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Last updated Friday November 20, 2009 10:00 A.M.
Air Quality Index History (number of days)
| Year
| Days in Good Range
| Days in Moderate Range
| Days Unhealthy For Sensitive Groups Range |
| 1980 |
226 |
138 |
2 |
| 1981 |
232 |
133 |
0 |
| 1982 |
290 |
74 |
1 |
| 1983 |
287 |
76 |
2 |
| 1984 |
275 |
91 |
0 |
| 1985 |
287 |
76 |
2 |
| 1986 |
276 |
89 |
0 |
| 1987 |
237 |
127 |
1 |
| 1988 |
265 |
100 |
1 |
| 1989 |
275 |
90 |
0 |
| 1990 |
260 |
105 |
0 |
| 1991 |
294 |
71 |
0 |
| 1992 |
286 |
80 |
0 |
| 1993 |
269 |
96 |
0 |
| 1994 |
309 |
56 |
0 |
| 1995 |
282 |
82 |
1 |
| 1996 |
304 |
62 |
0 |
| 1997 |
282 |
82 |
1 |
| 1998 |
284 |
74 |
5 |
| 1999 |
311 |
34 |
2 |
| 2000 |
336 |
29 |
1 |
| 2001 |
353 |
12 |
0 |
| 2002 |
353 |
12 |
0 |
| 2003 |
331 |
33 |
1 |
|
2004 |
280 |
82 |
3 |
|
2005 |
275 |
85 |
5 |
|
2006 |
305 |
59 |
1
|
|
2007 |
309 |
50 |
6 |
|
2008 |
312 |
53 |
0 |
|
2009 |
292 |
29 |
1 |
The new ozone standard of .075 PPM became effective on May 27, 2008 and the new PM2.5 standard of 35 ug/m3 became effective on December 17, 2006.
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