U.S. Cities - Top Lists

Top 101 counties with the highest Particulate Matter (PM_2.5) Annual air pollution readings in 2005 (µg/m³)

1.	Allegheny County, PA (Pittsburgh, Bethel Park, Mount Lebanon), pop. 1,281,666: 21.4

2.	Riverside County, CA (Riverside, Moreno Valley, Corona), pop. 1,545,387: 21.0

3.	Hamilton County, OH (Cincinnati, Norwood, Forest Park), pop. 845,303: 20.0

4.	Kern County, CA (Bakersfield, Delano, Oildale), pop. 661,645: 19.8

5.	Jefferson County, AL (Birmingham, Hoover, Bessemer), pop. 662,047: 19.6

6.	Cuyahoga County, OH (Cleveland, Parma, Lakewood), pop. 1,393,978: 19.4

7.	San Bernardino County, CA (San Bernardino, Ontario, Fontana), pop. 1,709,434: 18.8

8.	Tulare County, CA (Visalia, Tulare, Porterville), pop. 368,021: 18.8

9.	Wayne County, MI (Detroit, Livonia, Dearborn), pop. 2,061,162: 18.6

10.	Stark County, OH (Canton, Massillon, Alliance), pop. 378,098: 18.6

11.	Clark County, IN (Jeffersonville, Clarksville, Sellersburg), pop. 96,472: 18.5

12.	Beaver County, PA (Aliquippa, Beaver Falls, Economy), pop. 181,412: 18.3

13.	Lancaster County, PA (Lancaster, Ephrata, Elizabethtown), pop. 470,658: 18.2

14.	Madison County, IL (Granite City, Alton, Collinsville), pop. 258,941: 18.2

15.	Cabell County, WV (Huntington, Pea Ridge, Barboursville), pop. 96,784: 18.1

16.	York County, PA (York, Hanover, Shiloh), pop. 381,751: 18.1

17.	Jefferson County, OH (Steubenville, Toronto, Wintersville), pop. 73,894: 18.1

18.	Butler County, OH (Hamilton, Middletown, Fairfield), pop. 332,807: 17.9

19.	Marion County, IN (Indianapolis, Lawrence, Beech Grove), pop. 860,454: 17.9

20.	Los Angeles County, CA (Los Angeles, Long Beach, Glendale), pop. 9,519,338: 17.8

21.	Kanawha County, WV (Charleston, South Charleston, St. Albans), pop. 200,073: 17.6

22.	Kings County, CA (Hanford, Lemoore, Avenal), pop. 129,461: 17.5

23.	Cook County, IL (Chicago, Cicero, Arlington Heights), pop. 5,376,741: 17.5

24.	Montgomery County, OH (Dayton, Kettering, Huber Heights), pop. 559,062: 17.4

25.	Brooke County, WV (Follansbee, Hooverson Heights, Wellsburg), pop. 25,447: 17.4

26.	Hancock County, WV (Weirton, Chester, Newell), pop. 32,667: 17.3

27.	Baltimore city, MD, pop. 651,154: 17.2

28.	St. Clair County, IL (Belleville, East St. Louis, O'Fallon), pop. 256,082: 17.1

29.	Berkeley County, WV (Martinsburg, Inwood, Hedgesville), pop. 75,905: 17.0

30.	Lawrence County, OH (Ironton, South Point, Burlington), pop. 62,319: 17.0

31.	New York County, NY, pop. 1,537,195: 17.0

32.	Fulton County, GA (Atlanta, Sandy Springs, Roswell), pop. 816,006: 17.0

33.	Mahoning County, OH (Youngstown, Boardman, Austintown), pop. 257,555: 16.9

34.	Fresno County, CA (Fresno, Clovis, Reedley), pop. 799,407: 16.9

35.	Bronx County, NY (New York, Bronx), pop. 1,332,650: 16.9

36.	Dubois County, IN (Jasper, Huntingburg, Ferdinand), pop. 39,674: 16.9

37.	Spencer County, IN (Rockport, Santa Claus, Dale), pop. 20,391: 16.8

38.	Westmoreland County, PA (Greensburg, New Kensington, Lower Burrell), pop. 369,993: 16.8

39.	Floyd County, IN (New Albany, Georgetown, Galena), pop. 70,823: 16.8

40.	Jefferson County, KY (Louisville, Jeffersontown, Valley Station), pop. 693,604: 16.8

41.	Berks County, PA (Reading, Wyomissing, Kutztown), pop. 373,638: 16.8

42.	Cambria County, PA (Johnstown, Westmont, Northern Cambria), pop. 152,598: 16.8

43.	Vanderburgh County, IN (Evansville, Highland, Melody Hill), pop. 171,922: 16.7

44.	Clayton County, GA (Forest Park, Riverdale, Irondale), pop. 236,517: 16.7

45.	Clark County, OH (Springfield, Northridge, New Carlisle), pop. 144,742: 16.7

46.	Bibb County, GA (Macon, Payne, Lizella), pop. 153,887: 16.7

47.	Floyd County, GA (Rome, Lindale, Shannon), pop. 90,565: 16.6

48.	Walker County, GA (Fairview, Chattanooga Valley, Rossville), pop. 61,053: 16.6

49.	Delaware County, PA (Chester, Drexel Hill, Springfield), pop. 550,864: 16.5

