Top 101 counties with the lowest 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.
Converse County, WY (Douglas, Glenrock, Rolling Hills) (pop. 12,052)7
2.
Laramie County, WY (Cheyenne, Ranchettes, Warren AFB) (pop. 81,607)9
3.
Santa Fe County, NM (Santa Fe, Eldorado at Santa Fe, La Cienega) (pop. 129,292)9
4.
San Juan County, NM (Farmington, Shiprock, Simpson-Chaco) (pop. 113,801)11
5.
Lake County, CA (Clearlake, Lakeport, Hidden Valley Lake) (pop. 58,309)11
6.
Billings County, ND (Medora) (pop. 888)11
7.
Jackson County, SD (Kadoka, Wanblee, Interior) (pop. 2,930)11
8.
Honolulu County, HI (Honolulu, Urban Honolulu, Ewa) (pop. 876,156)11
9.
Grant County, NM (Silver City, Bayard-Santa Rita, Bayard) (pop. 31,002)12
10.
Burke County, ND (Bowbells, Powers Lake, Lignite) (pop. 2,242)12
11.
McKenzie County, ND (Watford City, Mandaree, Four Bears Village) (pop. 5,737)12
12.
Campbell County, WY (Gillette, Antelope Valley-Crestview, Wright) (pop. 33,698)12
13.
Custer County, SD (Custer, Hermosa, Buffalo Gap) (pop. 7,275)13
14.
Pueblo County, CO (Pueblo, Pueblo West, St. Charles Mesa) (pop. 141,472)13
15.
Elbert County, CO (Ponderosa Park, Elizabeth, Simla) (pop. 19,872)13
16.
Scotts Bluff County, NE (Scottsbluff, Gering, Mitchell) (pop. 36,951)13
17.
Coconino County, AZ (Coconino, Flagstaff, Sedona) (pop. 116,320)13
18.
Pima County, AZ (Tucson, Casas Adobes, Catalina Foothills) (pop. 843,746)14
19.
Monterey County, CA (Salinas, Seaside, Monterey) (pop. 401,762)14
20.
Sandoval County, NM (Santo Domingo, Corrales, Bernalillo) (pop. 89,908)15
21.
Sanders County, MT (Thompson Falls, Plains, Hot Springs) (pop. 10,227)15
22.
Mendocino County, CA (Ukiah, Redwood-Potter, Fort Bragg) (pop. 86,265)15
23.
Nevada County, CA (Donner, Truckee, Grass Valley) (pop. 92,033)16
24.
Colusa County, CA (Central Colusa, East Colusa, Colusa) (pop. 18,804)16
25.
Larimer County, CO (Fort Collins, Loveland, Estes Park) (pop. 251,494)16
26.
Cochise County, AZ (Sierra Vista, Sierra Vista Southeast, Douglas) (pop. 117,755)16
27.
Chaves County, NM (Roswell, Southwest Chaves, Northwest Chaves) (pop. 61,382)17
28.
Pinal County, AZ (San Tan Valley, North Pinal, Apache Junction) (pop. 179,727)17
29.
Burleigh County, ND (Bismarck, Lincoln, Wing) (pop. 69,416)17
30.
El Paso County, CO (Colorado Springs, Black Forest-Peyton, Security-Widefield) (pop. 516,929)17
31.
San Luis Obispo County, CA (San Luis Obispo, Paso Robles, Atascadero) (pop. 246,681)17
32.
Lea County, NM (Hobbs, Lovington, North Hobbs) (pop. 55,511)18
33.
Cascade County, MT (Great Falls, Malmstrom AFB, Sun River Valley) (pop. 80,357)18
34.
Anchorage Municipality, AK (Anchorage) (pop. 260,283)18
35.
Mesa County, CO (Grand Junction, Clifton, Redlands) (pop. 116,255)18
36.
Pennington County, SD (Rapid City, Rapid Valley, Box Elder) (pop. 88,565)18
37.
Boulder County, CO (Boulder, Longmont, Lafayette) (pop. 291,288)18
38.
Brevard County, FL (Palm Bay, Melbourne, Titusville) (pop. 476,230)18
39.
Calaveras County, CA (West Point-Wilseyville, Arnold, Rancho Calaveras) (pop. 40,554)18
40.
Bernalillo County, NM (Albuquerque, Rio Rancho, South Valley) (pop. 556,678)19
41.
St. Lucie County, FL (Port St. Lucie, Fort Pierce, Lakewood Park) (pop. 192,695)19
42.
Vilas County, WI (Arbor Vitae, Lincoln, St. Germain) (pop. 21,033)19
43.
Mercer County, ND (Beulah, Hazen, Stanton) (pop. 8,644)19
44.
Shasta County, CA (Redding, Central Shasta, Anderson) (pop. 163,256)19
45.
Belknap County, NH (Laconia, Gilford, Belmont) (pop. 56,325)19
46.
Lee County, FL (Cape Coral, Fort Myers, North Fort Myers) (pop. 440,888)19
47.
Ector County, TX (Odessa, Goldsmith-Penwell, West Odessa) (pop. 121,123)20
48.
Miami-Dade County, FL (Miami, Kendale Lakes-Lindgren Acres, Hialeah) (pop. 2,253,362)20
49.
Sarasota County, FL (Sarasota, Interior County, Gulf Gate-Osprey) (pop. 325,957)20
50.
