The report below displays data on the total number of days with an Air Quality Index Value of over 100.
This data has been compiled from 1990-2007, and represents readings from over 100 monitoring stations throughout the country.
The number of days are an average of the monitoring stations. Of course, data like this is hard to draw many conclusions from
since the data varies greatly based upon individual monitoring station, but the results do provide a high-level look at
nationwide trends.
Year
Number of Days
1990
26.87
1991
28.29
1992
19.70
1993
25.71
1994
24.96
1995
28.82
1996
22.16
1997
22.28
1998
30.45
1999
32.81
2000
24.55
2001
26.61
2002
30.40
2003
19.57
2004
13.12
2005
21.81
2006
17.04
2007
19.17
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.
Air Quality Index Values
Levels of Health Concern
0 to 50
Good
51 to 100
Moderate
101 to 150
Unhealthy for Sensitive Groups
151 to 200
Unhealthy
201 to 300
Very Unhealthy
301 to 500
Hazardous
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