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Top 101 counties with the highest Ozone (1-hour) air pollution readings in 2005 (ppm)


1.  Los Angeles County, CA (Los Angeles, Long Beach, Glendale), pop. 9,519,338: 0.171
3.  Harris County, TX (Houston, Pasadena, Baytown), pop. 3,400,578: 0.156
4.  Fairfield County, CT (Bridgeport, Stamford, Norwalk), pop. 882,567: 0.146
5.  Riverside County, CA (Riverside, Moreno Valley, Corona), pop. 1,545,387: 0.142
6.  New Haven County, CT (New Haven, Waterbury, Meriden), pop. 824,008: 0.141
8.  Cecil County, MD (Elkton, Perryville, North East), pop. 85,951: 0.138
9.  Ocean County, NJ (Toms River, Lakewood, Point Pleasant), pop. 510,916: 0.137
11.  Middlesex County, CT (Middletown, East Hampton, Clinton), pop. 155,071: 0.134
12.  Kern County, CA (Bakersfield, Delano, Oildale), pop. 661,645: 0.131
13.  Mecklenburg County, NC (Charlotte, Huntersville, Matthews), pop. 695,454: 0.131
14.  Fresno County, CA (Fresno, Clovis, Reedley), pop. 799,407: 0.131
15.  Crittenden County, AR (West Memphis, Marion, Earle), pop. 50,866: 0.130
17.  Harford County, MD (Edgewood, Aberdeen, Joppatowne), pop. 218,590: 0.130
19.  Lake County, OH (Mentor, Willoughby, Eastlake), pop. 227,511: 0.129
20.  Milwaukee County, WI (Milwaukee, West Allis, Wauwatosa), pop. 940,164: 0.129
21.  Sacramento County, CA (Sacramento, Citrus Heights, Elk Grove), pop. 1,223,499: 0.129
22.  New Castle County, DE (Wilmington, Newark, Pike Creek), pop. 500,265: 0.128
23.  Philadelphia County, PA (Philadelphia), pop. 1,517,550: 0.128
24.  Parker County, TX (Weatherford, Willow Park, Reno), pop. 88,495: 0.127
25.  Hampden County, MA (Springfield, Chicopee, Westfield), pop. 456,228: 0.127
27.  Brazoria County, TX (Pearland, Lake Jackson, Alvin), pop. 241,767: 0.126
28.  El Paso County, TX (El Paso, Socorro, San Elizario), pop. 679,622: 0.125
29.  Middlesex County, NJ (Edison, New Brunswick, Perth Amboy), pop. 750,162: 0.125
30.  Montgomery County, TX (The Woodlands, Conroe, Pinehurst), pop. 293,768: 0.124
31.  Tolland County, CT (Vernon, Mansfield, Tolland), pop. 136,364: 0.124
32.  Fulton County, GA (Atlanta, Sandy Springs, Roswell), pop. 816,006: 0.124
33.  Suffolk County, NY (Brookhaven, Islip, Babylon), pop. 1,419,369: 0.124
36.  Tulare County, CA (Visalia, Tulare, Porterville), pop. 368,021: 0.123
37.  Allegan County, MI (Allegan, Wayland, Plainwell), pop. 105,665: 0.123
38.  Hampshire County, MA (Amherst, Northampton, South Hadley), pop. 152,251: 0.123
39.  Rowan County, NC (Salisbury, China Grove, Spencer), pop. 130,340: 0.123
41.  Ozaukee County, WI (Mequon, Cedarburg, Port Washington), pop. 82,317: 0.122
42.  Bucks County, PA (Levittown, Morrisville, Croydon), pop. 597,635: 0.121
43.  Imperial County, CA (El Centro, Calexico, Brawley), pop. 142,361: 0.121
44.  Davis County, UT (Layton, Bountiful, Clearfield), pop. 238,994: 0.121
45.  Bergen County, NJ (Hackensack, Teaneck, Fort Lee), pop. 884,118: 0.120
46.  Hudson County, NJ (Jersey City, Union City, Bayonne), pop. 608,975: 0.120
48.  Kenosha County, WI (Kenosha, Pleasant Prairie, Somers), pop. 149,577: 0.120
49.  Dallas County, TX (Dallas, Garland, Irving), pop. 2,218,899: 0.120
50.  Putnam County, NY (Carmel, Patterson, Putnam Valley), pop. 95,745: 0.119
51.  Nevada County, CA (Truckee, Grass Valley, Alta Sierra), pop. 92,033: 0.119
