Table 4-51: Air Pollution Trends in Selected Metropolitan Statistical Areas

Table 4-51: Air Pollution Trends in Selected Metropolitan Statistical Areas

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

Metropolitan Statistical Area All sites Trend sites
(R) Total number of sites in 2010 (R) Number of days with AQI > 100 (2010) (R) Number of trend sites Number of days with AQI > 100
1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010
Akron, OH 18 4 7 69 49 66 72 73 83 52 71 82 57 60 62 34 23 8 0 4
Albany-Schenectady-Troy, NY 26 4 7 13 12 9 8 9 15 (R) 4 18 (R) 18 (R) 10 5 (R) 9 (R) 3 (R) 15 (R) 8 1 4
Albuquerque, NM 77 2 15 5 4 5 2 3 6 8 2 11 15 5 9 3 1 0 0 1
Allentown-Bethlehem-Easton, PA 28 18 5 17 18 19 23 39 32 16 34 38 14 13 18 10 12 10 1 12
Atlanta-Sandy Springs-Marietta, GA 64 27 17 35 57 50 61 84 97 72 42 44 24 22 32 46 40 25 11 14
Austin-Round Rock, TX 25 3 1 8 28 5 2 9 14 14 5 8 9 8 9 13 4 2 4 2
Bakersfield, CA 57 84 14 129 133 127 94 104 (R) 158 (R) 162 158 (R) 185 (R) 165 (R) 159 (R) 119 137 (R) 129 (R) 145 123 84
Baltimore-Towson, MD 73 33 16 62 57 43 46 70 55 37 50 59 30 31 36 33 45 23 11 33
Baton Rouge, LA 53 33 18 50 60 44 56 52 61 72 39 49 43 54 90 48 44 31 28 25
Bergen-Passaic, NJ 20 22 6 0 0 0 0 1 2 1 1 1 2 1 4 2 1 U U U
Birmingham-Hoover, AL 60 15 21 37 50 26 30 40 71 89 44 28 31 17 37 36 41 12 5 13
Boston-Cambridge-Quincy, MA-NH 125 5 15 10 1 2 1 3 (R) 8 0 4 (R) 11 8 1 4 1 3 0 0 1
Bradenton-Sarasota-Venice, FL 29 2 3 7 6 3 14 15 (R) 10 16 14 3 10 18 11 5 4 5 1 1
Bridgeport-Stamford-Norwalk, CT 38 17 10 39 28 22 31 37 29 22 33 41 19 11 25 21 27 19 5 17
Buffalo-Niagara Falls, NY 41 3 9 (R) 14 (R) 13 (R) 10 (R) 7 (R) 27 (R) 22 (R) 11 (R) 27 (R) 29 (R) 13 (R) 8 (R) 23 (R) 7 (R) 27 4 1 2
Charleston-North Charleston, SC 28 0 8 10 1 7 7 12 13 9 0 4 3 3 8 9 5 1 0 0
Charlotte-Gastonia-Concord, NC-SC 52 14 7 15 32 40 41 67 62 38 31 41 12 16 25 21 33 16 2 14
Chicago-Naperville-Joliet, IL-IN-WI 231 28 59 69 80 47 57 84 81 51 86 46 37 28 53 28 52 46 24 28
Cincinnati-Middletown, OH-KY-IN 109 27 20 (R) 37 (R) 39 (R) 36 (R) 31 (R) 44 (R) 52 (R) 28 (R) 39 (R) 47 (R) 28 (R) 16 (R) 41 (R) 19 (R) 42 14 5 16
Cleveland-Elyria-Mentor, OH 91 73 24 153 116 109 80 94 120 61 62 86 72 62 89 64 60 54 3 16
Columbia, SC 43 9 7 11 15 23 28 45 37 26 24 23 14 17 22 18 14 14 3 9
Columbus, OH 32 6 7 23 27 26 17 40 37 16 20 38 12 3 20 5 13 4 1 2
Dallas-Fort Worth-Arlington, TX 135 18 10 56 60 35 47 58 41 54 43 40 40 32 56 39 16 20 19 11
Dayton, OH 23 13 4 12 10 17 11 9 17 3 8 19 2 0 10 1 3 0 1 1
