Top 101 counties with the highest Particulate Matter (PM10) 24-hour air pollution readings in 2005 (µg/m3)

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Value distibution for all U.S. cities

RankCityValue
1.
Inyo County, CA (Bishop, West Bishop, Dixon Lane-Meadow Creek) (pop. 17,945)3,538
2.
Mono County, CA (Mammoth Lakes, Crowley Lake, Walker) (pop. 12,853)1,245
3.
Benton County, WA (Kennewick, Richland, Northwest Benton) (pop. 142,475)268
4.
Sweetwater County, WY (Rock Springs, Green River, North Rock Springs) (pop. 37,613)230
5.
El Paso County, TX (El Paso, Socorro, San Elizario) (pop. 679,622)208
6.
Santa Cruz County, AZ (Nogales, Rio Rico, Rio Rico Northeast) (pop. 38,381)205
7.
Dona Ana County, NM (Las Cruces, Dona Ana-Hill, South Dona Ana) (pop. 174,682)205
8.
Nassau County, FL (Fernandina Beach, Yulee, Nassau Village-Ratliff) (pop. 57,663)204
9.
Maricopa County, AZ (Phoenix, Mesa, Glendale) (pop. 3,072,149)200
10.
St. Louis city, MO (St. Louis) (pop. 348,189)196
11.
Lake County, IN (Gary, Hammond, East Chicago) (pop. 484,564)183
12.
Jefferson County, AL (Birmingham, Hoover, Bessemer) (pop. 662,047)179
13.
Pinal County, AZ (San Tan Valley, North Pinal, Apache Junction) (pop. 179,727)172
14.
Imperial County, CA (El Centro, Calexico, Brawley) (pop. 142,361)169
15.
Campbell County, WY (Gillette, Antelope Valley-Crestview, Wright) (pop. 33,698)167
16.
Sandoval County, NM (Santo Domingo, Corrales, Bernalillo) (pop. 89,908)162
17.
Georgetown County, SC (Waccamaw, Georgetown, Murrells Inlet) (pop. 55,797)157
18.
San Diego County, CA (San Diego, Chula Vista, Oceanside) (pop. 2,813,833)154
19.
Scioto County, OH (Portsmouth, Wheelersburg, West Portsmouth) (pop. 79,195)152
20.
Scott County, IA (Davenport, Bettendorf, Eldridge) (pop. 158,668)151
21.
Cerro Gordo County, IA (Mason City, Clear Lake, Rockwell) (pop. 46,447)149
22.
Pennington County, SD (Rapid City, Rapid Valley, Box Elder) (pop. 88,565)147
23.
Gunnison County, CO (Gunnison, Crested Butte, Mount Crested Butte) (pop. 13,956)145
24.
Anchorage Municipality, AK (Anchorage) (pop. 260,283)145
25.
Clark County, NV (Las Vegas, Paradise, Henderson) (pop. 1,375,765)142
26.
Spokane County, WA (Spokane, Spokane Valley, Opportunity) (pop. 417,939)142
27.
Allegheny County, PA (Pittsburgh, Penn Hills, Bethel Park) (pop. 1,281,666)142
28.
Washoe County, NV (Reno, Sparks, North Valleys) (pop. 339,486)142
29.
Alamosa County, CO (Alamosa, Alamosa East, Mosca-Hooper) (pop. 14,966)141
30.
Northampton County, PA (Bethlehem, Easton, Northampton) (pop. 267,066)139
31.
Cameron County, TX (Brownsville, Harlingen, San Benito) (pop. 335,227)139
32.
Bernalillo County, NM (Albuquerque, Rio Rancho, South Valley) (pop. 556,678)137
33.
Harris County, TX (Houston, Northwest Harris, Pasadena) (pop. 3,400,578)137
34.
Power County, ID (American Falls, Arbon Valley, Rockland) (pop. 7,538)134
35.
Porter County, IN (Portage, Valparaiso, Chesterton) (pop. 146,798)133
36.
Wayne County, MI (Detroit, Livonia, Dearborn) (pop. 2,061,162)132
37.
Jasper County, MO (Joplin, Carthage, Webb City) (pop. 104,686)130
38.
Lexington County, SC (Seven Oaks, West Columbia, Cayce) (pop. 216,014)128
39.
Pottawattamie County, IA (Council Bluffs, Carter Lake, Avoca) (pop. 87,704)123
40.
Douglas County, NE (Omaha, Ralston, Elkhorn) (pop. 463,585)123
41.
Salt Lake County, UT (Salt Lake City, West Valley City, Sandy) (pop. 898,387)123
42.
Maui County, HI (Kahului, Kihei, Wailuku) (pop. 128,094)119
43.
Walla Walla County, WA (Walla Walla, College Place, Burbank) (pop. 55,180)116
44.
Pitkin County, CO (Aspen, Snowmass Village, Woody Creek) (pop. 14,872)116
45.
Cuyahoga County, OH (Cleveland, Parma, Lakewood) (pop. 1,393,978)115
46.
Converse County, WY (Douglas, Glenrock, Rolling Hills) (pop. 12,052)114
47.
Kings County, CA (Hanford, Lemoore, Avenal) (pop. 129,461)113
48.
San Bernardino County, CA (San Bernardino, Ontario, Fontana) (pop. 1,709,434)111
49.
Matanuska-Susitna Borough, AK (Knik-Fairview, Lakes, Wasilla) (pop. 59,322)111
50.
