Harford 8/18/201024-031-3001 0.042ppm 36 24 100 44201 Ozone Maryland Montgomery 8/18/201024-033-0030 0.051 ppm 43 24 100 44201 Ozone Maryland Prince George's 8/18/201024-033-8003 0.044ppm 37 24 100 44201 Ozone Maryland Prince George's 8/18/201024-510-0054 0.039ppm 33 24 100 44201 Ozone Maryland Baltimore (City)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

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern Virginia, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

8/18/2010 51-013-0020 0.044ppm 37 24 100 44201 Ozone Virginia Arlington 8/18/2010 51-059-0030 0.044ppm 37 24 100 44201 Ozone Virginia Fairfax 8/18/2010 51-061-0002 0.036ppm 31 24 100 44201 Ozone Virginia Fauquier 8/18/2010 51-107-1005 0.044ppm 37 18 75 44201 Ozone Virginia Loudoun 8/18/2010 51-153-0009 0.043 ppm 36 24 100 44201 Ozone Virginia Prince William 8/18/2010 51-179-0001 0.044ppm 37 24 100 44201 Ozone Virginia Stafford

8/19/2010 11-001-0025 0.069ppm 80 24 100 44201 Ozone District Of Columbia District of Columbia 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 8/19/201024-003-0014 0.074ppm 97 24 100 44201 Ozone Maryland Anne Arundel 8/19/201024-005-1007 0.065 ppm 67 24 100 44201 Ozone Maryland Baltimore 8/19/201024-005-3001 0.087ppm 129 24 100 44201 Ozone Maryland Baltimore 8/19/201024-009-0011 0.068ppm 77 24 100 44201 Ozone Maryland Calvert 8/19/201024-013-0001 0.063 ppm 61 24 100 44201 Ozone Maryland Carroll 8/19/201024-017-0010 0.063 ppm 61 24 100 44201 Ozone Maryland Charles 8/19/201024-021-0037 0.061 ppm 54 24 100 44201 Ozone Maryland Frederick 8/19/201024-025-1001 0.093 ppm 145 24 100 44201 Ozone Maryland Harford 8/19/201024-025-9001 0.072ppm 90 24 100 44201 Ozone Maryland Harford 8/19/201024-031-3001 0.067ppm 74 24 100 44201 Ozone Maryland Montgomery 8/19/201024-033-0030 0.071 ppm 87 24 100 44201 Ozone Maryland Prince George's 8/19/201024-033-8003 0.071 ppm 87 24 100 44201 Ozone Maryland Prince George's 8/19/201024-510-0054 0.075 ppm 100 24 100 44201 Ozone Maryland Baltimore (City) 8/19/2010 51-013-0020 0.075 ppm 100 24 100 44201 Ozone Virginia Arlington 8/19/2010 51-059-0030 0.078ppm 106 24 100 44201 Ozone Virginia Fairfax 8/19/2010 51-061-0002 0.050ppm 42 24 100 44201 Ozone Virginia Fauquier 8/19/2010 51-107-1005 0.057ppm 48 24 100 44201 Ozone Virginia Loudoun 8/19/2010 51-153-0009 0.054ppm 46 24 100 44201 Ozone Virginia Prince William 8/19/2010 51-179-0001 0.061 ppm 54 24 100 44201 Ozone Virginia Stafford 8/19/2010 51-510-0009 0.077ppm 104 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

