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

COUNT PERCENT

COMPLETE STATE COUNTY 7/9/2007 24-025-1001 0.113 ppm 195 24 100Maryland Harford 8/10/2010 24-025-1001 0.110ppm 187 24 100Maryland Harford 6/25/2009 24-025-1001 0.109 ppm 185 24 100Maryland Harford 5/30/2006 24-025-1001 0.103 ppm 169 24 100Maryland Harford 7/18/2008 24-025-1001 0.102ppm 166 24 100Maryland Harford 7/23/2010 24-025-1001 0.101 ppm 164 24 100Maryland Harford 7/18/2006 24-025-1001 0.100ppm 161 24 100Maryland Harford 7/11/2008 24-025-1001 0.100ppm 161 24 100Maryland Harford 6/8/2007 24-025-1001 0.099 ppm 159 24 100Maryland Harford 7/5/2010 24-025-1001 0.097ppm 154 24 100Maryland Harford 8/29/2010 24-025-1001 0.096ppm 151 24 100Maryland Harford 6/21/2006 24-025-1001 0.095 ppm 150 24 100Maryland Harford 7/17/2006 24-025-1001 0.095 ppm 150 24 100Maryland Harford 6/22/2006 24-025-1001 0.094ppm 147 24 100Maryland Harford 6/14/2008 24-025-1001 0.093 ppm 145 24 100Maryland Harford 8/19/2010 24-025-1001 0.093 ppm 145 24 100Maryland Harford 7/6/2010 24-025-1001 0.092ppm 142 24 100Maryland Harford 6/26/2009 24-025-1001 0.091 ppm 140 24 100Maryland Harford 7/8/2007 24-025-1001 0.091 ppm 140 24 100Maryland Harford 8/15/2007 24-025-1001 0.090ppm 137 24 100Maryland Harford 7/4/2010 24-025-1001 0.090ppm 137 24 100Maryland Harford 8/31/2010 24-025-1001 0.090ppm 137 24 100Maryland Harford 9/1/2010 24-025-1001 0.090ppm 137 24 100Maryland Harford 7/3/2008 24-025-1001 0.089 ppm 135 24 100Maryland Harford 5/30/2007 24-025-1001 0.089 ppm 135 24 100Maryland Harford 6/18/2006 24-025-1001 0.089 ppm 135 24 100Maryland Harford 8/7/2006 24-025-1001 0.089 ppm 135 24 100Maryland Harford 5/27/2010 24-025-1001 0.089 ppm 135 24 100Maryland Harford 6/7/2008 24-025-1001 0.088 ppm 132 24 100Maryland Harford 6/18/2007 24-025-1001 0.088 ppm 132 24 100Maryland Harford 7/17/2008 24-025-1001 0.088 ppm 132 24 100Maryland Harford 7/7/2010 24-025-1001 0.088 ppm 132 24 100Maryland Harford 8/4/2007 24-025-1001 0.087ppm 129 24 100Maryland Harford 7/11/2006 24-025-1001 0.087ppm 129 24 100Maryland Harford 8/12/2007 24-025-1001 0.087ppm 129 24 100Maryland Harford 8/22/2006 24-025-1001 0.087ppm 129 24 100Maryland Harford 6/2/2010 24-025-1001 0.087ppm 129 24 100Maryland Harford 6/22/2010 24-025-1001 0.087ppm 129 24 100Maryland Harford 6/25/2010 24-025-1001 0.087ppm 129 24 100Maryland Harford 6/26/2010 24-025-1001 0.087ppm 129 24 100Maryland Harford 4/18/2008 24-025-1001 0.086ppm 127 24 100Maryland Harford 

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern TABLE A2-4: Air Quality Data – Monitor Exceedance days for Edegewood 2006 through 20105/31/2007 24-025-1001 0.086ppm 127 24 100Maryland Harford

