Table 4-47: Air Pollution Trends in Selected Metropolitan Statistical Areas

Table 4-47: Air Pollution Trends in Selected Metropolitan Statistical Areas

(Number of days with AQI values greater than 100 at trend sites and all monitoring sites)

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Metropolitan Statistical Area All sites Trend sites
Total number of sites AQI days > 100 (2005) Number of trend sites 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006
Akron,OH 18 13 7 8 12 11 6 14 25 9 22 24 (R) 6 (R) 6 13 0
Albany-Schenectady-Troy,NY 25 5 5 6 3 4 3 3 6 1 11 8 5 2 3 1
Albuquerque,NM 68 3 18 1 0 0 0 0 1 0 2 4 2 2 0 1
Allentown-Bethlehem-Easton,PA 22 12 5 3 7 6 12 18 19 10 20 25 8 5 (R) 10 4
Atlanta,GA 49 19 19 15 35 25 31 50 73 39 24 20 12 12 11 18
Austin-San Marcos,TX 21 3 1 4 10 0 0 5 8 6 0 5 3 2 1 3
Bakersfield,CA 53 90 15 98 105 109 55 76 (R) 130 132 123 150 141 (R) 131 (R) 85 97
Baltimore,MD 71 27 20 40 36 28 30 51 41 23 33 42 20 16 (R) 25 20
Baton Rouge,LA 33 15 12 7 15 9 12 14 17 29 5 10 15 (R) 10 12 14
Bergen-Passaic,NJ 17 14 6 0 0 0 0 1 2 1 1 1 2 1 4 2
Birmingham,AL 48 31 21 6 32 15 8 23 51 49 (R) 29 (R) 16 (R) 9 13 (R) 29 20
Boston,MA-NH 75 10 10 0 0 0 0 0 (R) 4 0 3 9 8 1 (R) 4 1
Buffalo-Niagara Falls,NY 33 9 10 4 6 3 1 13 8 5 13 (R) 21 8 0 (R) 8 3
Charleston-North Charleston,SC 21 4 12 2 1 3 3 3 5 7 0 3 0 1 4 1
Charlotte-Gastonia-Rock Hill,NC-SC 59 20 10 9 11 16 24 47 34 22 (R) 13 27 4 5 (R) 11 8
Chicago,IL 141 23 46 7 23 6 9 10 19 13 33 (R) 20 10 9 23 5
Cincinnati,OH-KY-IN 84 20 17 16 19 10 11 13 18 15 16 (R) 30 10 4 (R) 13 2
Cleveland-Lorain-Elyria,OH 80 28 27 23 24 17 10 20 (R) 35 21 (R) 27 30 (R) 14 (R) 16 (R) 20 6
Columbus,OH 30 12 7 9 15 13 7 17 24 12 14 21 9 1 8 1
Dallas,TX 81 32 7 24 20 8 20 24 16 20 14 7 5 9 10 13
Dayton-Springfield,OH 22 11 10 14 11 18 9 19 (R) 17 9 (R) 10 (R) 25 7 (R) 2 (R) 9 1
Denver,CO 82 2 23 2 3 0 0 7 3 2 8 7 (R) 17 0 1 6
Detroit,MI 75 25 31 11 14 13 11 17 23 (R) 15 31 (R) 26 19 (R) 5 (R) 24 6
El Paso,TX 56 6 14 6 3 6 2 6 5 5 8 12 7 3 (R) 4 5
Fort Lauderdale,FL 34 0 13 1 1 1 0 1 4 3 3 3 0 0 0 2
Fort Worth-Arlington,TX 33 27 7 31 28 14 14 17 19 17 17 23 25 11 22 19
Fresno,CA 43 64 20 55 61 70 75 67 133 (R) 128 (R) 136 (R) 150 (R) 125 (R) 46 (R) 62 71
Gary,IN 62 13 14 6 17 11 11 9 21 (R) 17 (R) 32 21 (R) 8 (R) 6 (R) 11 0
Grand Rapids-Muskegon-Holland,MI 39 21 13 14 18 9 10 19 23 7 18 24 12 4 (R) 19 9
Greensboro-Winston Salem-High Point,NC 57 6 10 7 6 6 13 25 22 14 11 24 4 (R) 1 2 4
Greenville-Spartanburg-Anderson,SC 24 5 8 5 7 7 9 28 19 15 15 29 4 2 (R) 4 6
