The report below displays data on the total number of days in Maryland with an Air Quality Index Value of
over 100. This data has been compiled from 1990-2007. Some states have multiple monitoring stations and each will be listed in the reports below.
Other states do not have any monitoring stations in which case we have selected the closest station available.
Year
Baltimore
WashingtonDC
Wilmington-Newark
1990
50
38
0
1991
74
69
0
1992
35
30
22
1993
72
63
45
1994
61
43
46
1995
57
54
47
1996
43
39
22
1997
46
51
31
1998
70
65
42
1999
54
61
40
2000
39
35
24
2001
50
41
36
2002
59
54
34
2003
31
21
24
2004
31
21
10
2005
36
36
22
2006
34
32
20
2007
45
38
25
According to the EPA, an Air Quality Index Value of over 100 presents some level of health concern. The higher the number, the
higher the level of concern. The EPA provides the following table and more information on Air Quality Index can be found at
WikiPedia.
