The report below displays data on the total number of days in Colorado 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
Denver
1990
18
1991
15
1992
14
1993
19
1994
13
1995
11
1996
12
1997
7
1998
18
1999
9
2000
15
2001
17
2002
26
2003
32
2004
2
2005
11
2006
27
2007
21
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.
