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Most Polluted Metropolitan Areas and Counties

Table 1:
People at Risk In 25 U.S. Cities Most Polluted by Short-Term Particle Pollution (24-Hour PM2.5)
Table 2:
People at Risk In 25 U.S. Cities Most Polluted by Year-Round Particle Pollution (Annual PM2.5)
Table 3:
People at Risk In 25 Counties Most Polluted by Short-Term Particle Pollution (24-Hour PM2.5)

Table 4:
People at Risk In 25 Counties Most Polluted by Short-Term Particle Pollution (24-Hour PM2.5)

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

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

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

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

 

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