8/20/2010 11-001-0025 0.074ppm 97 24 100 44201 Ozone District Of Columbia District of Columbia 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 Columbia 8/20/201024-003-0014 0.084ppm 122 24 100 44201 Ozone Maryland Anne Arundel 8/20/201024-005-1007 0.065 ppm 67 24 100 44201 Ozone Maryland Baltimore 8/20/201024-005-3001 0.076ppm 101 24 100 44201 Ozone Maryland Baltimore 8/20/201024-009-0011 0.066ppm 71 24 100 44201 Ozone Maryland Calvert 8/20/201024-013-0001 0.072ppm 90 24 100 44201 Ozone Maryland Carroll 8/20/201024-017-0010 0.071 ppm 87 24 100 44201 Ozone Maryland Charles 8/20/201024-021-0037 0.072ppm 90 24 100 44201 Ozone Maryland Frederick 8/20/201024-025-1001 0.072ppm 90 24 100 44201 Ozone Maryland Harford 8/20/201024-025-9001 0.058ppm 49 24 100 44201 Ozone Maryland Harford 8/20/201024-031-3001 0.071 ppm 87 24 100 44201 Ozone Maryland Montgomery 8/20/201024-033-0030 0.067ppm 74 24 100 44201 Ozone Maryland Prince George's 8/20/201024-033-8003 0.077ppm 104 24 100 44201 Ozone Maryland Prince George's 8/20/201024-510-0054 0.062ppm 58 24 100 44201 Ozone Maryland Baltimore (City) 8/20/2010 51-013-0020 0.077ppm 104 24 100 44201 Ozone Virginia Arlington 8/20/2010 51-059-0030 0.080ppm 111 24 100 44201 Ozone Virginia Fairfax 8/20/2010 51-061-0002 0.059ppm 50 24 100 44201 Ozone Virginia Fauquier 8/20/2010 51-107-1005 0.064ppm 64 24 100 44201 Ozone Virginia Loudoun 8/20/2010 51-153-0009 0.060ppm 51 24 100 44201 Ozone Virginia Prince William 8/20/2010 51-179-0001 0.076ppm 101 24 100 44201 Ozone Virginia Stafford 8/20/2010 51-510-0009 0.080ppm 111 24 100 44201 Ozone Virginia Alexandria City

8/26/2010 11-001-0043 0.054ppm 46 24 100 44201 Ozone District Of Columbia District of Columbia 8/26/201024-003-0014 0.056ppm 47 24 100 44201 Ozone Maryland Anne Arundel 8/26/201024-005-1007 0.046ppm 39 24 100 44201 Ozone Maryland Baltimore 8/26/201024-009-0011 0.062ppm 58 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

8/26/201024-013-0001 0.049ppm 42 24 100 44201 Ozone Maryland Carroll 8/26/201024-017-0010 0.059ppm 50 24 100 44201 Ozone Maryland Charles 8/26/201024-021-0037 0.052ppm 44 24 100 44201 Ozone Maryland Frederick 8/26/201024-025-1001 0.052ppm 44 24 100 44201 Ozone Maryland Harford 8/26/201024-025-9001 0.041 ppm 35 24 100 44201 Ozone Maryland Harford 8/26/201024-031-3001 0.052ppm 44 24 100 44201 Ozone Maryland Montgomery 8/26/201024-033-0030 0.052ppm 44 24 100 44201 Ozone Maryland Prince George's 8/26/201024-033-8003 0.057ppm 48 24 100 44201 Ozone Maryland Prince George's 8/26/201024-510-0054 0.046ppm 39 24 100 44201 Ozone Maryland Baltimore (City) 8/26/2010 51-013-0020 0.055 ppm 47 24 100 44201 Ozone Virginia Arlington 8/26/2010 51-061-0002 0.045 ppm 38 24 100 44201 Ozone Virginia Fauquier 8/26/2010 51-107-1005 0.056ppm 47 24 100 44201 Ozone Virginia Loudoun 8/26/2010 51-153-0009 0.052ppm 44 24 100 44201 Ozone Virginia Prince William 8/26/2010 51-179-0001 0.054ppm 46 18 75 44201 Ozone Virginia Stafford 8/26/2010 51-510-0009 0.051 ppm 43 24 100 44201 Ozone Virginia Alexandria City 8/27/2010 11-001-0043 0.059ppm 50 24 100 44201 Ozone District Of Columbia District of Columbia 8/27/201024-003-0014 0.056ppm 47 24 100 44201 Ozone Maryland Anne Arundel 8/27/201024-005-1007 0.05 ppm 42 24 100 44201 Ozone Maryland Baltimore 8/27/201024-009-0011 0.045 ppm 38 24 100 44201 Ozone Maryland Calvert 8/27/201024-013-0001 0.055 ppm 47 24 100 44201 Ozone Maryland Carroll 8/27/201024-017-0010 0.049ppm 42 24 100 44201 Ozone Maryland Charles 8/27/201024-021-0037 0.053 ppm 45 24 100 44201 Ozone Maryland Frederick 8/27/201024-025-1001 0.06ppm 51 24 100 44201 Ozone Maryland Harford 8/27/201024-025-9001 0.043 ppm 36 24 100 44201 Ozone Maryland Harford 8/27/201024-031-3001 0.050ppm 42 24 100 44201 Ozone Maryland Montgomery 8/27/201024-033-0030 0.052ppm 44 24 100 44201 Ozone Maryland Prince George's 8/27/201024-033-8003 0.052ppm 44 24 100 44201 Ozone Maryland Prince George's 8/27/201024-510-0054 0.05 ppm 42 24 100 44201 Ozone Maryland Baltimore (City) 8/27/2010 51-013-0020 0.058ppm 49 24 100 44201 Ozone Virginia Arlington 8/27/2010 51-013-0020 0.058ppm 49 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