Manatee County, FL (Bradenton, South Bradenton, Myakka) (pop. 264,002)21
51.
Weld County, CO (Greeley, Windsor, Evans) (pop. 180,936)21
52.
Yellowstone County, MT (Billings, South Yellowstone, Laurel) (pop. 129,352)21
53.
Ashland County, WI (Ashland, Sanborn, White River) (pop. 16,866)21
54.
Polk County, FL (Lakeland, Winter Haven, Bartow) (pop. 483,924)22
55.
Imperial County, CA (El Centro, Calexico, Brawley) (pop. 142,361)22
56.
Brown County, SD (Aberdeen, Groton, Warner) (pop. 35,460)22
57.
Arapahoe County, CO (South Aurora, Southwest Arapahoe, Centennial) (pop. 487,967)22
58.
Adams County, CO (Aurora, West Adams, Westminster) (pop. 363,857)22
59.
Citrus County, FL (Homosassa Springs, Beverly Hills, Hernando) (pop. 118,085)22
60.
Flathead County, MT (Kalispell, Creston-Bigfork, Evergreen) (pop. 74,471)22
61.
Aroostook County, ME (Presque Isle, Caribou, Houlton) (pop. 73,938)23
62.
Hall County, NE (Grand Island, Wood River, Cairo) (pop. 53,534)23
63.
Seminole County, FL (Altamonte Springs, Sanford, Winter Springs) (pop. 365,196)23
64.
Volusia County, FL (Deltona, Daytona Beach, Port Orange) (pop. 443,343)23
65.
Cass County, ND (Fargo, West Fargo, Casselton) (pop. 123,138)23
66.
Brookings County, SD (Brookings, Volga, Elkton) (pop. 28,220)24
67.
Washington County, NE (Blair, Arlington, Fort Calhoun) (pop. 18,780)24
68.
Yolo County, CA (Davis, Woodland, East Yolo) (pop. 168,660)24
69.
Merrimack County, NH (Concord, Franklin, Bow) (pop. 136,225)24
70.
Alachua County, FL (Gainesville, Alachua, High Springs) (pop. 217,955)25
71.
Litchfield County, CT (Torrington, Watertown, Plymouth) (pop. 182,193)25
72.
Stearns County, MN (St. Cloud, Sartell, Waite Park) (pop. 133,166)25
73.
Martin County, NC (Williamston, Robersonville, Hamilton) (pop. 25,593)25
74.
Matanuska-Susitna Borough, AK (Knik-Fairview, Lakes, Wasilla) (pop. 59,322)25
75.
Marion County, FL (Ocala, East Marion, Fellowship) (pop. 258,916)25
76.
New Hanover County, NC (Wilmington, Masonboro, Kings Grant) (pop. 160,307)25
77.
Chippewa County, MI (Sault Ste. Marie, De Tour Village) (pop. 38,543)25
78.
Rockingham County, NH (Salem, Derry, Portsmouth) (pop. 277,359)25
79.
Pinellas County, FL (St. Petersburg, Clearwater, Boca Ciega) (pop. 921,482)25
80.
St. Louis County, MN (Duluth, Hibbing, Virginia) (pop. 200,528)25
81.
Woodbury County, IA (Sioux City, Sergeant Bluff, Moville) (pop. 103,877)25
82.
Box Elder County, UT (Brigham City, Tremonton, Perry) (pop. 42,745)26
83.
Oxford County, ME (Rumford, Paris, Norway) (pop. 54,755)26
84.
Minnehaha County, SD (Sioux Falls, Brandon, Dell Rapids) (pop. 148,281)26
85.
Ventura County, CA (Oxnard, Thousand Oaks, Simi Valley) (pop. 753,197)26
86.
Cass County, NE (Plattsmouth, Eagle, Weeping Water) (pop. 24,334)26
87.
Codington County, SD (Watertown, Florence, South Shore) (pop. 25,897)26
88.
Hidalgo County, TX (McAllen, Southeast Hidalgo, Edinburg) (pop. 569,463)26
89.
Orange County, FL (Orlando, Southwest Orange, Alafaya) (pop. 896,344)26
90.
Caddo County, OK (Anadarko, Hinton, Carnegie) (pop. 30,150)26
91.
Coos County, NH (Berlin, Northumberland, Colebrook) (pop. 33,111)26
92.
Sumner County, KS (Wellington, Mulvane, Belle Plaine) (pop. 25,946)26
93.
Tarrant County, TX (Fort Worth, Northeast Tarrant, Arlington) (pop. 1,446,219)26
94.
Hillsborough County, FL (Tampa, Citrus Park-Fern Lake, Brandon) (pop. 998,948)26
95.
Glynn County, GA (Brunswick, Everett, St. Simons) (pop. 67,568)26
96.
Multnomah County, OR (Portland, Gresham, Troutdale) (pop. 660,486)26
97.
Ada County, ID (Boise, Meridian, Orchard) (pop. 300,904)26
98.
Essex County, NY (North Elba, Ticonderoga, Moriah) (pop. 38,851)27
99.
Denver County, CO (Denver, Holly Hills) (pop. 554,636)27
100.
Duval County, FL (Jacksonville, Jacksonville Beach, Atlantic Beach) (pop. 778,879)27
101.
Wright County, IA (Eagle Grove, Clarion, Belmond) (pop. 14,334)27
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