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 24 100 Maryland Harford

8/10/2010 24-025-1001 0.110 ppm 187 24 100 Maryland Harford

6/25/2009 24-025-1001 0.109 ppm 185 24 100 Maryland Harford

5/30/2006 24-025-1001 0.103 ppm 169 24 100 Maryland Harford

7/18/2008 24-025-1001 0.102 ppm 166 24 100 Maryland Harford

7/23/2010 24-025-1001 0.101 ppm 164 24 100 Maryland Harford

7/18/2006 24-025-1001 0.100 ppm 161 24 100 Maryland Harford

7/11/2008 24-025-1001 0.100 ppm 161 24 100 Maryland Harford

6/8/2007 24-025-1001 0.099 ppm 159 24 100 Maryland Harford

7/5/2010 24-025-1001 0.097 ppm 154 24 100 Maryland Harford

8/29/2010 24-025-1001 0.096 ppm 151 24 100 Maryland Harford

6/21/2006 24-025-1001 0.095 ppm 150 24 100 Maryland Harford

7/17/2006 24-025-1001 0.095 ppm 150 24 100 Maryland Harford

6/22/2006 24-025-1001 0.094 ppm 147 24 100 Maryland Harford

6/14/2008 24-025-1001 0.093 ppm 145 24 100 Maryland Harford

8/19/2010 24-025-1001 0.093 ppm 145 24 100 Maryland Harford

7/6/2010 24-025-1001 0.092 ppm 142 24 100 Maryland Harford

6/26/2009 24-025-1001 0.091 ppm 140 24 100 Maryland Harford

7/8/2007 24-025-1001 0.091 ppm 140 24 100 Maryland Harford

8/15/2007 24-025-1001 0.090 ppm 137 24 100 Maryland Harford

7/4/2010 24-025-1001 0.090 ppm 137 24 100 Maryland Harford

8/31/2010 24-025-1001 0.090 ppm 137 24 100 Maryland Harford

9/1/2010 24-025-1001 0.090 ppm 137 24 100 Maryland Harford

7/3/2008 24-025-1001 0.089 ppm 135 24 100 Maryland Harford

5/30/2007 24-025-1001 0.089 ppm 135 24 100 Maryland Harford

6/18/2006 24-025-1001 0.089 ppm 135 24 100 Maryland Harford

8/7/2006 24-025-1001 0.089 ppm 135 24 100 Maryland Harford

5/27/2010 24-025-1001 0.089 ppm 135 24 100 Maryland Harford

6/7/2008 24-025-1001 0.088 ppm 132 24 100 Maryland Harford

6/18/2007 24-025-1001 0.088 ppm 132 24 100 Maryland Harford

7/17/2008 24-025-1001 0.088 ppm 132 24 100 Maryland Harford

7/7/2010 24-025-1001 0.088 ppm 132 24 100 Maryland Harford

8/4/2007 24-025-1001 0.087 ppm 129 24 100 Maryland Harford

7/11/2006 24-025-1001 0.087 ppm 129 24 100 Maryland Harford

8/12/2007 24-025-1001 0.087 ppm 129 24 100 Maryland Harford

8/22/2006 24-025-1001 0.087 ppm 129 24 100 Maryland Harford

6/2/2010 24-025-1001 0.087 ppm 129 24 100 Maryland Harford

6/22/2010 24-025-1001 0.087 ppm 129 24 100 Maryland Harford

6/25/2010 24-025-1001 0.087 ppm 129 24 100 Maryland Harford

6/26/2010 24-025-1001 0.087 ppm 129 24 100 Maryland Harford

4/18/2008 24-025-1001 0.086 ppm 127 24 100 Maryland 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 2010
5/31/2007 24-025-1001 0.086 ppm 127 24 100 Maryland Harford

