Top 101 counties with the highest Particulate Matter (PM2.5) 24-hour air pollution readings in 2005 (µg/m3)

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Value distibution for all U.S. cities

RankCityValue
1.
Kings County, CA (Hanford, Lemoore, Avenal) (pop. 129,461)75
2.
Kern County, CA (Bakersfield, East Kern, Delano) (pop. 661,645)75
3.
Fresno County, CA (Fresno, Clovis, Reedley) (pop. 799,407)71
4.
Allegheny County, PA (Pittsburgh, Penn Hills, Bethel Park) (pop. 1,281,666)70
5.
Tulare County, CA (Visalia, Tulare, Porterville) (pop. 368,021)65
6.
Cache County, UT (Logan, Smithfield, Hyrum) (pop. 91,391)62
7.
Lane County, OR (Eugene, Springfield, Badger Mountain) (pop. 322,959)58
8.
Riverside County, CA (Riverside, Perris Valley, Moreno Valley) (pop. 1,545,387)58
9.
Franklin County, ID (Preston, Mink Creek, Franklin) (pop. 11,329)56
10.
Stanislaus County, CA (Modesto, Turlock, Ceres) (pop. 446,997)55
11.
Butte County, CA (Chico, Paradise, Oroville) (pop. 203,171)54
12.
Los Angeles County, CA (Los Angeles, East San Gabriel Valley, Long Beach) (pop. 9,519,338)53
13.
Oakland County, MI (Farmington Hills, Troy, Southfield) (pop. 1,194,156)52
14.
Washtenaw County, MI (Ann Arbor, Ypsilanti, Saline) (pop. 322,895)52
15.
Beaver County, PA (Aliquippa, Beaver Falls, Economy) (pop. 181,412)52
16.
Wayne County, MI (Detroit, Livonia, Dearborn) (pop. 2,061,162)52
17.
Cook County, IL (Chicago, Cicero, Arlington Heights) (pop. 5,376,741)52
18.
Cuyahoga County, OH (Cleveland, Parma, Lakewood) (pop. 1,393,978)51
19.
Hamilton County, OH (Cincinnati, Norwood, Forest Park) (pop. 845,303)51
20.
Lincoln County, MT (Libby, Eureka, Pioneer Junction) (pop. 18,837)51
21.
Jefferson County, AL (Birmingham, Hoover, Bessemer) (pop. 662,047)50
22.
San Bernardino County, CA (San Bernardino, Ontario, Fontana) (pop. 1,709,434)50
23.
Klamath County, OR (Altamont, Klamath Falls, Keno) (pop. 63,775)49
24.
Tippecanoe County, IN (Lafayette, West Lafayette, Purdue University) (pop. 148,955)49
25.
Sacramento County, CA (Sacramento, Mather, Arden-Arcade) (pop. 1,223,499)49
26.
Monroe County, MI (Monroe, Lambertville, Temperance) (pop. 145,945)49
27.
St. Clair County, MI (Port Huron, Marysville, St. Clair) (pop. 164,235)48
28.
Merced County, CA (Merced, Los Banos, Atwater) (pop. 210,554)48
29.
Winnebago County, IL (Rockford, Machesney Park, Loves Park) (pop. 278,418)47
30.
Lake County, IL (Waukegan, North Chicago, Highland Park) (pop. 644,356)47
31.
Placer County, CA (Roseville, Loomis Basin-Folsom Lake, Rocklin) (pop. 248,399)47
32.
Clark County, IN (Jeffersonville, Clarksville, Sellersburg) (pop. 96,472)46
33.
Marion County, IN (Indianapolis, Lawrence, Beech Grove) (pop. 860,454)46
34.
Shoshone County, ID (Kellogg, Pinehurst, Osburn) (pop. 13,771)46
35.
Hancock County, WV (Weirton, Chester, Newell) (pop. 32,667)45
36.
Trumbull County, OH (Warren, Niles, Girard) (pop. 225,116)45
37.
Summit County, OH (Akron, Cuyahoga Falls, Stow) (pop. 542,899)45
38.
Kent County, MI (Grand Rapids, Wyoming, Kentwood) (pop. 574,335)45
39.
Franklin County, OH (Columbus, Westerville, Upper Arlington) (pop. 1,068,978)45
40.
Butler County, OH (Hamilton, Middletown, Fairfield) (pop. 332,807)45
41.
Madison County, IL (Granite City, Alton, Collinsville) (pop. 258,941)45
42.
Will County, IL (Joliet, Bolingbrook, Homer Glen) (pop. 502,266)45
43.
Lancaster County, PA (Lancaster, Ephrata, Elizabethtown) (pop. 470,658)45
44.
Montgomery County, OH (Dayton, Kettering, Huber Heights) (pop. 559,062)45
45.
Lucas County, OH (Toledo, Oregon, Sylvania) (pop. 455,054)45
46.
Salt Lake County, UT (Salt Lake City, West Valley City, Sandy) (pop. 898,387)44
47.
Dodge County, WI (Beaver Dam, Mayville, Horicon) (pop. 85,897)44
48.
Jefferson County, OH (Steubenville, Toronto, Wintersville) (pop. 73,894)44
49.
Lake County, IN (Gary, Hammond, East Chicago) (pop. 484,564)44
50.