50.	Franklin County, OH (Columbus, Westerville, Upper Arlington), pop. 1,068,978: 16.5

51.	Washington County, PA (Washington, Canonsburg, Donora), pop. 202,897: 16.4

52.	Wood County, WV (Parkersburg, Vienna, Blennerhassett), pop. 87,986: 16.4

53.	Summit County, OH (Akron, Cuyahoga Falls, Stow), pop. 542,899: 16.4

54.	Trumbull County, OH (Warren, Niles, Girard), pop. 225,116: 16.4

55.	Delaware County, IN (Muncie, Yorktown, Albany), pop. 118,769: 16.4

56.	Lorain County, OH (Lorain, Elyria, North Ridgeville), pop. 284,664: 16.4

57.	Bullitt County, KY (Mount Washington, Shepherdsville, Hillview), pop. 61,236: 16.3

58.	Cobb County, GA (Marietta, Smyrna, Mableton), pop. 607,751: 16.3

59.	Knox County, TN (Knoxville, Farragut, Mascot), pop. 382,032: 16.3

60.	Scioto County, OH (Portsmouth, Wheelersburg, West Portsmouth), pop. 79,195: 16.2

61.	Marshall County, WV (Moundsville, McMechen, Benwood), pop. 35,519: 16.2

62.	Madison County, IN (Anderson, Elwood, Alexandria), pop. 133,358: 16.1

63.	Hamilton County, TN (Chattanooga, East Ridge, East Brainerd), pop. 307,896: 16.1

64.	St. Louis city, MO, pop. 348,189: 16.1

65.	Loudon County, TN (Lenoir City, Loudon, Greenback), pop. 39,086: 16.1

66.	Gwinnett County, GA (Lawrenceville, Duluth, Snellville), pop. 588,448: 16.1

67.	Fayette County, KY (Lexington-Fayette, Colony), pop. 260,512: 16.1

68.	Richmond County, GA (Hephzibah, Blythe, Augusta), pop. 199,775: 16.1

69.	Pulaski County, AR (Little Rock, North Little Rock, Jacksonville), pop. 361,474: 16.1

70.	Camden County, NJ (Camden, Pennsauken, Lindenwold), pop. 508,932: 16.1

71.	Boyd County, KY (Ashland, Westwood, Catlettsburg), pop. 49,752: 16.0

72.	Winnebago County, IL (Rockford, Machesney Park, Loves Park), pop. 278,418: 16.0

73.	Salem city, VA, pop. 24,747: 16.0

74.	Catawba County, NC (Hickory, Newton, St. Stephens), pop. 141,685: 16.0

75.	Howard County, IN (Kokomo, Indian Heights, Greentown), pop. 84,964: 15.9

76.	Kane County, IL (Aurora, Elgin, Carpentersville), pop. 404,119: 15.9

77.	Marion County, WV (Fairmont, Pleasant Valley, Mannington), pop. 56,598: 15.9

78.	Harris County, TX (Houston, Pasadena, Baytown), pop. 3,400,578: 15.9

79.	Kenton County, KY (Covington, Erlanger, Independence), pop. 151,464: 15.9

80.	Chester County, PA (West Chester, Phoenixville, Coatesville), pop. 433,501: 15.9

81.	DeKalb County, GA (North Atlanta, Redan, Dunwoody), pop. 665,865: 15.8

82.	Lucas County, OH (Toledo, Oregon, Sylvania), pop. 455,054: 15.8

83.	Davidson County, NC (Lexington, Thomasville, Welcome), pop. 147,246: 15.8

84.	Greenville County, SC (Greenville, Wade Hampton, Taylors), pop. 379,616: 15.8

85.	Mecklenburg County, NC (Charlotte, Huntersville, Matthews), pop. 695,454: 15.8

86.	Lake County, IN (Gary, Hammond, East Chicago), pop. 484,564: 15.8

87.	Lincoln County, MT (Libby, Eureka, Troy), pop. 18,837: 15.8

88.	Tippecanoe County, IN (Lafayette, West Lafayette, Shadeland), pop. 148,955: 15.7

89.	Clermont County, OH (Milford, Summerside, Mount Carmel), pop. 177,977: 15.7

90.	Knox County, IN (Vincennes, Bicknell, Oaktown), pop. 39,256: 15.7

91.	Monroe County, MI (Monroe, Lambertville, Temperance), pop. 145,945: 15.7

92.	Wilkinson County, GA (Gordon, Ivey, McIntyre), pop. 10,220: 15.7

93.	Henry County, IN (New Castle, Middletown, Knightstown), pop. 48,508: 15.7

94.	Allen County, IN (Fort Wayne, New Haven, Leo-Cedarville), pop. 331,849: 15.7

95.	Anne Arundel County, MD (Glen Burnie, Annapolis, Severn), pop. 489,656: 15.7

96.	District of Columbia, DC, pop. 572,059: 15.7

97.	Russell County, AL (Phenix City, Ladonia, Hurtsboro), pop. 49,756: 15.7

98.	Washtenaw County, MI (Ann Arbor, Ypsilanti, Saline), pop. 322,895: 15.6

99.	Preble County, OH (Eaton, Camden, Lewisburg), pop. 42,337: 15.6

100.	DuPage County, IL (Naperville, Wheaton, Downers Grove), pop. 904,161: 15.6

101.	Greene County, OH (Beavercreek, Fairborn, Xenia), pop. 147,886: 15.5

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