Table 7-7: Air Pollution in the 50 Largest Metropolitan Areas: 1999-2005

Table 7-7: Air Pollution in the 50 Largest Metropolitan Areas: 1999-2005

(Number of days with AQI values greater than 100)

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Metropolitan area AQI days > 100
1999 2000 2001 2002 2003 2004 2005
Atlanta, GA 73 39 24 20 12 11 11
Austin-San Marcos, TX 8 6 0 5 3 2 1
Baltimore, MD 41 23 33 42 20 16 27
Boston, MA-NH 3 0 3 7 6 1 1
Buffalo-Niagara Falls, NY 8 5 13 22 8 0 9
Chicago, IL 19 13 33 23 10 9 23
Cincinnati, OH-KY-IN 18 15 15 31 10 4 14
Cleveland-Lorain-Elyria, OH 36 21 29 30 17 18 25
Columbus, OH 24 12 14 21 9 1 8
Dallas, TX 16 20 14 7 5 9 10
Denver, CO 3 2 8 7 16 0 1
Detroit, MI 23 16 31 28 19 9 23
Fort Lauderdale, FL 4 3 3 3 0 0 0
Honolulu, HI 2 2 2 2 2 2 3
Houston, TX 51 42 27 21 31 22 28
Indianapolis, IN 23 8 14 24 11 1 18
Jacksonville, FL 2 1 3 0 0 0 3
Kansas City, MO-KS 3 10 6 7 11 0 10
Las Vegas, NV-AZ 0 0 1 2 3 1 2
Los Angeles-Long Beach, CA 54 63 81 81 88 65 45
Louisville, KY-IN 47 15 18 28 12 3 17
Memphis, TN-AR-MS 35 28 15 17 9 2 12
Miami, FL 7 2 1 1 1 3 1
Milwaukee-Waukesha, WI 18 5 21 11 9 6 17
Minneapolis-St. Paul, MN-WI 0 4 6 1 1 0 2
New Orleans, LA 18 20 6 2 8 5 4
New York, NY 22 19 21 26 14 6 15
Norfolk-VA Beach-Newport News, VA-NC 17 5 7 15 4 2 1
Oklahoma City, OK 4 7 2 3 3 0 2
Orlando, FL 4 3 4 1 0 0 5
Philadelphia, PA-NJ 32 21 35 35 20 14 26
Phoenix-Mesa, AZ 9 11 7 8 8 1 4
Pittsburgh, PA 40 32 55 50 37 39 48
Portland-Vancouver, OR-WA 5 7 3 6 0 3 4
Providence-Fall River-Warwick, RI-MA 3 0 1 3 3 0 1
Richmond-Petersburg, VA 21 5 12 21 3 1 6
Riverside-San Bernardino, CA 121 144 156 146 138 118 103
Sacramento, CA 56 41 46 57 35 26 39
St. Louis, MO-IL 31 20 20 34 13 2 29
Salt Lake City-Ogden, UT 13 20 27 33 10 37 26
San Antonio, TX 9 0 0 17 4 4 3
San Diego, CA 33 31 30 20 20 16 7
San Francisco, CA 2 3 5 1 0 0 0
San Jose, CA 17 20 12 9 6 2 6
Seattle-Bellevue-Everett, WA 6 7 6 6 2 1 1
Tampa-St. Petersburg-Clearwater, FL 10 8 4 0 5 0 4
Tucson, AZ 7 0 0 3 1 0 2
Tulsa, OK 13 10 6 5 7 0 4
Washington, DC-MD-VA-WV 42 22 28 34 13 10 19
West Palm Beach-Boca Raton, FL 1 1 1 0 0 0 0

KEY: AQI = Air Quality Index; U = data are not available.

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.

SOURCE: U.S. Environmental Protection Agency, Office of Air and Radiation, Air Trends, Factbook and Related Information, available at http://www.epa.gov/airtrends/ as of Oct. 23, 2006.