| Pittsburgh, PA Tuesday May 22, 2012 |
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 PG Benchmarks: Air Quality Index
Sunday, February 24, 2002
Air Quality Index is the number of days in that year that the concentration of ozone, carbon monoxide, particulates and sulfur dioxide in the air people breathe is greater than 100, which puts it in the unhealthy range. PM is the concentration in micrograms (10 and 2.5) of particulate matter per cubic meter at the highest monitoring site in the metropolitan area. A value of 50 or more puts the area above the federal health standard.
Metro area
AQI
'98
AQI
'99I
AQI
'00
PM10
'98
PM10
'99
PM10
'00
PM 2.5
annual mean/
24 hr. for '00
Atlanta
50
61
26
31
35
36
21.4/50
Cincinnati
14
12
4
32
31
32
19.7/44
Cleveland
22
21
5
45
42
43
19.8/46
Denver
7
3
2
36
37
43
11.6/41
Kansas City
15
5
10
35
40
37
13.4/32
Miami
8
5
0
28
24
26
11.3/24
Milwaukee
10
13
2
30
27
21
14.2/35
Minneapolis/St. Paul
1
0
0
ind*
35
36
ind
Phoenix/Mesa
14
10
10
81
60
70
ind
Pittsburgh
39
23
4
41
37
39
20/80
Portland/Vancouver
3
2
0
29
16
16
10.8/40
St. Louis
23
29
14
46
44
45
16.8/43
San Diego
33
16
14
43
52
31
15.9/ind
Seattle
3
1
1
15
16
23
12.7/43
Tampa
11
9
6
32
35
33
13.5/43
*ind: insufficient data
National Ambient Air Quality Standards for:
Source: U.S. Environmental Protection Agency
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