Prowers County, CO (Lamar, Holly, Granada) (pop. 14,483)110
51.
Nevada County, CA (Donner, Truckee, Grass Valley) (pop. 92,033)110
52.
Stevens County, WA (Loon Lake, Colville, Chewelah) (pop. 40,066)109
53.
Madison County, IL (Granite City, Alton, Collinsville) (pop. 258,941)107
54.
Dawson County, NE (Lexington, Cozad, Gothenburg) (pop. 24,365)106
55.
Riverside County, CA (Riverside, Perris Valley, Moreno Valley) (pop. 1,545,387)106
56.
Summit County, CO (Silverthorne, Frisco, Breckenridge) (pop. 23,548)105
57.
Flathead County, MT (Kalispell, Creston-Bigfork, Evergreen) (pop. 74,471)104
58.
Mesa County, CO (Grand Junction, Clifton, Redlands) (pop. 116,255)104
59.
Sheridan County, WY (Sheridan, Story, Ranchester) (pop. 26,560)104
60.
Kern County, CA (Bakersfield, East Kern, Delano) (pop. 661,645)102
61.
Kay County, OK (Ponca City, Blackwell, Tonkawa) (pop. 48,080)101
62.
Tulare County, CA (Visalia, Tulare, Porterville) (pop. 368,021)100
63.
Honolulu County, HI (Honolulu, Urban Honolulu, Ewa) (pop. 876,156)99
64.
Hancock County, WV (Weirton, Chester, Newell) (pop. 32,667)99
65.
Lincoln County, MT (Libby, Eureka, Pioneer Junction) (pop. 18,837)99
66.
Manatee County, FL (Bradenton, South Bradenton, Myakka) (pop. 264,002)99
67.
Adams County, CO (Aurora, West Adams, Westminster) (pop. 363,857)97
68.
Union County, TN (Sharps Chapel, Plainview, Maynardville) (pop. 17,808)96
69.
Webb County, TX (Laredo, Bruni-Mirando, Webb) (pop. 193,117)95
70.
Canyon County, ID (Nampa, Caldwell, Huston) (pop. 131,441)94
71.
Cass County, NE (Plattsmouth, Eagle, Weeping Water) (pop. 24,334)93
72.
Muskogee County, OK (Muskogee, Fort Gibson, Haskell) (pop. 69,451)93
73.
Whitley County, IN (Columbia City, Tri-Lakes, South Whitley) (pop. 30,707)92
74.
Fresno County, CA (Fresno, Clovis, Reedley) (pop. 799,407)92
75.
St. Joseph County, IN (South Bend, Mishawaka, Granger) (pop. 265,559)89
76.
Weber County, UT (Ogden, Roy, North Ogden) (pop. 196,533)89
77.
Pima County, AZ (Tucson, Casas Adobes, Catalina Foothills) (pop. 843,746)88
78.
Cache County, UT (Logan, Smithfield, Hyrum) (pop. 91,391)88
79.
Cook County, IL (Chicago, Cicero, Arlington Heights) (pop. 5,376,741)88
80.
Ada County, ID (Boise, Meridian, Orchard) (pop. 300,904)88
81.
Yuma County, AZ (Yuma, Fortuna Foothills, San Luis) (pop. 160,026)86
82.
Shoshone County, ID (Kellogg, Pinehurst, Osburn) (pop. 13,771)85
83.
Franklin County, OH (Columbus, Westerville, Upper Arlington) (pop. 1,068,978)85
84.
Richland County, SC (Columbia, Dutch Fork, Pontiac) (pop. 320,677)83
85.
Routt County, CO (Steamboat Springs, Hayden, Oak Creek) (pop. 19,690)83
86.
Cochise County, AZ (Sierra Vista, Sierra Vista Southeast, Douglas) (pop. 117,755)82
87.
Colusa County, CA (Central Colusa, East Colusa, Colusa) (pop. 18,804)82
88.
Lake County, MT (Polson, Big Fork-Swan River, Pablo) (pop. 26,507)82
89.
Stanislaus County, CA (Modesto, Turlock, Ceres) (pop. 446,997)81
90.
Frederick County, VA (Winchester, Lake Holiday, Shawneeland) (pop. 59,209)81
91.
Cumberland County, ME (Portland, South Portland, Westbrook) (pop. 265,612)81
92.
La Salle County, IL (Ottawa, Streator, Peru) (pop. 111,509)81
93.
McMinn County, TN (Athens, Calhoun-Riceville, Etowah) (pop. 49,015)80
94.
Bradley County, TN (Cleveland, West Bradley, Southeast Bradley) (pop. 87,965)80
95.
Rosebud County, MT (Rosebud, North of the Yellowstone, Colstrip) (pop. 9,383)80
96.
Clinton County, IA (Clinton, De Witt, Camanche) (pop. 50,149)80
97.
Lake County, OR (Lakeview, Silver Lake-Fort Rock, Summer Lake) (pop. 7,422)80
98.
Muscatine County, IA (Muscatine, West Liberty, Wilton) (pop. 41,722)80
99.
Los Angeles County, CA (Los Angeles, East San Gabriel Valley, Long Beach) (pop. 9,519,338)79
100.
Hamilton County, FL (Jasper, Jennings, White Springs) (pop. 13,327)78
101.
Camden County, NJ (Camden, Pennsauken, Lindenwold) (pop. 508,932)78
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