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

Table 4-47: 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)

(R) Metropolitan Statistical Area All sites (R)Number of trend sites Trend sites
Total number of sites in 2008 Number of days with AQI > 100 (2008)
1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008
Akron, OH 18 8 7 23 21 26 16 37 40 14 28 38 15 10 30 5 22 8
Albany-Schenectady-Troy, NY 26 8 5 13 12 9 8 9 15 3 18 17 9 5 8 2 13 7
Albuquerque, NM 75 24 17 5 3 5 2 3 5 7 1 11 15 5 9 3 1 0
Allentown-Bethlehem-Easton, PA-NJ 24 9 5 10 18 19 22 39 31 16 34 38 13 12 16 10 12 9
Atlanta-Sandy Springs-Marietta, GA 62 31 18 27 (R) 54 (R) 44 (R) 50 (R) 78 (R) 88 (R) 66 (R) 39 (R) 41 (R) 23 (R) 21 (R) 30 (R) 40 (R) 37 24
Austin-Round Rock, TX 25 2 1 8 28 5 2 9 14 14 5 8 9 8 9 13 4 2
Bakersfield, CA 54 152 15 129 133 127 94 104 161 164 158 186 169 160 122 137 131 147
Baltimore-Towson, MD 74 23 17 61 57 43 46 70 54 39 50 59 31 31 36 34 45 23
Baton Rouge, LA 53 16 20 (R) 25 (R) 36 (R) 20 (R) 39 (R) 32 (R) 43 (R) 51 (R) 20 (R) 18 (R) 24 (R) 22 (R) 44 (R) 28 (R) 24 8
Birmingham-Hoover, AL 60 14 21 11 50 25 29 38 65 68 41 28 17 17 35 33 41 11
Boston-Cambridge-Quincy, MA-NH 123 8 16 0 (R) 1 (R) 1 0 0 (R) 6 0 3 (R) 11 8 1 4 1 3 0
Bradenton-Sarasota-Venice, FL 27 5 8 7 6 3 14 15 11 16 14 3 10 18 11 5 4 5
Bridgeport-Stamford-Norwalk, CT 38 19 11 28 28 22 31 35 29 22 33 41 19 11 25 21 27 19
Buffalo-Niagara Falls, NY 41 4 10 13 12 6 5 26 22 7 24 29 13 8 23 (R) 6 18 4
Charleston-North Charleston, SC 23 1 9 3 1 5 5 12 13 9 0 4 3 3 8 7 5 1
Charlotte-Gastonia-Concord, NC-SC 52 24 8 15 32 40 41 67 62 (R) 38 (R) 31 (R) 41 12 (R) 16 (R) 25 21 33 16
Chicago-Naperville-Joliet, IL-IN-WI 230 3 61 (R) 24 (R) 42 (R) 25 (R) 23 (R) 36 (R) 46 (R) 31 (R) 66 (R) 39 (R) 28 (R) 20 (R) 36 (R) 11 (R) 27 2
Cincinnati-Middletown, OH-KY-IN 106 16 23 (R) 35 (R) 39 (R) 35 (R) 24 (R) 43 (R) 50 (R) 26 (R) 34 (R) 44 (R) 26 (R) 12 (R) 38 (R) 18 (R) 42 14
Cleveland-Elyria-Mentor, OH 82 13 24 32 (R) 28 (R) 28 (R) 21 (R) 32 (R) 47 (R) 25 (R) 33 (R) 34 (R) 19 (R) 20 (R) 33 (R) 16 (R) 10 12
Colorado Springs, CO 61 2 5 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Columbia, SC 41 8 10 7 10 4 14 32 29 25 16 14 3 9 11 10 7 7
Columbus, OH 31 10 7 23 27 26 17 40 37 16 20 38 12 3 20 5 13 4
Dallas-Fort Worth-Arlington, TX 130 32 13 (R) 56 (R) 60 (R) 35 (R) 47 (R) 58 (R) 41 (R) 54 (R) 43 (R) 40 (R) 40 (R) 32 (R) 56 (R) 39 (R) 16 20
Dayton, OH 23 9 5 (R) 12 (R) 10 (R) 17 (R) 11 (R) 9 (R) 18 (R) 6 (R) 13 (R) 20 (R) 6 (R) 0 (R) 12 (R) 1 (R) 3 0
Denver-Aurora, CO 85 13 22 13 11 12 7 18 9 15 17 26 32 2 11 27 21 10
Detroit-Warren-Livonia, MI 73 7 31 21 20 26 18 33 41 17 41 (R) 33 25 11 (R) 37 12 21 7
El Paso, TX 60 17 12 8 6 10 5 12 7 15 13 10 10 3 8 8 6 5
Fresno, CA 39 92 20 90 91 105 118 86 164 164 186 204 167 84 95 97 93 89
