Most Polluted Cities

Table 1:People at Risk In 25 U.S. Cities Most Polluted by Short-Term Particle Pollution (24-Hour PM2.5)

2005 Rank Metropolitan
Statistical Areas		 Total Population
1 Los Angeles
Long Beach
Riverside, CA		 17,262,730
2 Fresno-
Madera,CA		 850,325
3 Bakersfield,CA 713,087
4 Pittsburgh-
New Castle,PA		 2,503,738
5 Eugene-
Springfield,OR		 330,527
6 Salt Lake
City-Ogden-
Clearfield,UT		 1,536,187
7 Sacramento-
Arden-Arcade-
Truckee, CA-NV		 2,115,019
8 Cleveland-
Akron-
Elyria,OH		 2,944,276
9 Visalia-
Porterville,CA		 390,791
10 Birmingham-
Hoover-Cullman,AL		 1,150,916
11 Detroit-
Warren-
Flint,MI		 5,415,338
12 Washington-
Baltimore-
Northern
Virginia,DC-
MD-VA-WV		 7,910,633
13 Louisville-
Elizabethtown-
Scottsburg,KY-IN		 1,323,199
13 Chicago-
Naperville-
Michigan
City,IL-IN-WI		 9,549,014
15 Provo-
Orem,UT		 406,851
15 Hanford-
Corcoran,CA		 138,564
17 Weirton-
Steubenville, WV-OH		 128,569
18 Cincinnati-
Middletown-
Wilmington,OH-KY-IN		 2,089,089
19 Modesto,CA 492,233
20 Philadelphia-
Camden-
Vineland,PA-
NJ-DE-MD		 5,922,253
20 San Diego-
Carlsbad-San
Marcos,CA		 2,930,886
22 Allentown-
Bethlehem-
Easton, PA-NJ		 768,036
23 San Jose-San
Francisco-
Oakland,CA		 7,154,350
24 Harrisburg-
Carlisle-
Lebanon,PA		 640,120
25 New York-
Newark-
Bridgeport,NY-
NJ-CT-PA		 21,766,731

Table 2:People at Risk In 25 U.S. Cities Most Polluted by Year-Round Particle Pollution (Annual PM2.5)

2005 Rank Metropolitan
Statistical Areas		 Total Population
1 Los Angeles-
Long Beach-
Riverside,CA		 17,262,730
2 Bakersfield,CA 713,087
3 Visalia-
Porterville,CA		 390,791
4 Pittsburgh-New
Castle,PA		 2,503,738
5 Fresno-
Madera,CA		 850,325
6 Detroit-Warren-
Flint,MI		 5,415,338
7 Hanford-
Corcoran,CA		 138,564
8 Cleveland-Akron-
Elyria,OH		 2,944,276
9 Atlanta-Sandy
Springs-
Gainesville,GA		 4,929,880
10 Weirton-
Steubenville,
WV-OH		 128,569
10 Cincinnati-
Middletown-
Wilmington,
OH-KY-IN		 2,089,089
12 New York-
Newark-
Bridgeport, NY-NJ-CT-PA		 21,766,731
12 Chicago-
Naperville-
Michigan City,IL-IN-WI		 9,549,014
14 St. Louis-St.
Charles-
Farmington,MO-IL		 2,793,856
15 Canton-
Massillon,OH		 407,118
15 Birmingham-
Hoover-Cullman,AL		 1,150,916
17 Charleston,WV 306,836
18 York-Hanover-
Gettysburg,PA		 491,375
18 Merced,CA 231,574
18 Lancaster,PA 482,775
21 Louisville-
Elizabethtown-
Scottsburg,KY-IN		 1,323,199
22 Indianapolis-
Anderson-
Columbus,IN		 1,912,560
22 Columbus-
Marion-
Chillicothe,OH		 1,900,497
24 Washington-
Baltimore-
Northern
Virginia,DC-MD-VA-WV		 7,910,633
24 Huntington-
Ashland,WV-KY-OH		 286,517

Table 3:People at Risk In 25 Counties Most Polluted by Short-Term Particle Pollution (24-Hour PM2.5)

2005 Rank County State Total Population
1 Riverside CA 1,782,650
2 Fresno CA 850,325
3 Kern CA 713,087
4 Los Angeles CA 9,871,506
5 Allegheny PA 1,261,303
6 San Bernardino CA 1,859,678
7 Lane OR 330,527
8 Orange CA 2,957,766
9 Salt Lake UT 924,247
10 Sacramento CA 1,330,711
11 Cuyahoga OH 1,363,888
12 Tulare CA 390,791
13 Jefferson AL 658,141
14 Klamath OR 64,769
15 Wayne MI 2,028,778
16 Baltimore City MD 628,670
17 Lake IN 487,476
17 Jefferson KY 699,017
19 Kings CA 138,564
19 Utah UT 398,059
21 Jefferson OH 71,888
21 Cook IL 5,351,552
23 Hamilton OH 823,472
24 Stanislaus CA 492,233
25 Philadelphia PA 1,479,339
25 San Diego CA 2,930,886

Table 4:People at Risk In 25 Counties Most Polluted by Long-Term Particle Pollution (Annual PM2.5)

2005 Rank County ST Total Population
1 Riverside CA 1,782,650
2 San Bernardino CA 1,859,678
3 Los Angeles CA 9,871,506
4 Kern CA 713,087
5 Tulare CA 390,791
6 Allegheny PA 1,261,303
7 Fresno CA 850,325
8 Wayne MI 2,028,778
9 Orange CA 2,957,766
10 Kings CA 138,564
11 Cuyahoga OH 1,363,888
12 Fulton GA 818,322
13 Hamilton OH 823,472
13 Jefferson OH 71,888
15 Lake IN 487,476
15 New York NY 1,564,798
17 Madison IL 261,689
18 Hancock WV 31,742
19 Cook IL 5,351,552
19 Jefferson AL 658,141
19 Stark OH 377,519
22 Scioto OH 77,453
23 Kanawha WV 195,413
24 Merced CA 231,574
24 Lancaster PA 482,775
24 York PA 394,919