8/30/2007 24-025-1001 0.086ppm 127 24 100Maryland Harford 7/16/2010 24-025-1001 0.086ppm 127 18 75 Maryland Harford 7/17/2010 24-025-1001 0.086ppm 127 24 100Maryland Harford 8/16/2009 24-025-1001 0.085 ppm 124 24 100Maryland Harford 6/13/2008 24-025-1001 0.085 ppm 124 24 100Maryland Harford 7/29/2008 24-025-1001 0.085 ppm 124 24 100Maryland Harford 8/25/2006 24-025-1001 0.085 ppm 124 24 100Maryland Harford 8/6/2007 24-025-1001 0.085 ppm 124 24 100Maryland Harford 8/1/2006 24-025-1001 0.084ppm 122 24 100Maryland Harford 8/17/2007 24-025-1001 0.084ppm 122 24 100Maryland Harford 9/26/2007 24-025-1001 0.084ppm 122 24 100Maryland Harford 8/18/2009 24-025-1001 0.083 ppm 119 24 100Maryland Harford 7/3/2006 24-025-1001 0.083 ppm 119 24 100Maryland Harford 6/19/2007 24-025-1001 0.083 ppm 119 24 100Maryland Harford 7/15/2009 24-025-1001 0.082ppm 116 24 100Maryland Harford 4/19/2008 24-025-1001 0.082ppm 116 24 100Maryland Harford 8/7/2007 24-025-1001 0.082ppm 116 24 100Maryland Harford 6/23/2010 24-025-1001 0.082ppm 116 24 100Maryland Harford 9/2/2010 24-025-1001 0.082ppm 116 24 100Maryland Harford 7/16/2009 24-025-1001 0.081 ppm 114 24 100Maryland Harford 7/16/2008 24-025-1001 0.081 ppm 114 24 100Maryland Harford 7/28/2008 24-025-1001 0.081 ppm 114 24 100Maryland Harford 7/21/2006 24-025-1001 0.081 ppm 114 24 100Maryland Harford 7/27/2006 24-025-1001 0.081 ppm 114 24 100Maryland Harford 8/2/2007 24-025-1001 0.081 ppm 114 24 100Maryland Harford 8/25/2007 24-025-1001 0.081 ppm 114 24 100Maryland Harford 9/4/2008 24-025-1001 0.08 ppm 111 24 100Maryland Harford 8/24/2006 24-025-1001 0.08 ppm 111 24 100Maryland Harford 6/1/2007 24-025-1001 0.08 ppm 111 24 100Maryland Harford 7/3/2010 24-025-1001 0.08 ppm 111 24 100Maryland Harford 6/12/2008 24-025-1001 0.079 ppm 109 24 100Maryland Harford 7/12/2008 24-025-1001 0.079 ppm 109 24 100Maryland Harford 6/1/2006 24-025-1001 0.079 ppm 109 24 100Maryland Harford 6/29/2006 24-025-1001 0.079 ppm 109 24 100Maryland Harford 6/27/2010 24-025-1001 0.079 ppm 109 24 100Maryland Harford 4/26/2009 24-025-1001 0.078 ppm 106 24 100Maryland Harford 6/27/2007 24-025-1001 0.078 ppm 106 24 100Maryland Harford 7/14/2007 24-025-1001 0.078 ppm 106 24 100Maryland Harford 8/3/2007 24-025-1001 0.078 ppm 106 24 100Maryland Harford 7/31/2010 24-025-1001 0.078 ppm 106 24 100Maryland Harford 7/13/2009 24-025-1001 0.077ppm 104 24 100Maryland Harford 5/29/2006 24-025-1001 0.077ppm 104 24 100Maryland Harford 7/19/2006 24-025-1001 0.077ppm 104 24 100Maryland Harford 7/24/2006 24-025-1001 0.077ppm 104 24 100Maryland Harford 5/27/2007 24-025-1001 0.077ppm 104 24 100Maryland Harford9/5/2007 24-025-1001 0.077ppm 104 24 100Maryland Harford

5/5/2010 24-025-1001 0.077ppm 104 16 67 Maryland Harford 9/24/2010 24-025-1001 0.077ppm 104 18 75 Maryland Harford 8/27/2009 24-025-1001 0.076ppm 101 24 100Maryland Harford 7/29/2006 24-025-1001 0.076ppm 101 24 100Maryland Harford 7/28/2007 24-025-1001 0.076ppm 101 24 100Maryland Harford 5/21/2010 24-025-1001 0.076ppm 101 24 100Maryland Harford 8/9/2010 24-025-1001 0.076ppm 101 24 100Maryland Harford 8/30/2010 24-025-1001 0.076ppm 101 24 100Maryland Harford

Mean 0.085802083 Standard Deviation 0.00806633 Mode 0.087 Median 0.085



## 1. Bottom Quintile 0.076-0.078 ppm 19 2. Lower Quintile 0.079 to 0.082 ppm 16 3. Middle Quintile 0.082 to 0.087 ppm 21.000 4. Upper Quintile 0.087 to 0.090 ppm 21.000 Group Number Number of values in Group

19 Color Key:

5. Top Quintile Ozone concentration range

0.091 ppm or more

## APPENDIX 2 to Technical Support Document -- Area Designations for the Washington-Baltimore-Northern TABLE A2-4: Air Quality Data – Monitor Exceedance days for Edegewood 2006 through 2010