Grand Rapids-Wyoming, MI 13 1 6 (R) 14 (R) 15 (R) 11 (R) 9 (R) 4 (R) 10 (R) 6 (R) 15 (R) 17 (R) 10 (R) 3 (R) 16 (R) 7 (R) 8 1
Greenville-Mauldin-Easley, SC 22 7 5 (R) 3 (R) 15 (R) 17 (R) 13 (R) 17 (R) 36 (R) 20 (R) 23 (R) 28 (R) 7 (R) 2 (R) 11 (R) 10 (R) 8 6
Harrisburg-Carlisle, PA 16 12 8 28 28 17 21 37 31 17 42 35 13 8 19 13 19 11
Hartford-West Hartford-East Hartford, CT 35 10 7 (R) 25 (R) 28 (R) 14 (R) 19 (R) 26 (R) 26 14 (R) 27 (R) 34 13 (R) 11 19 (R) 15 (R) 24 10
Honolulu, HI 31 0 11 0 0 0 0 0 2 2 2 2 2 2 2 1 0 0
Houston-Sugar Land-Baytown, TX 126 29 23 55 82 38 58 61 64 57 42 40 47 37 49 31 25 17
Indianapolis-Carmel, IN 83 5 25 45 39 32 27 36 43 17 27 38 17 4 34 14 24 3
Jacksonville, FL 28 0 14 1 1 2 1 14 6 3 5 1 0 4 6 7 8 0
Kansas City, MO-KS 85 3 13 (R) 19 (R) 32 (R) 13 (R) 20 (R) 23 (R) 13 (R) 19 (R) 9 (R) 22 (R) 20 1 (R) 18 24 10 0
Knoxville, TN 51 18 18 (R) 34 (R) 51 (R) 49 (R) 60 (R) 88 (R) 92 (R) 58 (R) 39 (R) 63 31 14 39 (R) 27 (R) 50 18
Las Vegas-Paradise, NV 94 12 6 22 6 21 9 9 8 6 2 13 10 4 9 12 7 0
Little Rock-North Little Rock-Conway, AR 28 2 6 8 24 9 10 13 16 29 17 18 3 0 19 11 11 2
Los Angeles-Long Beach-Santa Ana, CA 157 80 51 145 (R) 123 97 65 (R) 63 71 (R) 85 105 (R) 95 (R) 107 99 60 56 59 53
Louisville/Jefferson County, KY-IN 56 9 17 47 41 28 32 48 78 29 36 50 21 9 39 15 30 8
Madison, WI 17 1 3 1 15 7 5 8 12 3 7 10 8 1 9 1 10 1
McAllen-Edinburg-Mission, TX 8 1 1 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0
Memphis, TN-MS-AR 49 10 12 37 56 39 35 55 56 52 33 34 29 11 37 30 35 10
Miami-Fort Lauderdale-Pompano Beach, FL 83 5 26 (R) 6 (R) 10 (R) 4 (R) 6 (R) 11 (R) 12 (R) 10 (R) 5 (R) 3 (R) 2 (R) 3 (R) 1 (R) 6 (R) 9 5
Milwaukee-Waukesha-West Allis, WI 55 3 12 17 23 15 6 16 (R) 25 (R) 8 25 (R) 21 17 6 (R) 21 6 11 3
Minneapolis-St. Paul-Bloomington, MN-WI 131 2 20 4 9 0 4 4 4 8 10 4 5 0 7 1 5 1
Nashville-Davidson-Murfreesboro-Franklin, TN 51 11 18 31 46 46 44 45 66 (R) 48 23 33 20 7 26 17 (R) 33 9
New Haven-Milford, CT 50 11 7 (R) 19 (R) 23 (R) 15 (R) 25 (R) 15 (R) 22 (R) 18 (R) 22 (R) 32 (R) 17 (R) 6 (R) 19 (R) 8 (R) 13 9
New Orleans-Metairie-Kenner, LA 61 5 7 (R) 12 (R) 33 (R) 11 (R) 15 (R) 17 (R) 35 (R) 29 (R) 18 (R) 4 (R) 15 (R) 12 (R) 13 (R) 13 (R) 17 2
New York-Northern New Jersey-Long Island, NY-NJ-PA 254 35 57 (R) 56 (R) 44 (R) 43 (R) 42 (R) 57 (R) 53 (R) 35 (R) 54 (R) 61 (R) 33 (R) 32 (R) 41 (R) 38 (R) 38 29
Oklahoma City, OK 34 5 9 21 29 10 15 35 17 16 24 10 13 6 12 31 4 4
Omaha-Council Bluffs, NE-IA 40 3 12 1 (R) 3 0 1 (R) 3 (R) 5 3 2 0 1 1 1 0 1 0
Orlando-Kissimmee, FL 25 2 13 7 9 6 6 23 13 14 12 5 4 5 8 8 8 1
Oxnard-Thousand Oaks-Ventura, CA 38 31 14 97 100 95 75 54 54 57 52 26 47 41 36 31 22 30
Philadelphia-Camden-Wilmington, PA-NJ-DE-MD 141 30 48 (R) 56 (R) 62 (R) 43 (R) 42 (R) 63 (R) 55 (R) 39 (R) 57 (R) 60 (R) 37 (R) 23 (R) 36 (R) 30 (R) 42 28
