Top 101 counties with the lowest carbon monoxide air pollution readings in 2005 (ppm)

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Value distibution for all U.S. cities

RankCityValue
1.
Adams County, PA (Gettysburg, Littlestown, Carroll Valley) (pop. 91,292)0
2.
Hancock County, ME (Ellsworth, Bucksport, Bar Harbor) (pop. 51,791)0
3.
Kay County, OK (Ponca City, Blackwell, Tonkawa) (pop. 48,080)0
4.
Dakota County, MN (Eagan, Burnsville, Apple Valley) (pop. 355,904)0
5.
Schoolcraft County, MI (Manistique) (pop. 8,903)0
6.
Cherokee County, OK (Tahlequah, South Cherokee, East Cherokee) (pop. 42,521)0
7.
Santa Fe County, NM (Santa Fe, Eldorado at Santa Fe, La Cienega) (pop. 129,292)1
8.
St. Louis County, MO (Florissant, Chesterfield, University City) (pop. 1,016,315)1
9.
Lake County, OH (Mentor, Willoughby, Eastlake) (pop. 227,511)1
10.
Schuylkill County, PA (Pottsville, Tamaqua, Shenandoah) (pop. 150,336)1
11.
Erie County, PA (Erie, Northwest Harborcreek, Edinboro) (pop. 280,843)1
12.
Albany County, NY (Albany, Guilderland, Bethlehem) (pop. 294,565)1
13.
Teton County, WY (Jackson Hole, Jackson, Hoback) (pop. 18,251)1
14.
Blair County, PA (Altoona, Tyrone, Hollidaysburg) (pop. 129,144)1
15.
Jefferson County, TX (East Jefferson, Beaumont, Port Arthur) (pop. 252,051)1
16.
York County, PA (York, Hanover, Shiloh) (pop. 381,751)1
17.
Sullivan County, TN (Kingsport, Bristol, Bluff City-Piney Flats) (pop. 153,048)1
18.
Charleston County, SC (Charleston, North Charleston, Mount Pleasant) (pop. 309,969)1
19.
Sandoval County, NM (Santo Domingo, Corrales, Bernalillo) (pop. 89,908)1
20.
Westmoreland County, PA (Murrysville, Municipality of Murrysville, Greensburg) (pop. 369,993)1
21.
Tulsa County, OK (Tulsa, Broken Arrow, Owasso) (pop. 563,299)1
22.
Cambria County, PA (Johnstown, Westmont, Northern Cambria) (pop. 152,598)1
23.
Comanche County, OK (Lawton, Southeast Comanche, Sill) (pop. 114,996)1
24.
Washington County, PA (Washington, Canonsburg, Donora) (pop. 202,897)1
25.
Chittenden County, VT (Burlington, Essex, Colchester) (pop. 146,571)1
26.
Ottawa County, OK (Miami, Commerce, Picher) (pop. 33,194)1
27.
Dauphin County, PA (Harrisburg, Colonial Park, Hershey) (pop. 251,798)1
28.
Beaver County, PA (Aliquippa, Beaver Falls, Economy) (pop. 181,412)1
29.
Rowan County, NC (Salisbury, China Grove, Spencer) (pop. 130,340)1
30.
Gallatin County, MT (Bozeman, Belgrade, Gallatin Gateway) (pop. 67,831)1
31.
Durham County, NC (Durham, Gorman, Rougemont) (pop. 223,314)1
32.
Montgomery County, PA (Norristown, Pottstown, King of Prussia) (pop. 750,097)1
33.
Travis County, TX (Austin, Pflugerville, Wells Branch) (pop. 812,280)1
34.
Caswell County, NC (Yanceyville, Milton) (pop. 23,501)1
35.
Greene County, PA (Waynesburg, Fairdale, Nemacolin) (pop. 40,672)1
36.
Cumberland County, ME (Portland, South Portland, Westbrook) (pop. 265,612)1
37.
Linn County, IA (Cedar Rapids, Marion, Hiawatha) (pop. 191,701)1
38.
Hendricks County, IN (Plainfield, Brownsburg, Danville) (pop. 104,093)1
39.
Sangamon County, IL (Springfield, Chatham, Auburn) (pop. 188,951)1
40.
Paulding County, GA (Huntsville, Yorkville, Dallas) (pop. 81,678)1
41.
Yolo County, CA (Davis, Woodland, East Yolo) (pop. 168,660)1
42.
Calaveras County, CA (West Point-Wilseyville, Arnold, Rancho Calaveras) (pop. 40,554)1
43.
El Dorado County, CA (South El Dorado, North El Dorado, South Lake Tahoe) (pop. 156,299)1
44.
Tuolumne County, CA (East Sonora-Phoenix Lake, Phoenix Lake-Cedar Ridge, Groveland) (pop. 54,501)1
45.
Santa Cruz County, CA (Santa Cruz, Watsonville, San Lorenzo Valley) (pop. 255,602)1
46.
Amador County, CA (Pine Grove-Silver Lake, Ione, Jackson) (pop. 35,100)1
47.
Monterey County, CA (Salinas, Seaside, Monterey) (pop. 401,762)1
48.
San Luis Obispo County, CA (San Luis Obispo, Paso Robles, Atascadero) (pop. 246,681)1
49.
Mariposa County, CA (Coulterville, Yosemite, Bootjack) (pop. 17,130)1
50.
