The report below displays data on the total number of days in Oregon 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
Portland-Vancouver
1990
15
1991
10
1992
9
1993
1
1994
5
1995
4
1996
12
1997
0
1998
9
1999
6
2000
5
2001
4
2002
7
2003
2
2004
4
2005
4
2006
2
2007
5
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.