Phoenix-Mesa-Scottsdale, AZ 160 188 23 33 (R) 39 (R) 45 (R) 32 (R) 47 (R) 47 (R) 34 25 22 26 9 23 25 11 11
Pittsburgh, PA 125 39 41 (R) 37 (R) 38 (R) 31 (R) 40 (R) 59 50 40 56 (R) 62 42 40 54 41 44 22
Portland-Vancouver-Beaverton, OR-WA 68 7 10 5 4 12 0 9 6 5 4 7 2 4 4 2 5 3
Poughkeepsie-Newburgh-Middletown, NY 8 8 2 12 14 14 10 16 18 7 17 16 5 4 6 1 11 5
Providence-New Bedford-Fall River, RI-MA 61 6 8 (R) 21 (R) 20 (R) 16 (R) 20 (R) 16 (R) 18 (R) 17 (R) 27 (R) 33 (R) 17 (R) 9 (R) 19 (R) 12 (R) 12 4
Raleigh-Cary, NC 37 11 2 11 10 13 29 46 43 (R) 15 11 39 8 3 12 7 17 5
Richmond, VA 35 17 9 26 28 23 40 50 39 17 24 40 14 5 23 14 19 15
Riverside-San Bernardino-Ontario, CA 146 128 43 167 154 147 131 117 151 171 183 175 158 147 141 128 135 119
Rochester, NY 17 4 1 8 10 1 10 11 17 2 14 16 5 0 0 (R) 1 (R) 5 2
Sacramento--Arden-Arcade--Roseville, CA 111 62 22 69 61 70 39 55 (R) 94 65 72 90 66 55 58 74 32 44
St. Louis, MO-IL 158 9 35 49 (R) 47 35 32 (R) 46 45 30 (R) 35 (R) 48 29 (R) 12 (R) 45 22 34 6
Salt Lake City, UT 49 17 11 27 8 14 3 20 18 23 29 34 20 38 32 (R) 20 28 15
San Antonio, TX 41 10 2 7 32 7 10 12 20 5 4 26 18 6 10 8 3 7
San Diego-Carlsbad-San Marcos, CA 64 37 24 90 94 (R) 60 39 51 49 58 53 35 40 27 26 39 33 35
San Francisco-Oakland-Fremont, CA 116 12 28 (R) 5 (R) 13 (R) 9 (R) 2 (R) 11 (R) 23 (R) 14 (R) 20 (R) 28 (R) 14 (R) 10 (R) 6 (R) 13 (R) 5 7
San Jose-Sunnyvale-Santa Clara, CA 38 15 6 (R) 13 (R) 21 (R) 37 (R) 7 (R) 21 (R) 14 (R) 9 (R) 9 (R) 24 (R) 14 (R) 7 (R) 4 (R) 13 (R) 3 13
San Juan-Caguas-Guaynabo, PR 51 1 5 0 0 1 1 0 0 0 1 0 0 0 0 0 1 0
Scranton--Wilkes-Barre, PA 19 5 10 19 25 14 19 26 25 (R) 7 (R) 23 30 (R) 6 4 12 3 7 5
Seattle-Tacoma-Bellevue, WA 120 7 14 (R) 3 (R) 3 (R) 5 (R) 0 (R) 6 (R) 7 (R) 18 (R) 14 (R) 13 (R) 10 (R) 4 (R) 6 (R) 10 (R) 9 7
Springfield, MA 42 11 10 28 17 8 22 24 18 7 28 24 13 9 16 12 21 10
Stockton, CA 16 21 5 6 11 7 2 19 22 14 11 13 6 3 5 16 11 10
Syracuse, NY 19 3 5 8 10 3 6 10 12 2 13 19 4 0 8 3 8 3
Tampa-St. Petersburg-Clearwater, FL 73 7 24 10 14 8 24 20 23 29 18 5 13 11 15 9 12 7
Toledo, OH 20 4 6 12 15 20 8 15 18 9 24 23 15 9 25 4 5 1
Tucson, AZ 51 3 20 10 14 8 8 7 8 5 0 7 7 0 8 9 1 2
Tulsa, OK 35 9 8 26 39 23 12 24 24 21 21 22 16 1 19 24 2 7
Virginia Beach-Norfolk-Newport News, VA-NC 29 15 7 19 22 12 37 34 32 23 14 31 10 5 12 11 9 15
Washington-Arlington-Alexandria, DC-VA-MD-WV 120 22 37 43 54 39 51 65 61 (R) 34 41 54 21 21 36 31 38 16
Wichita, KS 21 1 8 1 7 3 8 12 9 9 20 10 7 1 4 2 0 1
Worcester, MA 21 8 2 20 15 2 8 14 14 4 9 15 9 3 8 5 20 8
Youngstown-Warren-Boardman, OH-PA 23 11 11 (R) 23 (R) 18 (R) 20 (R) 17 (R) 45 (R) 24 (R) 12 (R) 43 (R) 33 (R) 13 (R) 5 (R) 25 (R) 8 (R) 17 8

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. Thus, this edition of this table is not comparable to previous editions.

Data for 1999 to 2008 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 Jan. 20, 2010.