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Rankings


(Click for a note on ranking*)

Metropolitan Areas Most Polluted by Short-term Particle Pollution (24-Hour PM2.5)

Rank Metropolitan Area
1 LOS ANGELES-LONG BEACH-RIVERSIDE, CA
2 FRESNO-MADERA, CA
3 BAKERSFIELD, CA
4 PITTSBURGH-NEW CASTLE, PA
5 EUGENE-SPRINGFIELD, OR
6 BIRMINGHAM-HOOVER-CULLMAN, AL
6 SALT LAKE CITY-OGDEN-CLEARFIELD, UT
8 SACRAMENTO-ARDEN-ARCADE-TRUCKEE, CA-NV
9 VISALIA-PORTERVILLE, CA
10 CLEVELAND-AKRON-ELYRIA, OH
11 MODESTO, CA
12 HANFORD-CORCORAN, CA
12 CHICAGO-NAPERVILLE-MICHIGAN CITY, IL-IN-WI
12 DETROIT-WARREN-FLINT, MI
15 SAN JOSE-SAN FRANCISCO-OAKLAND, CA
16 SAN DIEGO-CARLSBAD-SAN MARCOS, CA
17 CINCINNATI-MIDDLETOWN-WILMINGTON, OH-KY-IN
18 WASHINGTON-BALTIMORE-NORTHERN VIRGINIA, DC-MD-VA-WV
18 PROVO-OREM, UT
20 LOUISVILLE-ELIZABETHTOWN-SCOTTSBURG, KY-IN
21 WEIRTON-STEUBENVILLE, WV-OH
22 SEATTLE-TACOMA-OLYMPIA, WA
23 MERCED, CA
23 MEDFORD, OR
23 HARRISBURG-CARLISLE-LEBANON, PA

Metropolitan Areas Most Polluted by Year-Round Particle Pollution(Annual PM2.5)

Rank Metropolitan Areas
1 LOS ANGELES-LONG BEACH-RIVERSIDE, CA
2 VISALIA-PORTERVILLE, CA
3 BAKERSFIELD, CA
4 FRESNO-MADERA, CA
5 PITTSBURGH-NEW CASTLE, PA
6 DETROIT-WARREN-FLINT, MI
7 ATLANTA-SANDY SPRINGS-GAINESVILLE, GA
8 CLEVELAND-AKRON-ELYRIA, OH
9 HANFORD-CORCORAN, CA
9 BIRMINGHAM-HOOVER-CULLMAN, AL
11 CINCINNATI-MIDDLETOWN-WILMINGTON, OH-KY-IN
12 KNOXVILLE-SEVIERVILLE-LA FOLLETTE, TN
13 WEIRTON-STEUBENVILLE, WV-OH
14 CHICAGO-NAPERVILLE-MICHIGAN CITY, IL-IN-WI
15 CANTON-MASSILLON, OH
16 CHARLESTON, WV
17 MODESTO, CA
18 NEW YORK-NEWARK-BRIDGEPORT, NY-NJ-CT-PA
18 MERCED, CA
20 ST. LOUIS-ST. CHARLES-FARMINGTON, MO-IL
21 WASHINGTON-BALTIMORE-NORTHERN VIRGINIA, DC-MD-VA-WV
22 LOUISVILLE-ELIZABETHTOWN-SCOTTSBURG, KY-IN
22 HUNTINGTON-ASHLAND, WV-KY-OH
24 YORK-HANOVER-GETTYSBURG, PA
24 LANCASTER, PA
24 COLUMBUS-MARION-CHILLICOTHE, OH

Top 25 Cleanest Cities for Year-Round Particle Pollution (Annual PM2.5)

