Top 101 counties with the lowest 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.
McCone County, MT (North McCone, Circle) (pop. 1,977)17
2.
Sanders County, MT (Thompson Falls, Plains, Hot Springs) (pop. 10,227)21
3.
Cascade County, MT (Great Falls, Malmstrom AFB, Sun River Valley) (pop. 80,357)21
4.
Sweet Grass County, MT (South of the Yellowstone, Big Timber, Greycliff) (pop. 3,609)23
5.
Navajo County, AZ (Little Colorado, Apache, Western) (pop. 97,470)25
6.
Washington County, OR (Beaverton, Hillsboro, Somerset West-Rock Creek) (pop. 445,342)25
7.
Custer County, SD (Custer, Hermosa, Buffalo Gap) (pop. 7,275)26
8.
Siskiyou County, CA (Yreka, Mount Shasta, Weed) (pop. 44,301)27
9.
San Juan County, NM (Farmington, Shiprock, Simpson-Chaco) (pop. 113,801)27
10.
Calaveras County, CA (West Point-Wilseyville, Arnold, Rancho Calaveras) (pop. 40,554)27
11.
Kauai County, HI (Kapaa, Lihue, Wailua Homesteads) (pop. 58,463)28
12.
Burleigh County, ND (Bismarck, Lincoln, Wing) (pop. 69,416)28
13.
McKenzie County, ND (Watford City, Mandaree, Four Bears Village) (pop. 5,737)29
14.
Clark County, WA (Vancouver, Hazel Dell, Orchards) (pop. 345,238)30
15.
Yavapai County, AZ (Prescott, Verde, Mingus Mountain) (pop. 167,517)31
16.
Marin County, CA (Ross Valley, San Rafael, Northeast Marin) (pop. 247,289)31
17.
Chaves County, NM (Roswell, Southwest Chaves, Northwest Chaves) (pop. 61,382)31
18.
Onslow County, NC (Jacksonville, Piney Green, Half Moon) (pop. 150,355)31
19.
Grant County, NM (Silver City, Bayard-Santa Rita, Bayard) (pop. 31,002)32
20.
Fremont County, CO (Canon City, Penrose-Portland, Penrose) (pop. 46,145)32
21.
Barnwell County, SC (Barnwell, Williston, Blackville) (pop. 23,478)32
22.
Hampshire County, MA (Amherst, Northampton, South Hadley) (pop. 152,251)33
23.
Travis County, TX (Austin, Pflugerville, Wells Branch) (pop. 812,280)33
24.
Carroll County, VA (Hillsville, Woodlawn, Cana) (pop. 29,245)33
25.
Laramie County, WY (Cheyenne, Ranchettes, Warren AFB) (pop. 81,607)34
26.
Escambia County, AL (Atmore, East Escambia, Brewton) (pop. 38,440)34
27.
Orange County, FL (Orlando, Southwest Orange, Alafaya) (pop. 896,344)34
28.
Henderson County, NC (Hendersonville, Mills River, Fletcher) (pop. 89,173)34
29.
Gallatin County, MT (Bozeman, Belgrade, Gallatin Gateway) (pop. 67,831)34
30.
Burke County, ND (Bowbells, Powers Lake, Lignite) (pop. 2,242)34
31.
San Benito County, CA (Hollister, Aromas, Ridgemark) (pop. 53,234)35
32.
Coconino County, AZ (Coconino, Flagstaff, Sedona) (pop. 116,320)35
33.
Juneau City and Borough, AK (Juneau) (pop. 30,711)35
34.
Monroe County, MO (Paris, Madison, Holliday) (pop. 9,311)35
35.
Guilford County, NC (Greensboro, High Point, Summerfield) (pop. 421,048)35
36.
Warren County, VA (Front Royal, Shenandoah Farms, Apple Mountain Lake) (pop. 31,584)35
37.
Natrona County, WY (Casper, Hells Half Acre, Mills) (pop. 66,533)35
38.
Harrison County, TX (Marshall, Harleton, Hallsville) (pop. 62,110)35
39.
Kennebec County, ME (Augusta, Waterville, Winslow) (pop. 117,114)35
40.
Sonoma County, CA (Santa Rosa, Petaluma, Rohnert Park) (pop. 458,614)35
41.
Chesterfield County, SC (Cheraw, Pageland, Chesterfield) (pop. 42,768)36
42.
Santa Fe County, NM (Santa Fe, Eldorado at Santa Fe, La Cienega) (pop. 129,292)36
43.
Delaware County, IA (Manchester, Earlville, Hopkinton) (pop. 18,404)36
44.
Durham County, NC (Durham, Gorman, Rougemont) (pop. 223,314)36
45.
Culpeper County, VA (Culpeper) (pop. 34,262)36
46.
Alameda County, CA (Oakland, Fremont, Hayward) (pop. 1,443,741)37
47.
Norfolk city, VA (Norfolk) (pop. 234,403)37
48.
Josephine County, OR (Grants Pass, Northwest Josephine, Redwood) (pop. 75,726)37
49.
Umatilla County, OR (Northwest Umatilla, Pendleton, Hermiston) (pop. 70,548)37
50.
Swain County, NC (Cherokee, Bryson City) (pop. 12,968)37
51.