Brown County, WI (Green Bay, De Pere, Ashwaubenon) (pop. 226,778)44
51.
Canyon County, ID (Nampa, Caldwell, Huston) (pop. 131,441)44
52.
Union County, NJ (Elizabeth, Union, Plainfield) (pop. 522,541)44
53.
Kane County, IL (Aurora, Elgin, Carpentersville) (pop. 404,119)44
54.
San Joaquin County, CA (Stockton, Lodi, Tracy) (pop. 563,598)44
55.
St. Louis County, MO (Florissant, Chesterfield, University City) (pop. 1,016,315)44
56.
Lake County, OH (Mentor, Willoughby, Eastlake) (pop. 227,511)44
57.
Vigo County, IN (Terre Haute, North Terre Haute, West Terre Haute) (pop. 105,848)43
58.
Niagara County, NY (Niagara Falls, North Tonawanda, Lockport) (pop. 219,846)43
59.
Vanderburgh County, IN (Evansville, Melody Hill, Darmstadt) (pop. 171,922)43
60.
Montgomery County, TN (Clarksville, St. Bethlehem, Woodlawn-Dotsonville) (pop. 134,768)43
61.
Missoula County, MT (Missoula, Orchard Homes, Seeley Lake-Blackfoot Valley) (pop. 95,802)43
62.
Stark County, OH (Canton, Massillon, Alliance) (pop. 378,098)43
63.
Shelby County, TN (Memphis, Bartlett, Germantown) (pop. 897,472)43
64.
Jefferson County, KY (Louisville, Jeffersontown, Pleasure Ridge Park) (pop. 693,604)43
65.
Mahoning County, OH (Youngstown, Boardman, Austintown) (pop. 257,555)43
66.
Cambria County, PA (Johnstown, Westmont, Northern Cambria) (pop. 152,598)43
67.
McLean County, IL (Bloomington, Normal, Le Roy) (pop. 150,433)43
68.
DuPage County, IL (Naperville, Wheaton, Downers Grove) (pop. 904,161)42
69.
Knox County, IN (Vincennes, Bicknell, Freelandville) (pop. 39,256)42
70.
Ottawa County, MI (Holland, Jenison, Allendale) (pop. 238,314)42
71.
Orange County, CA (North Coast, Santa Ana, Anaheim) (pop. 2,846,289)42
72.
Jefferson County, MO (Arnold, Festus, Murphy) (pop. 198,099)42
73.
Macon County, IL (Decatur, Mount Zion, Forsyth) (pop. 114,706)42
74.
Portage County, OH (Kent, Aurora, Streetsboro) (pop. 152,061)42
75.
Milwaukee County, WI (Milwaukee, West Allis, Wauwatosa) (pop. 940,164)42
76.
Baltimore city, MD (Baltimore) (pop. 651,154)42
77.
Clark County, OH (Springfield, Northridge, New Carlisle) (pop. 144,742)42
78.
Macomb County, MI (Warren, Sterling Heights, Shelby) (pop. 788,149)42
79.
Kenton County, KY (Covington, Erlanger, Independence) (pop. 151,464)42
80.
Sutter County, CA (Yuba City, South Yuba City, Tierra Buena) (pop. 78,930)42
81.
Sumner County, TN (Hendersonville, Gallatin, Portland) (pop. 130,449)41
82.
St. Louis city, MO (St. Louis) (pop. 348,189)41
83.
Bay County, MI (Bay City, Essexville, Auburn) (pop. 110,157)41
84.
Scott County, IA (Davenport, Bettendorf, Eldridge) (pop. 158,668)41
85.
Bergen County, NJ (Hackensack, Teaneck, Fort Lee) (pop. 884,118)41
86.
Muskegon County, MI (Muskegon, Norton Shores, Muskegon Heights) (pop. 170,200)41
87.
Dubois County, IN (Jasper, Huntingburg, Ferdinand) (pop. 39,674)41
88.
Passaic County, NJ (Paterson, Clifton, Passaic) (pop. 489,049)41
89.
El Paso County, TX (El Paso, Socorro, San Elizario) (pop. 679,622)41
90.
Maricopa County, AZ (Phoenix, Mesa, Glendale) (pop. 3,072,149)41
91.
Washoe County, NV (Reno, Sparks, North Valleys) (pop. 339,486)41
92.
Waukesha County, WI (Waukesha, Brookfield, New Berlin) (pop. 360,767)41
93.
Johnson County, IA (Iowa City, Coralville, North Liberty) (pop. 111,006)41
94.
Erie County, PA (Erie, Northwest Harborcreek, Edinboro) (pop. 280,843)41
95.
Pierce County, WA (Tacoma, Lakewood, Graham-Thrift) (pop. 700,820)41
96.
New Haven County, CT (New Haven, Waterbury, Meriden) (pop. 824,008)41
97.
Cabell County, WV (Huntington, Pea Ridge, Barboursville) (pop. 96,784)41
98.
Essex County, NJ (Newark, East Orange, Irvington) (pop. 793,633)40
99.
Dauphin County, PA (Harrisburg, Colonial Park, Hershey) (pop. 251,798)40
100.
Madison County, AL (Huntsville, Madison, Madison Crossroads) (pop. 276,700)40
101.
Greene County, OH (Beavercreek, Fairborn, Xenia) (pop. 147,886)40
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