Rank Metropolitan Area
1 SANTA FE-ESPANOLA, NM
2 HONOLULU, HI
3 CHEYENNE, WY
4 GREAT FALLS, MT
5 FARMINGTON, NM
5 ANCHORAGE, AK
5 ALBUQUERQUE, NM
8 BISMARCK, ND
9 KENNEWICK-RICHLAND-PASCO, WA
10 LUBBOCK-LEVELLAND, TX
10 BILLINGS, MT
12 IDAHO FALLS-BLACKFOOT, ID
13 GRAND JUNCTION, CO
13 COLORADO SPRINGS, CO
15 BELLINGHAM, WA
16 RAPID CITY, SD
16 FARGO-WAHPETON, ND-MN
18 PUEBLO, CA
19 FORT COLLINS-LOVELAND, CO
20 SALEM, OR
21 DULUTH, MN-WI
21 ALBANY-CORVALLIS-LEBANON, OR
23 SALINAS, CA
24 CAPE CORAL-FORT MYERS, FL
25 PORT ST. LUCIE-FORT PIERCE, FL

Top 25 Cleanest U.S. Counties for Year-Round Particle Pollution (Annual PM2.5)

Rank County
1 ELBERT, CO
2 MAUI, HI
3 SANTA FE, NM
3 HONOLULU, HI
3 SANDOVAL, NM
6 LARAMIE, WY
7 LA PLATA, CO
8 BURKE, ND
9 VILAS, WI
10 GRANT, NM
10 CASCADE, MT
10 MATANUSKA-SUSITNA, AK
10 MERCER, ND
14 SCOTTS BLUFF, NE
14 JUNEAU, AK
14 HANCOCK, ME
17 CAMPBELL, WY
18 SAN JUAN, NM
18 ANCHORAGE, AK
18 BERNALILLO, NM
18 ESSEX, NY
22 COLUMBIA, OR
22 GUNNISON, CO
22 SANDERS, MT
25 BURLEIGH, ND

Top 26 U.S. Counties Most Polluted by Annual Particle Pollution (Annual PM2.5)

Rank County
1 RIVERSIDE, CA
2 SAN BERNARDINO, CA
3 LOS ANGELES, CA
4 TULARE, CA
5 KERN, CA
6 FRESNO, CA
7 ALLEGHENY, PA
8 ORANGE, CA
9 WAYNE, MI
10 FULTON, GA
11 CUYAHOGA, OH
12 KINGS, CA
12 JEFFERSON, AL
14 HAMILTON, OH
15 KNOX, TN
16 JEFFERSON, OH
17 COOK, IL
18 STARK, OH
19 KANAWHA, WV
20 STANISLAUS, CA
20 LAKE, IN
22 NEW YORK, NY
22 MERCED, CA
24 HANCOCK, WV
24 MADISON, IL
24 SCIOTO, OH

Cleanest U.S. Cities for Ozone Air Pollution (alphabetically)

Metropolitan Area Population
AMES-BOONE, IA 106,816
BELLINGHAM, WA 174,362
BROWNSVILLE-HARLINGEN-RAYMONDVILLE, TX 373,551
COLORADO SPRINGS, CO 565,404
DULUTH, MN-WI 276,298
EUGENE-SPRINGFIELD, OR 326,666
FARGO-WAHPETON, ND-MN 201,602
FLAGSTAFF, AZ 120,295
GREELEY, CO 205,014
HONOLULU, HI 896,019
LAREDO, TX 207,611
LINCOLN, NE 274,178
LOGAN, UT-ID 105,394
MEDFORD, OR 186,430
MOUNT VERNON-ANACORTES, WA 106,906
RENO-SPARKS, NV 365,748
SALEM, OR 357,812
SALINAS, CA 413,408
SAN LUIS OBISPO-PASO ROBLES, CA 253,408
SIOUX FALLS, SD 194,654
SPOKANE, WA 427,506
TALLAHASSEE, FL 327,869