8/27/2010 51-061-0002 0.053 ppm 45 24 100 44201 Ozone Virginia Fauquier 8/27/2010 51-107-1005 0.056ppm 47 24 100 44201 Ozone Virginia Loudoun 8/27/2010 51-153-0009 0.056ppm 47 24 100 44201 Ozone Virginia Prince William 8/27/2010 51-179-0001 0.054ppm 46 24 100 44201 Ozone Virginia Stafford 8/27/2010 51-510-0009 0.059ppm 50 24 100 44201 Ozone Virginia Alexandria City 8/28/2010 11-001-0043 0.069ppm 80 24 100 44201 Ozone District Of Columbia District of Columbia 8/28/201024-003-0014 0.067ppm 74 24 100 44201 Ozone Maryland Anne Arundel 8/28/201024-005-1007 0.067ppm 74 24 100 44201 Ozone Maryland Baltimore 8/28/201024-009-0011 0.057ppm 48 24 100 44201 Ozone Maryland Calvert 8/28/201024-013-0001 0.062ppm 58 24 100 44201 Ozone Maryland Carroll 8/28/201024-017-0010 0.057ppm 48 24 100 44201 Ozone Maryland Charles 8/28/201024-021-0037 0.073 ppm 93 24 100 44201 Ozone Maryland Frederick 8/28/201024-025-1001 0.075 ppm 100 24 100 44201 Ozone Maryland Harford 8/28/201024-025-9001 0.051 ppm 43 24 100 44201 Ozone Maryland Harford 8/28/201024-031-3001 0.062ppm 58 24 100 44201 Ozone Maryland Montgomery 8/28/201024-033-0030 0.073 ppm 93 24 100 44201 Ozone Maryland Prince George's 8/28/201024-033-8003 0.061 ppm 54 24 100 44201 Ozone Maryland Prince George's 8/28/201024-510-0054 0.071 ppm 87 24 100 44201 Ozone Maryland Baltimore (City) 8/28/2010 51-013-0020 0.076ppm 101 24 100 44201 Ozone Virginia Arlington 8/28/2010 51-059-0030 0.075 ppm 100 24 100 44201 Ozone Virginia Fairfax 8/28/2010 51-061-0002 0.054ppm 46 24 100 44201 Ozone Virginia Fauquier 8/28/2010 51-107-1005 0.067ppm 74 24 100 44201 Ozone Virginia Loudoun 8/28/2010 51-153-0009 0.064ppm 64 24 100 44201 Ozone Virginia Prince William 8/28/2010 51-179-0001 0.057ppm 48 24 100 44201 Ozone Virginia Stafford 8/28/2010 51-510-0009 0.075 ppm 100 24 100 44201 Ozone Virginia Alexandria City

8/29/2010 11-001-0041 0.080ppm 111 24 100 44201 Ozone District Of Columbia District of Columbia 8/29/2010 11-001-0043 0.069ppm 80 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 8/29/201024-005-1007 0.063 ppm 61 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

