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| |
|
Most Polluted City - Air Quality in U.S. Cities,
1990–2000
(number of days with AQI values greater than 100
(1) ) |
|
|
| Metropolitan
statistical area |
1990 |
1991 |
1992 |
1993 |
1994 |
1995 |
1996 |
1997 |
1998 |
1999 |
2000 |
| Atlanta, Ga. |
42 |
23 |
20 |
36 |
15 |
35 |
25 |
31 |
50 |
61 |
26 |
| Baltimore, Md. |
29 |
50 |
23 |
48 |
41 |
36 |
28 |
30 |
51 |
40 |
16 |
| Boston,
Mass.-N.H. |
7 |
13 |
9 |
6 |
10 |
8 |
2 |
8 |
7 |
5 |
1 |
| Chicago, Ill. |
4 |
25 |
6 |
3 |
8 |
23 |
7 |
9 |
10 |
14 |
0 |
|
Cleveland/Lorain/Elyria, Ohio |
10 |
23 |
11 |
17 |
24 |
27 |
18 |
13 |
22 |
21 |
5 |
| Dallas, Tex. |
24 |
2 |
12 |
14 |
27 |
36 |
12 |
20 |
28 |
23 |
20 |
| Denver, Colo. |
9 |
6 |
11 |
6 |
2 |
3 |
0 |
0 |
7 |
3 |
2 |
| Detroit, Mich. |
11 |
27 |
7 |
5 |
11 |
14 |
13 |
11 |
17 |
15 |
3 |
| El Paso, Tex. |
19 |
7 |
10 |
7 |
11 |
8 |
7 |
4 |
6 |
6 |
3 |
| Houston, Tex. |
51 |
36 |
32 |
27 |
38 |
65 |
26 |
47 |
38 |
50 |
42 |
| Kansas City,
Mo.-Kans. |
2 |
11 |
1 |
4 |
10 |
23 |
10 |
17 |
15 |
5 |
10 |
| Los
Angeles/Long Beach, Calif. |
173 |
168 |
175 |
134 |
139 |
113 |
94 |
60 |
56 |
27 |
48 |
| Miami, Fla. |
1 |
1 |
3 |
6 |
1 |
2 |
1 |
3 |
8 |
5 |
0 |
|
Minneapolis/St. Paul, Minn.-Wis. |
4 |
2 |
1 |
0 |
2 |
5 |
0 |
0 |
1 |
0 |
0 |
| New York,
N.Y. |
36 |
49 |
10 |
19 |
21 |
19 |
15 |
23 |
17 |
24 |
12 |
| Philadelphia,
Pa.-N.J. |
39 |
49 |
27 |
62 |
37 |
38 |
38 |
38 |
37 |
32 |
18 |
| Phoenix/Mesa,
Ariz. |
12 |
11 |
11 |
15 |
10 |
22 |
15 |
12 |
14 |
10 |
10 |
| Pittsburgh,
Pa. |
19 |
21 |
9 |
13 |
19 |
25 |
11 |
21 |
39 |
23 |
4 |
| St. Louis,
Mo.-Ill. |
23 |
24 |
14 |
9 |
32 |
36 |
20 |
15 |
23 |
29 |
14 |
| San Diego,
Calif. |
96 |
67 |
66 |
59 |
46 |
48 |
31 |
14 |
33 |
16 |
14 |
| San
Francisco, Calif. |
0 |
0 |
0 |
0 |
0 |
2 |
0 |
0 |
0 |
0 |
0 |
|
Seattle/Bellevue/Everett, Wash. |
9 |
4 |
3 |
0 |
3 |
0 |
6 |
1 |
3 |
1 |
1 |
| Washington,
DC-Md.-Va.-W.Va. |
25 |
48 |
14 |
52 |
22 |
32 |
18 |
30 |
47 |
39 |
11 |
|
1. AQI—Air Quality Index. AQI measures how
polluted air is by measuring five major
pollutants: ground-level ozone, particulate
matter, carbon monoxide, sulfur dioxide, and
nitrogen oxide. Based on the amount of each
pollutant in the air, the AQI assigns a
numerical value to air quality as follows: 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).
Source: U.S. Environmental Protection
Agency, Office of Air Quality Planning &
Standards.
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