Denver-Aurora, CO 88 11 17 31 17 24 20 22 11 15 19 15 23 4 10 21 16 4 4 4
Detroit-Warren-Livonia, MI 75 23 22 31 37 43 29 50 72 38 58 54 37 37 62 38 35 24 9 23
El Paso, TX 63 9 13 49 72 61 27 33 8 16 14 15 13 5 10 10 8 8 2 3
Fort Lauderdale, FL 36 7 12 3 3 2 3 9 7 5 5 3 0 1 1 4 7 U U U
Fort Worth-Arlington, TX 37 21 6 53 52 28 27 32 33 38 31 37 38 25 43 34 12 U U U
Fresno, CA 41 62 20 90 91 105 118 86 164 164 186 204 167 84 95 97 93 89 80 62
Gary, IN 63 16 16 12 30 17 15 22 33 18 45 27 15 8 19 3 11 U U U
Grand Rapids-Wyoming, MI 13 2 6 14 15 11 9 4 (R) 11 6 (R) 16 17 10 3 16 (R) 8 8 1 1 1
Greensboro-Winston Salem-High Point, NC 62 39 5 20 25 18 30 48 38 29 22 42 13 5 14 8 21 U U U
Greenville-Mauldin-Easley, SC 26 3 5 3 15 17 13 18 36 20 24 28 7 2 11 10 8 6 0 1
Harrisburg-Carlisle, PA 16 5 8 33 33 18 23 38 33 19 42 37 16 10 22 14 20 13 0 4
Hartford-West Hartford-East Hartford, CT 35 9 6 25 28 14 19 26 26 14 27 34 13 11 19 15 24 10 3 9
Honolulu, HI 31 0 9 0 0 0 0 1 1 2 2 1 2 2 2 1 0 0 0 0
Houston-Sugarland-Baytown, TX 128 34 25 66 92 56 67 65 74 69 50 44 55 42 58 35 28 18 18 21
Indianapolis-Carmel, IN 90 15 19 (R) 60 (R) 48 (R) 36 (R) 30 (R) 40 (R) 45 (R) 25 (R) 33 (R) 48 (R) 32 (R) 20 (R) 48 (R) 25 (R) 33 7 6 8
Jacksonville, FL 33 16 12 53 25 26 26 41 34 59 38 57 8 15 20 34 15 10 3 15
Jersey City, NJ 17 14 8 19 21 15 20 16 28 9 17 22 10 5 13 13 12 U U U
Kansas City, MO-KS 86 25 13 19 36 15 20 23 13 21 9 26 45 33 42 65 34 36 41 18
Knoxville, TN 53 16 17 53 82 87 82 109 126 97 86 118 96 98 101 84 107 80 20 15
Las Vegas-Paradise, NV 100 10 3 (R) 7 (R) 3 (R) 12 (R) 2 (R) 7 8 (R) 4 (R) 1 (R) 8 10 4 8 (R) 9 (R) 5 0 0 1
Little Rock-North Little Rock-Conway, AR 30 2 8 8 24 9 10 13 16 29 17 18 3 0 19 11 11 2 2 2
Los Angeles-Long Beach-Santa Ana, CA 169 79 50 200 178 141 117 93 (R) 140 119 (R) 130 110 120 106 65 (R) 62 60 68 54 37
Louisville/Jefferson County, KY-IN 62 54 14 89 69 58 59 79 110 73 79 62 58 54 71 51 75 44 25 29
Madison, WI 18 2 3 1 15 7 5 8 12 3 7 10 8 1 9 1 10 1 0 2
McAllen-Edinburg-Mission, TX 8 0 1 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0 0 0
Memphis, TN-AR-MS 49 14 9 37 56 (R) 38 35 55 56 52 33 34 29 11 (R) 36 30 (R) 33 10 4 13
Miami-Fort Lauderdale-Pompano Beach, FL 91 4 24 16 16 9 9 14 20 18 8 5 4 11 4 11 10 5 2 3
Middlesex-Somerset-Hunterdon, NJ 15 30 4 19 31 19 28 39 35 19 29 36 11 15 22 9 21 U U U
Milwaukee-Waukesha-West Allis, WI 58 9 12 17 23 15 6 16 25 8 25 21 17 6 21 6 11 3 5 8
Minneapolis-St. Paul-Bloomington, MN-WI 132 4 18 18 22 6 7 5 5 9 12 5 15 11 11 1 5 1 2 1
