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

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

(Number of days with AQI values greater than 100)

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Metropolitan area AQI days > 100
1999 2000 2001 2002 2003
Atlanta, GA 66 30 14 30 11
Austin-San Marcos, TX 8 6 0 5 3
Baltimore, MD 40 16 26 39 10
Boston, MA-NH 8 1 12 13 3
Buffalo-Niagara Falls, NY 8 5 13 21 7
Chicago, IL 14 1 16 20 4
Cincinnati, OH-KY-IN 26 9 6 26 7
Cleveland-Lorain-Elyria, OH 20 4 17 29 6
Columbus, OH 21 6 7 19 5
Dallas, TX 25 22 16 15 12
Denver, CO 3 2 2 7 17
Detroit, MI 14 3 16 21 7
Fort Lauderdale, FL 1 1 2 1 0
Honolulu, HI 2 2 2 2 U
Houston, TX 51 43 28 23 30
Indianapolis, IN 24 4 8 23 11
Jacksonville, FL 2 0 0 0 0
Kansas City, MO-KS 3 10 4 7 10
Las Vegas, NV-AZ 0 0 1 2 2
Los Angeles-Long Beach, CA 19 45 37 35 61
Louisville, KY-IN 44 10 10 26 7
Memphis, TN-AR-MS 35 24 13 16 9
Miami, FL 5 0 1 0 1
Milwaukee-Waukesha, WI 17 4 12 12 8
Minneapolis-St. Paul, MN-WI 0 0 2 1 1
New Orleans, LA 18 17 5 2 8
New York, NY 25 11 16 30 7
Norfolk-VA Beach-Newport News, VA-NC 16 5 6 15 4
Oklahoma City, OK 4 6 2 2 2
Orlando, FL 4 3 3 1 0
Philadelphia, PA-NJ 32 17 27 33 13
Phoenix-Mesa, AZ 10 9 6 6 7
Pittsburgh, PA 23 4 19 28 7
Portland-Vancouver, OR-WA 0 0 0 1 0
Providence-Fall River-Warwick, RI-MA 2 2 10 9 4
Richmond-Petersburg, VA 21 5 12 21 3
Riverside-San Bernardino, CA 96 98 92 96 102
Sacramento, CA 40 31 35 39 36
St. Louis, MO-IL 29 16 14 32 11
Salt Lake City-Ogden, UT 4 7 4 7 3
San Antonio, TX 9 0 0 17 4
San Diego, CA 16 14 17 13 6
San Francisco, CA 0 0 0 0 0
San Jose, CA 3 1 3 6 6
Seattle-Bellevue-Everett, WA 0 0 0 0 0
Tampa-St. Petersburg-Clearwater, FL 9 6 4 0 4
Tucson, AZ 1 0 0 1 1
Tulsa, OK 13 10 4 5 7
Washington, DC-MD-VA-WV 39 11 22 34 8
West Palm Beach-Boca Raton, FL 1 0 1 0 0

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

NOTES: The Air Quality Index (AQI) integrates information on 5 major pollutants (particulate matter less than 10 microns in diameter, sulfur dioxide, carbon monoxide, ozone, and nitrogen dioxide, and for 2000-2003 particulate matter less than 2.5 microns in diameter is also included as a sixth major pollutant) 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.

SOURCES:
All data except Honolulu:
U.S. Environmental Protection Agency, Office of Air and Radiation, Air Trends, Factbook and Related Information, available at http://www.epa.gov/airtrends/aqi10year.pdf as of Aug. 25, 2004.
Honolulu: U.S. Environmental Protection Agency, Office of Air Quality Planning and Standards, National Air Quality and Emissions Trends Report, 2002 (Research Triangle Park, NC: 2003), table A-17. Available at http://www.epa.gov/airtrends/table_a-17_2002.pdf as of Sept. 30, 2003.