Metropolitan Areas with the Worst Ozone Air Pollution

Rank Metropolitan Statistical Areas
1 LOS ANGELES-RIVERSIDE-ORANGE COUNTY, CA
2 FRESNO, CA
3 BAKERSFIELD, CA
4 VISALIA- -PORTERVILLE, CA
5 HOUSTON-BAYTOWN-HUNTSVILLE, TX CMSA
6 MERCED, CA
7 SACRAMENTO-ARDEN-ARCADE--TRUCKEE, CA-NV
8 HANFORD-CORCORAN, CA
9 KNOXVILLE-SEVIERVILLE-LA FOLLETTE, TN
10 DALLAS-FORT WORTH, TX CMSA
11 WASHINGTON-BALTIMORE-NORTHERN VIRGINIA, DC-MD-VA-WV
12 PHILADELPHIA-WILMINGTON-ATLANTIC CITY, PA-NJ-DE-MD CMSA
13 NEW YORK-NEWARK-BRIDGEPORT, NY-NJ-CT-PA
14 CHARLOTTE-GASTONIA-SALISBURY, NC-SC
15 CLEVELAND-AKRON-ELYRIA, OH
16 GREENSBORO--WINSTON-SALEM--HIGH POINT, NC
17 PITTSBURGH-NEW CASTLE, PA
18 PHOENIX-MESA-SCOTTSDALE, AZ
18 SAN DIEGO,-CARLSBAD-SAN MARCOSCA
20 MODESTO, CA
21 ATLANTA-SANDY SPRINGS-GAINSVILLE, GA
22 MORRISTOWN-NEWPORT, TN
23 RALEIGH-DURHAM-CARY, NC
23 LANCASTER, PA
25 SHEBOYGAN, WI

Counties with the Worst Ozone Air Pollution*

County 2004 Rank 2003 Rank 2002 Rank 2001 Rank 2000 Rank
SAN BERNARDINO, CA 1 1 1 1 1
FRESNO, CA 2 2 3 4 4
KERN, CA 3 3 2 3 3
RIVERSIDE, CA 4 5 4 2 2
TULARE, CA 5 4 5 5 6
LOS ANGELES, CA 6 7 8 8 5
HARRIS, TX 7 6 6 6 8
MERCED, CA 8 9 9 23 16
EL DORADO, CA 9 8 14 18 17
KINGS, CA 10 10 11 21 9
SEVIER, TN 11 12 10 12 19
NEVADA, CA 12 13 28 50 35
SACRAMENTO, CA 12 14 20 33 20
TARRANT, TX 14 19 37 46 46
HARFORD, MD 15 25 50 30 32
CAMDEN, NJ 16 24 27 16 21
VENTURA, CA 17 15 21 14 7
ANNE ARUNDEL, MD 17 18 15 10 11
OCEAN, NJ 17 29 38 28 24
ROWAN, NC 20 16 22 19 31
FAIRFIELD, CT 21 29 61 34 39
MECKLENBURG, NC 22 19 12 11 12
PLACER, CA 23 17 31 60 37
CECIL, MD 24 29 40 41 40
GLOUCESTER, NJ 25 47 65 43 44


Counties Eliminated from the Top 25 Most Ozone-Polluted List (between State of the Air 2003 and 2004)

County 2003 Rank 2003 Grade 2004 Rank 2004 Grade
FULTON, GA 11 F 51 F
DEKALB, GA 21 F 52 F
HENRY, GA 22 F 57 F
ROCKDALE, GA 22 F 121 F


* In 2003, the U.S. Census Bureau published revised definitions for the nation's Metropolitan Statistical Areas. Therefore, comparisons between MSAs of previous reports and State of the Air: 2004 should be made with caution.

** Alabama, Connecticut, Florida, Maine, Massachusetts, and Washington adopted shorter ozone seasons. Kentucky and Tennessee adopted longer ozone seasons. These analyses use the revised season data for all three years. No grades were affected by the difference in season length, but comparisons with weighted averages and, therefore, rankings may be slightly affected.



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