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Air Quality Index Report

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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