Harrisburg-Lebanon-Carlisle,PA 15 16 9 12 13 3 9 22 19 16 22 (R) 20 (R) 9 5 (R) 11 7
Hartford,CT 32 11 7 18 14 5 16 10 18 7 18 23 8 6 11 6
Honolulu,HI 30 3 11 0 0 0 0 0 2 2 2 2 2 2 (R) 2 1
Houston,TX 92 40 22 38 65 26 46 38 51 42 (R) 28 21 31 22 28 18
Indianapolis,IN 85 20 26 22 19 13 12 19 23 8 (R) 13 24 11 1 (R) 17 2
Jacksonville,FL 26 3 14 0 0 0 0 3 2 1 3 0 0 0 (R) 3 0
Jersey City,NJ 16 10 7 12 16 5 9 7 20 4 7 8 5 1 8 10
Kansas City,MO-KS 75 16 16 10 21 6 16 14 3 10 (R) 4 7 11 0 (R) 9 11
Knoxville,TN 52 18 18 16 24 20 36 54 (R) 60 34 (R) 22 43 14 3 14 11
Las Vegas,NV-AZ 86 10 9 2 0 2 0 0 0 0 1 2 (R) 2 (R) 0 2 2
Little Rock-North Little Rock,AR 26 12 4 2 7 1 1 2 6 16 4 (R) 9 1 0 (R) 8 4
Los Angeles-Long Beach,CA 120 80 52 127 103 77 42 49 54 63 81 81 88 65 (R) 43 34
Louisville,KY-IN 53 17 17 28 24 11 18 29 47 15 18 28 (R) 11 3 (R) 15 7
Memphis,TN-AR-MS 40 15 13 10 21 19 17 27 35 28 15 17 9 2 12 9
Miami,FL 19 1 15 1 2 1 3 8 7 2 1 1 1 3 (R) 0 1
Middlesex-Somerset-Hunterdon,NJ 13 15 4 9 16 8 18 21 23 9 (R) 13 (R) 20 (R) 8 6 12 5
Milwaukee-Waukesha,WI 53 18 17 9 14 5 4 10 18 5 (R) 20 (R) 10 9 6 (R) 16 4
Minneapolis-St. Paul,MN-WI 121 6 17 2 3 0 0 1 0 (R) 6 6 1 1 0 2 0
Monmouth-Ocean,NJ 5 16 4 13 20 17 21 31 27 11 21 32 13 8 16 10
Nashville,TN 50 11 17 21 26 22 20 30 (R) 37 (R) 20 7 16 7 1 (R) 10 6
Nassau-Suffolk,NY 19 10 7 15 10 8 12 11 18 5 5 14 7 3 10 5
New Haven-Meriden,CT 36 16 8 13 14 8 19 9 (R) 18 (R) 8 15 25 16 3 13 8
New Orleans,LA 51 5 14 8 20 8 7 7 18 20 6 2 8 5 4 4
New York,NY 104 16 15 13 17 11 22 14 22 19 (R) 19 (R) 27 (R) 11 6 15 11
Newark,NJ 43 15 15 12 20 11 13 22 26 12 (R) 18 (R) 29 (R) 11 7 (R) 11 13
Norfolk-Virginia Beach-Newport News,VA_NC 24 1 12 6 6 4 17 15 17 5 7 15 4 2 1 3
Oakland,CA 81 5 17 1 8 4 0 6 (R) 17 (R) 10 (R) 11 (R) 21 (R) 7 (R) 7 (R) 5 10
Oklahoma City,OK 30 4 10 5 13 2 4 7 4 7 2 (R) 2 (R) 2 0 2 11
Omaha,NE-IA 36 1 13 1 1 0 0 5 5 (R) 1 2 0 (R) 1 1 1 0
Orange County,CA 30 9 8 14 8 6 3 5 4 5 6 4 5 3 0 5
Orlando,FL 22 5 14 3 1 1 4 11 4 3 4 1 0 0 5 1
Philadelphia,PA-NJ 91 27 43 26 30 22 32 37 (R) 33 21 (R) 34 35 (R) 19 (R) 9 (R) 21 18
Phoenix-Mesa,AZ 145 19 25 6 16 14 12 14 9 (R) 14 (R) 8 (R) 10 8 1 (R) 6 7
Pittsburgh,PA 121 48 44 19 25 11 20 39 40 32 (R) 50 50 37 39 48 36
Portland-Vancouver,OR-WA 49 4 14 2 2 6 0 3 5 (R) 6 (R) 2 6 0 3 (R) 2 2
Providence-Fall River-Warwick,RI-MA 47 8 6 0 0 0 0 0 (R) 8 (R) 5 (R) 14 (R) 13 3 (R) 2 (R) 6 2
Raleigh-Durham-Chapel Hill,NC 56 10 6 2 1 1 13 21 27 8 4 18 5 1 (R) 3 0
Richmond-Petersburg,VA 26 7 10 9 14 5 19 22 21 5 12 21 3 1 (R) 5 7