8/30/2007 24-025-1001 0.086 ppm 127 24 100 Maryland Harford

7/16/2010 24-025-1001 0.086 ppm 127 18 75 Maryland Harford

7/17/2010 24-025-1001 0.086 ppm 127 24 100 Maryland Harford

8/16/2009 24-025-1001 0.085 ppm 124 24 100 Maryland Harford

6/13/2008 24-025-1001 0.085 ppm 124 24 100 Maryland Harford

7/29/2008 24-025-1001 0.085 ppm 124 24 100 Maryland Harford

8/25/2006 24-025-1001 0.085 ppm 124 24 100 Maryland Harford

8/6/2007 24-025-1001 0.085 ppm 124 24 100 Maryland Harford

8/1/2006 24-025-1001 0.084 ppm 122 24 100 Maryland Harford

8/17/2007 24-025-1001 0.084 ppm 122 24 100 Maryland Harford

9/26/2007 24-025-1001 0.084 ppm 122 24 100 Maryland Harford

8/18/2009 24-025-1001 0.083 ppm 119 24 100 Maryland Harford

7/3/2006 24-025-1001 0.083 ppm 119 24 100 Maryland Harford

6/19/2007 24-025-1001 0.083 ppm 119 24 100 Maryland Harford

7/15/2009 24-025-1001 0.082 ppm 116 24 100 Maryland Harford

4/19/2008 24-025-1001 0.082 ppm 116 24 100 Maryland Harford

8/7/2007 24-025-1001 0.082 ppm 116 24 100 Maryland Harford

6/23/2010 24-025-1001 0.082 ppm 116 24 100 Maryland Harford

9/2/2010 24-025-1001 0.082 ppm 116 24 100 Maryland Harford

7/16/2009 24-025-1001 0.081 ppm 114 24 100 Maryland Harford

7/16/2008 24-025-1001 0.081 ppm 114 24 100 Maryland Harford

7/28/2008 24-025-1001 0.081 ppm 114 24 100 Maryland Harford

7/21/2006 24-025-1001 0.081 ppm 114 24 100 Maryland Harford

7/27/2006 24-025-1001 0.081 ppm 114 24 100 Maryland Harford

8/2/2007 24-025-1001 0.081 ppm 114 24 100 Maryland Harford

8/25/2007 24-025-1001 0.081 ppm 114 24 100 Maryland Harford

9/4/2008 24-025-1001 0.08 ppm 111 24 100 Maryland Harford

8/24/2006 24-025-1001 0.08 ppm 111 24 100 Maryland Harford

6/1/2007 24-025-1001 0.08 ppm 111 24 100 Maryland Harford

7/3/2010 24-025-1001 0.08 ppm 111 24 100 Maryland Harford

6/12/2008 24-025-1001 0.079 ppm 109 24 100 Maryland Harford

7/12/2008 24-025-1001 0.079 ppm 109 24 100 Maryland Harford

6/1/2006 24-025-1001 0.079 ppm 109 24 100 Maryland Harford

6/29/2006 24-025-1001 0.079 ppm 109 24 100 Maryland Harford

6/27/2010 24-025-1001 0.079 ppm 109 24 100 Maryland Harford

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

6/27/2007 24-025-1001 0.078 ppm 106 24 100 Maryland Harford

7/14/2007 24-025-1001 0.078 ppm 106 24 100 Maryland Harford

8/3/2007 24-025-1001 0.078 ppm 106 24 100 Maryland Harford

7/31/2010 24-025-1001 0.078 ppm 106 24 100 Maryland Harford

7/13/2009 24-025-1001 0.077 ppm 104 24 100 Maryland Harford

5/29/2006 24-025-1001 0.077 ppm 104 24 100 Maryland Harford

7/19/2006 24-025-1001 0.077 ppm 104 24 100 Maryland Harford

7/24/2006 24-025-1001 0.077 ppm 104 24 100 Maryland Harford

5/27/2007 24-025-1001 0.077 ppm 104 24 100 Maryland Harford
9/5/2007 24-025-1001 0.077 ppm 104 24 100 Maryland Harford

5/5/2010 24-025-1001 0.077 ppm 104 16 67 Maryland Harford

9/24/2010 24-025-1001 0.077 ppm 104 18 75 Maryland Harford

8/27/2009 24-025-1001 0.076 ppm 101 24 100 Maryland Harford

7/29/2006 24-025-1001 0.076 ppm 101 24 100 Maryland Harford

7/28/2007 24-025-1001 0.076 ppm 101 24 100 Maryland Harford

5/21/2010 24-025-1001 0.076 ppm 101 24 100 Maryland Harford

8/9/2010 24-025-1001 0.076 ppm 101 24 100 Maryland Harford

8/30/2010 24-025-1001 0.076 ppm 101 24 100 Maryland 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
on-Baltimore-Northern 

ough 2010