52.  Porter County, IN (Portage, Valparaiso, Chesterton), pop. 146,798: 0.119
54.  Placer County, CA (Roseville, Rocklin, Granite Bay), pop. 248,399: 0.119
55.  Sublette County, WY (Pinedale, Marbleton, Big Piney), pop. 5,920: 0.119
56.  Litchfield County, CT (Torrington, New Milford, Watertown), pop. 182,193: 0.119
57.  Delaware County, PA (Chester, Drexel Hill, Springfield), pop. 550,864: 0.119
58.  Kent County, RI (Warwick, Coventry, West Warwick), pop. 167,090: 0.118
59.  Queens County, NY, pop. 2,229,379: 0.118
60.  Racine County, WI (Racine, Caledonia, Mount Pleasant), pop. 188,831: 0.118
62.  Richmond County, NY (Concord, Bloomfield, Clifton), pop. 443,728: 0.117
63.  Denton County, TX (Denton, Lewisville, Flower Mound), pop. 432,976: 0.117
64.  Lake County, IN (Gary, Hammond, East Chicago), pop. 484,564: 0.116
65.  Clark County, NV (Las Vegas, Paradise, Henderson), pop. 1,375,765: 0.116
66.  St. Charles County, MO (St. Charles, St. Peters, O'Fallon), pop. 283,883: 0.116
67.  DeKalb County, GA (North Atlanta, Redan, Dunwoody), pop. 665,865: 0.116
68.  Macomb County, MI (Warren, Sterling Heights, Clinton), pop. 788,149: 0.116
69.  St. Louis city, MO, pop. 348,189: 0.116
70.  Essex County, MA (Lynn, Lawrence, Haverhill), pop. 723,419: 0.115
71.  Lucas County, OH (Toledo, Oregon, Sylvania), pop. 455,054: 0.115
72.  Maricopa County, AZ (Phoenix, Mesa, Glendale), pop. 3,072,149: 0.115
74.  Warren County, OH (Mason, Lebanon, Landen), pop. 158,383: 0.115
77.  Henry County, GA (Stockbridge, McDonough, Hampton), pop. 119,341: 0.115
78.  Gloucester County, NJ (Glassboro, Williamstown, Woodbury), pop. 254,673: 0.114
79.  Madison County, IL (Granite City, Alton, Collinsville), pop. 258,941: 0.114
80.  Door County, WI (Sturgeon Bay, Washington, Egg Harbor), pop. 27,961: 0.114
82.  Creek County, OK (Sapulpa, Bristow, Drumright), pop. 67,367: 0.114
83.  Manitowoc County, WI (Manitowoc, Two Rivers, Kiel), pop. 82,887: 0.114
84.  Orange County, FL (Orlando, Pine Hills, Apopka), pop. 896,344: 0.114
85.  Utah County, UT (Provo, Orem, Pleasant Grove), pop. 368,536: 0.114
86.  Alameda County, CA (Oakland, Fremont, Hayward), pop. 1,443,741: 0.113
87.  Camden County, NJ (Camden, Pennsauken, Lindenwold), pop. 508,932: 0.113
88.  Prince George's County, MD (Bowie, Chillum, Clinton), pop. 801,515: 0.113
89.  Richland County, SC (Columbia, St. Andrews, Dentsville), pop. 320,677: 0.113
90.  Pointe Coupee Parish, LA (New Roads, Livonia, Fordoche), pop. 22,763: 0.113
91.  Pinal County, AZ (Apache Junction, Casa Grande, Florence), pop. 179,727: 0.113
92.  Cook County, IL (Chicago, Cicero, Arlington Heights), pop. 5,376,741: 0.113
93.  Dukes County, MA (Edgartown, Oak Bluffs, West Tisbury), pop. 14,987: 0.113
94.  Lincoln County, MO (Troy, Elsberry, Moscow Mills), pop. 38,944: 0.113
95.  Kings County, CA (Hanford, Lemoore, Avenal), pop. 129,461: 0.112
96.  Providence County, RI (Providence, Cranston, Pawtucket), pop. 621,602: 0.112
97.  Ventura County, CA (Oxnard, Thousand Oaks, Simi Valley), pop. 753,197: 0.112
98.  Sussex County, DE (Milford, Seaford, Georgetown), pop. 156,638: 0.112
99.  Anne Arundel County, MD (Glen Burnie, Annapolis, Severn), pop. 489,656: 0.112
100.  Platte County, MO (Parkville, Platte City, Riverside), pop. 73,781: 0.112
101.  West Baton Rouge Parish, LA (Port Allen, Addis, Brusly), pop. 21,601: 0.112



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