8/29/201024-009-0011 0.060ppm 51 24 100 44201 Ozone Maryland Calvert 8/29/201024-013-0001 0.063 ppm 61 24 100 44201 Ozone Maryland Carroll 8/29/201024-017-0010 0.057ppm 48 24 100 44201 Ozone Maryland Charles 8/29/201024-021-0037 0.065 ppm 67 24 100 44201 Ozone Maryland Frederick 8/29/201024-025-1001 0.096ppm 151 24 100 44201 Ozone Maryland Harford 8/29/201024-025-9001 0.066ppm 71 24 100 44201 Ozone Maryland Harford 8/29/201024-031-3001 0.062ppm 58 24 100 44201 Ozone Maryland Montgomery 8/29/201024-033-0030 0.068ppm 77 24 100 44201 Ozone Maryland Prince George's 8/29/201024-033-8003 0.072ppm 90 24 100 44201 Ozone Maryland Prince George's 8/29/201024-510-0054 0.068ppm 77 24 100 44201 Ozone Maryland Baltimore (City) 8/29/2010 51-013-0020 0.073 ppm 93 24 100 44201 Ozone Virginia Arlington 8/29/2010 51-059-0030 0.073 ppm 93 24 100 44201 Ozone Virginia Fairfax 8/29/2010 51-061-0002 0.051 ppm 43 24 100 44201 Ozone Virginia Fauquier 8/29/2010 51-107-1005 0.059ppm 50 24 100 44201 Ozone Virginia Loudoun 8/29/2010 51-153-0009 0.053 ppm 45 24 100 44201 Ozone Virginia Prince William 8/29/2010 51-179-0001 0.059ppm 50 24 100 44201 Ozone Virginia Stafford 8/29/2010 51-510-0009 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 8/30/201024-005-1007 0.074ppm 97 24 100 44201 Ozone Maryland Baltimore 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 8/30/201024-013-0001 0.069ppm 80 24 100 44201 Ozone Maryland Carroll 8/30/201024-017-0010 0.087ppm 129 24 100 44201 Ozone Maryland Charles 8/30/201024-021-0037 0.069ppm 80 24 100 44201 Ozone Maryland Frederick 8/30/201024-025-1001 0.076ppm 101 24 100 44201 Ozone Maryland Harford 8/30/201024-025-9001 0.063 ppm 61 24 100 44201 Ozone Maryland Harford 8/30/201024-031-3001 0.072ppm 90 24 100 44201 Ozone Maryland Montgomery 8/30/201024-033-0030 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

8/30/201024-033-8003 0.084ppm 122 24 100 44201 Ozone Maryland Prince George's 8/30/201024-510-0054 0.074ppm 97 24 100 44201 Ozone Maryland Baltimore (City) 8/30/2010 51-013-0020 0.085 ppm 124 24 100 44201 Ozone Virginia Arlington 8/30/2010 51-059-0030 0.091 ppm 140 24 100 44201 Ozone Virginia Fairfax 8/30/2010 51-061-0002 0.071 ppm 87 24 100 44201 Ozone Virginia Fauquier 8/30/2010 51-153-0009 0.079ppm 109 24 100 44201 Ozone Virginia Prince William 8/30/2010 51-179-0001 0.086ppm 127 24 100 44201 Ozone Virginia Stafford 8/30/2010 51-510-0009 0.081 ppm 114 24 100 44201 Ozone Virginia Alexandria City

8/29/2010 51-107-1005 0.059ppm 50 24 100 44201 Ozone Virginia Loudoun 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 Columbia 8/31/2010 11-001-0043 0.088ppm 132 24 100 44201 Ozone District Of Columbia District of Columbia 8/31/201024-003-0014 0.072ppm 90 24 100 44201 Ozone Maryland Anne Arundel 8/31/201024-005-1007 0.069ppm 80 24 100 44201 Ozone Maryland Baltimore 8/31/201024-005-3001 0.08ppm 111 24 100 44201 Ozone Maryland Baltimore 8/31/201024-009-0011 0.064ppm 64 24 100 44201 Ozone Maryland Calvert 8/31/201024-013-0001 0.069ppm 80 24 100 44201 Ozone Maryland Carroll 8/31/201024-017-0010 0.073 ppm 93 24 100 44201 Ozone Maryland Charles 8/31/201024-021-0037 0.075 ppm 100 24 100 44201 Ozone Maryland Frederick 8/31/201024-025-1001 0.09ppm 137 24 100 44201 Ozone Maryland Harford 8/31/201024-025-9001 0.065 ppm 67 24 100 44201 Ozone Maryland Harford 8/31/201024-031-3001 0.077ppm 104 24 100 44201 Ozone Maryland Montgomery 8/31/201024-033-0030 0.069ppm 80 24 100 44201 Ozone Maryland Prince George's 8/31/201024-033-8003 0.067ppm 74 24 100 44201 Ozone Maryland Prince George's 8/31/201024-510-0054 0.073 ppm 93 24 100 44201 Ozone Maryland Baltimore (City) 8/31/2010 51-013-0020 0.087ppm 129 19 79 44201 Ozone Virginia Arlington 8/31/2010 51-059-0030 0.086ppm 127 24 100 44201 Ozone Virginia Fairfax 8/31/2010 51-061-0002 0.065 ppm 67 24 100 44201 Ozone Virginia Fauquier 8/31/2010 51-153-0009 0.073 ppm 93 24 100 44201 Ozone Virginia Prince WilliamDate 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