Riverside-San Bernardino,CA 139 106 42 149 124 118 104 95 121 144 (R) 153 146 138 (R) 116 103 97
Rochester,NY 16 0 6 1 6 0 6 4 (R) 7 1 5 (R) 10 (R) 2 0 0 0
Sacramento,CA 91 53 21 36 41 40 14 27 65 41 47 57 (R) 36 26 39 43
St, Louis,MO-IL 134 35 43 31 34 20 15 23 31 20 20 (R) 33 13 2 (R) 27 12
Salt Lake City-Ogden,UT 70 34 13 11 4 8 1 12 (R) 12 (R) 19 (R) 25 (R) 27 10 37 (R) 24 11
San Antonio,TX 23 4 2 3 17 2 3 6 9 0 0 17 4 4 3 2
San Diego,CA 57 9 29 46 48 30 14 32 33 31 30 20 20 16 7 15
San Francisco,CA 26 2 11 0 2 0 0 0 (R) 10 (R) 4 (R) 12 (R) 17 (R) 1 (R) 4 (R) 5 2
San Jose,CA 31 10 5 2 11 7 0 5 17 20 12 9 6 2 6 5
SanJuan-Bayamon,PR 52 0 14 0 0 1 1 0 0 0 1 0 0 0 0 0
Scranton-Wilkes Barre-Hazleton,PA 18 4 12 7 12 4 11 7 12 3 12 (R) 22 6 1 4 1
Seattle-Bellevue-Everett,WA 63 1 9 1 0 0 0 3 6 (R) 8 6 (R) 7 2 1 (R) 3 5
Springfield,MA 39 13 11 12 9 4 9 7 14 4 17 17 9 4 (R) 11 6
Syracuse,NY 19 2 5 1 5 0 2 3 4 1 4 10 2 0 2 0
Tacoma,WA 17 3 4 2 0 1 0 4 1 (R) 15 (R) 10 (R) 9 (R) 3 3 (R) 4 8
Tampa-St. Petersburg-Clearwater,FL 63 11 24 3 2 3 4 11 10 8 4 0 5 0 4 2
Toledo,OH 17 10 5 8 9 11 4 5 (R) 11 5 (R) 13 15 (R) 9 2 10 0
Tucson,AZ 52 2 20 0 3 0 1 0 7 0 0 3 1 0 (R) 1 0
Tulsa,OK 27 7 8 11 19 12 5 7 13 10 6 5 7 0 4 7
Ventura,CA 38 12 16 63 65 62 43 29 24 31 24 10 22 13 11 13
Washington,DC-MD-VA-WV 117 23 42 21 32 18 30 46 (R) 41 (R) 20 (R) 27 (R) 33 (R) 12 10 (R) 18 18
West Palm Beach-Boca Raton,FL 23 0 5 0 0 0 0 2 1 1 1 0 0 0 0 0
Wilmington-Newark,DE-MD 41 13 8 24 27 13 21 24 22 21 (R) 24 22 11 4 12 10
Youngstown-Warren,OH 29 11 8 1 8 6 7 15 15 5 18 18 6 0 5 2

KEY: AQI = Air Quality Index; R = revised.

NOTES

The Air Quality Index (AQI) integrates information on 6 major pollutants (particulate matter less than 10 microns in diameter, particulate matter less than 2.5 microns in diameter, sulfur dioxide, carbon monoxide, ozone, and nitrogen dioxide) across an entire monitoring network into a single number that represents the worst daily air quality experienced in an urban area. An AQI greater than 100 indicates that at least 1 criteria pollutant exceeded air quality standards on a given day; therefore, air quality would be in the unhealthful range on that day. Air quality monitoring sites are selected as "trend sites" if they have complete data for at least 8 of the 10 last years.

SOURCE

U.S. Environmental Protection Agency, Office of Air and Radiation, Air Trends, Factbook and Related Information, available at http://www.epa.gov/airtrends/factbook.html as of Nov.28, 2007.