Monmouth-Ocean, NJ 5 21 4 41 34 31 32 46 35 19 35 46 25 22 27 19 21 U U U
Nashville-Davidson-Murfreesboro-Franklin, TN 51 10 17 (R) 32 (R) 49 (R) 46 (R) 50 (R) 46 (R) 73 (R) 48 (R) 24 (R) 34 20 7 (R) 29 17 34 9 1 9
Nassau-Suffolk, NY 22 16 5 28 20 14 23 27 28 12 14 22 15 6 19 11 14 U U U
New Haven-Milford, CT 50 10 7 19 23 15 25 15 22 18 22 32 17 6 19 8 13 9 1 8
New Orleans-Metairie-Kenner, LA 61 66 7 12 33 11 15 17 35 29 18 4 15 12 13 13 17 2 6 8
New York-Northern New Jersey-Long Island, NY-NJ-PA 268 37 53 (R) 68 (R) 48 (R) 51 (R) 52 (R) 62 (R) 57 (R) 39 (R) 56 (R) 62 (R) 37 (R) 38 (R) 46 (R) 39 39 29 11 31
Newark, NJ 44 21 16 33 33 24 23 35 36 17 34 43 14 8 18 25 21 U U U
Oakland, CA 86 7 19 5 13 9 2 11 20 12 15 23 13 8 6 13 5 U U U
Oklahoma City, OK 36 3 8 21 29 10 15 36 17 16 24 10 13 6 12 31 4 4 5 2
Omaha-Council Bluffs, NE-IA 41 3 11 1 3 0 1 3 5 3 2 0 1 1 1 0 1 0 1 1
Orange County, CA 30 19 8 30 20 13 8 7 7 11 6 6 15 10 0 7 9 U U U
Orlando-Kissimmee, FL 28 2 13 7 9 6 6 23 13 15 13 5 4 5 8 8 8 1 0 1
Oxnard-Thousands Oaks-Ventura, CA 38 13 14 100 103 98 76 54 54 57 52 26 48 41 36 31 22 30 24 10
Philadelphia-Camden-Wilmington, PA-NJ-DE-MD 143 32 47 117 125 (R) 100 105 101 99 60 90 97 (R) 76 38 59 53 45 29 7 30
Phoenix-Mesa-Scottsdale, AZ 165 43 23 33 41 47 33 49 52 46 25 22 26 9 23 25 11 11 6 10
Pittsburgh, PA 128 64 38 (R) 175 (R) 117 (R) 118 (R) 143 (R) 151 (R) 150 (R) 121 (R) 111 131 (R) 115 94 (R) 94 (R) 67 (R) 77 60 43 42
Portland-Vancouver-Beaverton, OR-WA 70 1 9 4 4 12 0 9 5 5 4 7 2 4 4 2 5 3 5 1
Poughkeepsie-Newburgh-Middleton, NY 8 4 2 12 14 14 10 16 18 7 17 16 5 4 6 1 11 5 1 4
Providence-New Bedford-Fall River, RI-MA 63 14 5 28 20 22 24 21 23 24 34 38 18 10 20 15 14 4 1 13
Raleigh-Cary, NC 41 3 3 11 10 13 29 46 43 15 11 39 8 3 12 7 17 5 0 2
Richmond, VA 38 11 9 39 33 37 45 54 41 20 27 46 19 12 29 17 24 17 1 7
Riverside-San Bernardino-Ontario, CA 169 116 44 183 190 169 145 131 166 176 188 177 160 148 141 128 135 124 110 109
Rochester, NY 17 0 1 8 10 1 10 11 17 2 14 16 5 0 0 1 5 2 0 0
Sacramento-Arden-Arcade-Roseville, CA 112 24 22 71 61 70 39 56 94 65 72 90 67 56 58 74 40 45 29 14
St, Louis, MO-IL 164 86 28 (R) 138 (R) 146 (R) 121 (R) 99 (R) 92 (R) 106 (R) 77 (R) 81 (R) 85 (R) 65 (R) 33 (R) 72 (R) 28 (R) 35 21 9 19
Salt Lake City, UT 49 17 9 30 8 18 4 21 18 (R) 21 30 (R) 32 (R) 19 36 26 20 27 17 16 17
San Antonio, TX 41 4 2 7 32 7 10 12 20 5 4 26 18 6 10 8 3 7 3 3
San Diego-Carlsbad-San Marcos, CA 65 15 23 97 103 62 44 53 53 58 53 35 41 27 26 39 33 35 25 14