8/31/2010 51-179-0001 0.073 ppm 93 24 100 44201 Ozone Virginia Stafford 8/31/2010 51-510-0009 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 9/1/201024-003-0014 0.07ppm 84 24 100 44201 Ozone Maryland Anne Arundel 9/1/201024-005-1007 0.075 ppm 100 24 100 44201 Ozone Maryland Baltimore 9/1/201024-005-3001 0.078ppm 106 24 100 44201 Ozone Maryland Baltimore 9/1/201024-009-0011 0.072ppm 90 24 100 44201 Ozone Maryland Calvert 9/1/201024-013-0001 0.075 ppm 100 24 100 44201 Ozone Maryland Carroll 9/1/201024-017-0010 0.066ppm 71 24 100 44201 Ozone Maryland Charles 9/1/201024-021-0037 0.074ppm 97 24 100 44201 Ozone Maryland Frederick 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 9/1/201024-033-8003 0.063 ppm 61 24 100 44201 Ozone Maryland Prince George's 9/1/201024-510-0054 0.077ppm 104 24 100 44201 Ozone Maryland Baltimore (City) 9/1/201051-013-0020 0.073 ppm 93 24 100 44201 Ozone Virginia Arlington 9/1/201051-059-0030 0.073 ppm 93 24 100 44201 Ozone Virginia Fairfax 9/1/201051-061-0002 0.056ppm 47 24 100 44201 Ozone Virginia Fauquier 9/1/201051-107-1005 0.075 ppm 100 24 100 44201 Ozone Virginia Loudoun 9/1/201051-153-0009 0.065 ppm 67 24 100 44201 Ozone Virginia Prince William 9/1/201051-179-0001 0.064ppm 64 24 100 44201 Ozone Virginia Stafford 9/1/201051-510-0009 0.066ppm 71 24 100 44201 Ozone Virginia Alexandria City

9/2/2010 11-001-0043 0.073 ppm 93 24 100 44201 Ozone District Of Columbia District of Columbia 9/2/201024-003-0014 0.064ppm 64 24 100 44201 Ozone Maryland Anne Arundel 9/2/201024-005-1007 0.092ppm 142 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

9/2/201024-005-3001 0.071 ppm 87 24 100 44201 Ozone Maryland Baltimore 9/2/201024-009-0011 0.059ppm 50 24 100 44201 Ozone Maryland Calvert 9/2/201024-013-0001 0.084ppm 122 24 100 44201 Ozone Maryland Carroll 9/2/201024-017-0010 0.060ppm 51 24 100 44201 Ozone Maryland Charles 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 9/2/201024-025-9001 0.067ppm 74 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 9/2/201024-033-8003 0.065 ppm 67 24 100 44201 Ozone Maryland Prince George's 9/2/201024-510-0054 0.066ppm 71 24 100 44201 Ozone Maryland Baltimore (City) 9/2/201051-013-0020 0.067ppm 74 24 100 44201 Ozone Virginia Arlington 9/2/201051-059-0030 0.069ppm 80 24 100 44201 Ozone Virginia Fairfax 9/2/201051-061-0002 0.061 ppm 54 24 100 44201 Ozone Virginia Fauquier 9/2/201051-153-0009 0.070ppm 84 24 100 44201 Ozone Virginia Prince William 9/2/201051-179-0001 0.065 ppm 67 24 100 44201 Ozone Virginia Stafford 9/2/201051-510-0009 0.066ppm 71 24 100 44201 Ozone Virginia Alexandria City