Napa County, CA (Napa, American Canyon, St. Helena) (pop. 124,279)37
52.
Jackson County, SD (Kadoka, Wanblee, Interior) (pop. 2,930)37
53.
Monterey County, CA (Salinas, Seaside, Monterey) (pop. 401,762)38
54.
Fredericksburg city, VA (Fredericksburg) (pop. 19,279)38
55.
Boulder County, CO (Boulder, Longmont, Lafayette) (pop. 291,288)38
56.
El Dorado County, CA (South El Dorado, North El Dorado, South Lake Tahoe) (pop. 156,299)38
57.
Rockingham County, NH (Salem, Derry, Portsmouth) (pop. 277,359)38
58.
Aiken County, SC (Aiken, North Augusta, Beech Island) (pop. 142,552)38
59.
Fairfax County, VA (Burke, Reston, Annandale) (pop. 969,749)38
60.
Kent County, RI (Warwick, Coventry, West Warwick) (pop. 167,090)38
61.
Catawba County, NC (Hickory, Newton, St. Stephens) (pop. 141,685)38
62.
Glynn County, GA (Brunswick, Everett, St. Simons) (pop. 67,568)39
63.
Laurel County, KY (Keavy, London, Bush) (pop. 52,715)39
64.
Escambia County, FL (Pensacola, Cantonment, Ferry Pass) (pop. 294,410)39
65.
Lycoming County, PA (Williamsport, South Williamsport, Montoursville) (pop. 120,044)39
66.
Charlottesville city, VA (Charlottesville) (pop. 45,049)39
67.
Rockingham County, VA (Harrisonburg, Bridgewater, Massanetta Springs) (pop. 67,725)40
68.
Tehama County, CA (Red Bluff, Corning, West Tehama) (pop. 56,039)40
69.
Placer County, CA (Roseville, Loomis Basin-Folsom Lake, Rocklin) (pop. 248,399)40
70.
Montgomery County, AL (Montgomery, Hope Hull, Mount Meigs) (pop. 223,510)40
71.
Pulaski County, KY (Somerset, Nancy, Shopville) (pop. 56,217)40
72.
Winchester city, VA (pop. 23,585)40
73.
Vilas County, WI (Arbor Vitae, Lincoln, St. Germain) (pop. 21,033)41
74.
Shasta County, CA (Redding, Central Shasta, Anderson) (pop. 163,256)41
75.
Chattooga County, GA (Summerville, Little Sand Mountain, Trion) (pop. 25,470)41
76.
Fairfield County, CT (Bridgeport, Stamford, Norwalk) (pop. 882,567)41
77.
Galveston County, TX (Galveston, League City, Texas City) (pop. 250,158)41
78.
Douglas County, WI (Superior, Parkland, Amnicon) (pop. 43,287)41
79.
Wayne County, NC (Goldsboro, Mount Olive, Elroy) (pop. 113,329)41
80.
Dunn County, ND (Killdeer, Halliday, Dodge) (pop. 3,600)41
81.
Spartanburg County, SC (Spartanburg, Pauline, Fairmont Mills) (pop. 253,791)41
82.
Madison County, KY (Richmond, Berea, Cottonburg-Valley View) (pop. 70,872)41
83.
Allen County, OH (Lima, Delphos, Bluffton) (pop. 108,473)42
84.
Jackson County, IL (Carbondale, Murphysboro, De Soto) (pop. 59,612)42
85.
Madison County, TN (Jackson, Spring Creek-Beech Bluff, Pope) (pop. 91,837)42
86.
Cumberland County, NC (Fayetteville, Fort Bragg, Hope Mills) (pop. 302,963)42
87.
Bell County, KY (Middlesborough, Kentucky Ridge, Pineville) (pop. 30,060)42
88.
Hancock County, OH (Findlay, McComb, Arlington) (pop. 71,295)42
89.
Contra Costa County, CA (Central Contra Costa, West Contra Costa, Concord) (pop. 948,816)43
90.
Shawnee County, KS (Topeka, Silver Lake, Auburn) (pop. 169,871)43
91.
San Francisco County, CA (San Francisco) (pop. 776,733)43
92.
Tarrant County, TX (Fort Worth, Northeast Tarrant, Arlington) (pop. 1,446,219)43
93.
Caddo Parish, LA (Shreveport, Vivian, Greenwood) (pop. 252,161)43
94.
Douglas County, GA (Bill Arp, Douglasville, Winston) (pop. 92,174)43
95.
Park County, WY (Cody, Powell, Yellowstone National Park) (pop. 25,786)44
96.
New Haven County, CT (New Haven, Waterbury, Meriden) (pop. 824,008)44
97.
Pierce County, WA (Tacoma, Lakewood, Graham-Thrift) (pop. 700,820)44
98.
Meade County, SD (Sturgis, Ellsworth AFB, Blackhawk) (pop. 24,253)44
99.
Pittsburg County, OK (McAlester, Twin Cities, North Central Pittsburg) (pop. 43,953)44
100.
Mendocino County, CA (Ukiah, Redwood-Potter, Fort Bragg) (pop. 86,265)44
101.
Roane County, TN (Harriman, Barnard, Rockwood) (pop. 51,910)44
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