San Francisco-Oakland-Fremont, CA 115 4 33 8 14 13 4 15 21 17 19 26 13 10 6 19 5 12 4 4
San Jose-Sunnyvale-Santa Clara, CA 44 8 5 13 21 37 7 21 14 9 9 24 14 7 4 13 3 13 6 6
San Juan-Caguas-Guaynabo, PR 51 2 6 89 6 2 2 1 4 0 2 1 1 1 1 0 1 0 0 0
Scranton-Wilkes Barre, PA 19 3 10 22 26 25 19 26 25 7 23 30 6 4 12 4 7 5 0 3
Seattle-Tacoma-Bellevue, WA 120 1 10 3 3 5 0 6 6 17 12 13 10 4 6 10 9 7 8 0
Springfield, MA 43 6 10 40 18 8 22 24 20 9 29 24 13 9 17 12 21 10 6 6
Stockton, CA 16 5 5 10 12 7 2 19 23 14 11 13 6 3 5 16 11 10 4 2
Syracuse, NY 19 3 5 8 10 3 6 10 12 2 13 19 4 0 8 3 8 3 1 3
Tacoma, WA 25 14 4 3 3 4 0 6 2 15 11 9 8 4 4 9 7 U U U
Tampa-St. Petersburg-Clearwater, FL 80 12 21 (R) 160 (R) 100 115 (R) 118 (R) 129 (R) 125 (R) 100 (R) 93 (R) 80 (R) 68 (R) 36 30 (R) 19 (R) 26 10 6 1
Toledo, OH 20 4 3 (R) 11 (R) 14 (R) 14 (R) 7 (R) 8 (R) 16 (R) 9 (R) 21 (R) 21 (R) 14 (R) 6 (R) 19 (R) 2 (R) 4 1 2 4
Tucson, AZ 52 0 20 10 14 8 8 7 8 5 0 7 7 0 8 9 1 2 2 0
Tulsa, OK 40 3 8 27 40 27 15 27 30 23 31 22 16 9 22 24 4 13 2 3
Ventura, CA 38 23 14 97 100 95 75 54 54 57 52 26 47 41 36 31 22 U U U
Virginia Beach-Norfolk-Newport News, VA-NC 42 7 7 22 26 15 43 36 35 25 14 33 10 6 12 13 11 16 0 4
Washington-Arlington-Alexandria, DC-MD-VA-WV 127 35 36 50 57 41 56 72 66 38 46 58 29 25 40 32 37 16 4 22
West Palm Beach-Boca Raton, FL 24 3 4 0 0 0 0 0 0 1 0 0 0 0 0 0 2 U U U
Wichita, KS 22 4 9 1 7 3 8 12 9 9 20 10 7 1 4 2 0 1 2 2
Wilmington-Newark, DE-MD 41 27 9 46 47 22 31 42 40 24 36 34 24 10 22 20 25 U U U
Worcester, MA 22 3 2 20 15 2 8 14 14 4 9 15 9 3 8 5 20 8 4 3
Youngstown-Warren-Boardman, OH 26 6 11 27 19 23 19 46 24 12 45 35 16 7 26 8 18 8 2 4

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.

The major reason for revisions to the historical data for the AQI is that changes in the National Ambient Air Quality Standards (NAAQS) are retroactively applied to the data for previous years to provide consistent comparisons over time. In addition, data from monitoring stations that have fallen below/surpassed the criterion to qualify as a 'trend site' is excluded/included in the latest calculation of the index.

Data for 1999 to 2009 include particulate matter 2.5 micron in diameter (PM 2.5).

Particulate matter is the term for solid or liquid particles found in the air.

SOURCE

U.S. Environmental Protection Agency, Office of Air and Radiation, Air Trends, Air Quality Index Information, available at http://www.epa.gov/air/airtrends/aqi_info.html as of Dec. 21, 2011.