9/23/2010 11-001-0025 0.064ppm 64 24 100 44201 Ozone District Of Columbia District of Columbia 9/23/2010 11-001-0041 0.072ppm 90 24 100 44201 Ozone District Of Columbia District of Columbia 9/23/2010 11-001-0043 0.073 ppm 93 24 100 44201 Ozone District Of Columbia District of Columbia 9/23/201024-003-0014 0.061 ppm 54 24 100 44201 Ozone Maryland Anne Arundel 9/23/201024-005-1007 0.064ppm 64 24 100 44201 Ozone Maryland Baltimore 9/23/201024-005-3001 0.061 ppm 54 24 100 44201 Ozone Maryland Baltimore 9/23/201024-009-0011 0.063 ppm 61 24 100 44201 Ozone Maryland Calvert 9/23/201024-013-0001 0.075 ppm 100 24 100 44201 Ozone Maryland Carroll 9/23/201024-017-0010 0.066ppm 71 24 100 44201 Ozone Maryland Charles 9/23/201024-021-0037 0.076ppm 101 24 100 44201 Ozone Maryland Frederick 9/23/201024-025-1001 0.062ppm 58 24 100 44201 Ozone Maryland Harford 9/23/201024-025-9001 0.06ppm 51 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

9/23/201024-031-3001 0.059ppm 50 24 100 44201 Ozone Maryland Montgomery 9/23/201024-033-0030 0.062ppm 58 24 100 44201 Ozone Maryland Prince George's 9/23/201024-033-8003 0.060ppm 51 24 100 44201 Ozone Maryland Prince George's 9/23/2010 51-013-0020 0.071 ppm 87 24 100 44201 Ozone Virginia Arlington 9/23/2010 51-059-0030 0.080ppm 111 24 100 44201 Ozone Virginia Fairfax 9/23/2010 51-061-0002 0.066ppm 71 24 100 44201 Ozone Virginia Fauquier 9/23/2010 51-107-1005 0.070ppm 84 24 100 44201 Ozone Virginia Loudoun 9/23/2010 51-153-0009 0.065 ppm 67 24 100 44201 Ozone Virginia Prince William 9/23/2010 51-179-0001 0.069ppm 80 24 100 44201 Ozone Virginia Stafford 9/23/2010 51-510-0009 0.069ppm 80 24 100 44201 Ozone Virginia Alexandria City 9/24/2010 11-001-0025 0.069ppm 80 24 100 44201 Ozone District Of Columbia District of Columbia 9/24/2010 11-001-0041 0.069ppm 80 24 100 44201 Ozone District Of Columbia District of Columbia 9/24/2010 11-001-0043 0.067ppm 74 24 100 44201 Ozone District Of Columbia District of Columbia 9/24/201024-003-0014 0.074ppm 97 24 100 44201 Ozone Maryland Anne Arundel 9/24/201024-005-1007 0.073 ppm 93 24 100 44201 Ozone Maryland Baltimore 9/24/201024-005-3001 0.075 ppm 100 24 100 44201 Ozone Maryland Baltimore 9/24/201024-009-0011 0.071 ppm 87 24 100 44201 Ozone Maryland Calvert 9/24/201024-013-0001 0.072ppm 90 24 100 44201 Ozone Maryland Carroll 9/24/201024-017-0010 0.069ppm 80 24 100 44201 Ozone Maryland Charles 9/24/201024-021-0037 0.064ppm 64 24 100 44201 Ozone Maryland Frederick 9/24/201024-025-1001 0.077ppm 104 18 75 44201 Ozone Maryland Harford 9/24/201024-025-9001 0.077ppm 104 24 100 44201 Ozone Maryland Harford 9/24/201024-031-3001 0.071 ppm 87 24 100 44201 Ozone Maryland Montgomery 9/24/201024-033-0030 0.073 ppm 93 24 100 44201 Ozone Maryland Prince George's 9/24/201024-033-8003 0.067ppm 74 24 100 44201 Ozone Maryland Prince George's 9/24/201024-510-0054 0.065 ppm 67 19 79 44201 Ozone Maryland Baltimore (City) 9/24/2010 51-013-0020 0.070ppm 84 24 100 44201 Ozone Virginia Arlington 9/24/2010 51-059-0030 0.069ppm 80 24 100 44201 Ozone Virginia Fairfax 9/24/2010 51-061-0002 0.064ppm 64 24 100 44201 Ozone Virginia Fauquier 9/24/2010 51-107-1005 0.065 ppm 67 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, DCTABLE A2-2: Air Quality Data – Monitor Exceedance days By Episode for 2006 through 2010

9/24/2010 51-153-0009 0.063 ppm 61 24 100 44201 Ozone Virginia Prince William 9/24/2010 51-179-0001 0.065 ppm 67 24 100 44201 Ozone Virginia Stafford 9/24/2010 51-510-0009 0.069ppm 80 18 75 44201 Ozone Virginia Alexandria City