Placer County, CA (Roseville, Loomis Basin-Folsom Lake, Rocklin) (pop. 248,399)1
51.
Bronx County, NY (Bronx) (pop. 1,332,650)2
52.
Schenectady County, NY (Schenectady, Glenville, Rotterdam) (pop. 146,555)2
53.
Oakland County, MI (Farmington Hills, Troy, Southfield) (pop. 1,194,156)2
54.
Niagara County, NY (Niagara Falls, North Tonawanda, Lockport) (pop. 219,846)2
55.
Cameron County, TX (Brownsville, Harlingen, San Benito) (pop. 335,227)2
56.
Kent County, MI (Grand Rapids, Wyoming, Kentwood) (pop. 574,335)2
57.
Oklahoma County, OK (Oklahoma City, Edmond, Midwest City) (pop. 660,448)2
58.
Roanoke city, VA (pop. 94,911)2
59.
St. Louis County, MN (Duluth, Hibbing, Virginia) (pop. 200,528)2
60.
Rutland County, VT (Rutland, Castleton, Pittsford) (pop. 63,400)2
61.
Lawrence County, PA (New Castle, Ellwood City, New Wilmington) (pop. 94,643)2
62.
Mecklenburg County, NC (Charlotte, Huntersville, Matthews) (pop. 695,454)2
63.
Stearns County, MN (St. Cloud, Sartell, Waite Park) (pop. 133,166)2
64.
Morris County, NJ (Morristown, Dover, Madison) (pop. 470,212)2
65.
Richland County, SC (Columbia, Dutch Fork, Pontiac) (pop. 320,677)2
66.
Richmond city, VA (Richmond) (pop. 197,790)2
67.
Monroe County, NY (Rochester, Irondequoit, Perinton) (pop. 735,343)2
68.
Guilford County, NC (Greensboro, High Point, Summerfield) (pop. 421,048)2
69.
Onondaga County, NY (Syracuse, Clay, Salina) (pop. 458,336)2
70.
Wake County, NC (Raleigh, Cary, Apex) (pop. 627,846)2
71.
Middlesex County, NJ (Edison, New Brunswick, Perth Amboy) (pop. 750,162)2
72.
Lancaster County, PA (Lancaster, Ephrata, Elizabethtown) (pop. 470,658)2
73.
Middlesex County, MA (Lowell, Cambridge, Newton) (pop. 1,465,396)2
74.
Greenville County, SC (Greenville, Wade Hampton, Taylors) (pop. 379,616)2
75.
Hamilton County, OH (Cincinnati, Norwood, Forest Park) (pop. 845,303)2
76.
Cascade County, MT (Great Falls, Malmstrom AFB, Sun River Valley) (pop. 80,357)2
77.
Lackawanna County, PA (Scranton, Dunmore, Carbondale) (pop. 213,295)2
78.
Allegheny County, PA (Pittsburgh, Penn Hills, Bethel Park) (pop. 1,281,666)2
79.
Hennepin County, MN (Minneapolis, Bloomington, Brooklyn Park) (pop. 1,116,200)2
80.
Hampton city, VA (Hampton) (pop. 146,437)2
81.
Northampton County, PA (Bethlehem, Easton, Northampton) (pop. 267,066)2
82.
Fairfax County, VA (Burke, Reston, Annandale) (pop. 969,749)2
83.
Arlington County, VA (Arlington) (pop. 189,453)2
84.
Luzerne County, PA (Wilkes-Barre, Back Mountain, Hazleton) (pop. 319,250)2
85.
Suffolk County, MA (Boston, Revere, Chelsea) (pop. 689,807)2
86.
Baltimore County, MD (Dundalk, Towson, Catonsville) (pop. 754,292)2
87.
Franklin County, OH (Columbus, Westerville, Upper Arlington) (pop. 1,068,978)2
88.
Berks County, PA (Reading, Wyomissing, Blandon) (pop. 373,638)2
89.
East Baton Rouge Parish, LA (Baton Rouge, Central, Shenandoah) (pop. 412,852)2
90.
Orleans Parish, LA (New Orleans) (pop. 484,674)2
91.
Linn County, KS (Pleasanton, La Cygne, Mound City) (pop. 9,570)2
92.
Monmouth County, NJ (Long Branch, Asbury Park, Tinton Falls) (pop. 615,301)2
93.
Polk County, IA (Des Moines, West Des Moines, Urbandale) (pop. 374,601)2
94.
Vanderburgh County, IN (Evansville, Melody Hill, Darmstadt) (pop. 171,922)2
95.
Marion County, IN (Indianapolis, Lawrence, Beech Grove) (pop. 860,454)2
96.
Lake County, IN (Gary, Hammond, East Chicago) (pop. 484,564)2
97.
Allen County, IN (Fort Wayne, New Haven, Leo-Cedarville) (pop. 331,849)2
98.
Dona Ana County, NM (Las Cruces, Dona Ana-Hill, South Dona Ana) (pop. 174,682)2
99.
Bucks County, PA (Levittown, Morrisville, Croydon) (pop. 597,635)2
100.
St. Clair County, IL (Belleville, East St. Louis, O'Fallon) (pop. 256,082)2
101.
Winnebago County, IL (Rockford, Machesney Park, Loves Park) (pop. 278,418)2
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