Table 4-47. Air Pollution Trends in Selected Metropolitan Statistical AreasR (Number of days with AQI values greater than 100 at trend sites and all monitoring sites).

Table 4-47. Air Pollution Trends in Selected Metropolitan Statistical AreasR (Number of days with AQI values greater than 100 at trend sites and all monitoring sites).

Excel | CSV

All sites Trend sites
Total number of sites AQI days > 100 (1998) Number of trend sites 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998
Akron, OH 6 14 5 15 9 30 8 10 8 12 11 6 14
Albany-Schenectady-Troy, NY 13 2 7 4 4 9 5 5 6 3 4 3 2
Albuquerque, NM 25 0 21 8 8 5 0 0 1 0 0 0 0
Allentown-Bethlehem-Easton, PA 9 18 9 11 10 14 3 6 10 17 6 13 18
Atlanta, GA 18 60 7 14 42 23 18 30 12 33 21 26 43
Austin-San Marcos, TX 5 6 5 4 4 3 1 2 4 12 0 0 5
Bakersfield, CA 16 78 7 113 97 109 100 97 98 104 109 55 75
Baltimore, MD 22 51 15 28 29 50 23 48 41 36 28 30 51
Baton Rouge, LA 10 21 6 12 28 11 5 5 7 15 7 8 14
Bergen-Passaic, NJ 8 0 8 12 8 11 2 3 5 11 3 5 0
Birmingham, AL 16 23 16 5 28 5 12 10 6 32 15 8 23
Boston, MA-NH 25 9 25 12 7 13 9 6 10 8 2 8 7
Buffalo-Niagara Falls, NY 21 13 21 4 8 9 3 1 4 6 3 1 13
Charleston-North Charleston, SC 9 3 9 5 1 2 0 2 2 1 3 3 3
Charlotte-Gastonia-Rock Hill, NC-SC 26 51 10 13 31 12 11 23 9 13 18 26 48
Chicago, IL 61 10 46 16 4 22 4 3 8 21 6 9 7
Cincinnati, OH-KY-IN 23 20 20 19 19 22 3 13 19 23 11 11 14
Cleveland-Lorain-Elyria, OH 40 22 24 18 10 23 11 13 23 24 17 12 20
Columbus, OH 12 23 10 7 4 17 5 7 10 15 16 8 19
Dallas, TX 11 36 8 18 24 2 11 12 15 36 12 15 18
Dayton-Springfield, OH 13 21 10 10 13 12 2 11 14 11 18 9 19
Denver, CO 29 9 20 14 9 6 8 3 1 2 0 0 5
Detroit, MI 32 17 30 18 11 28 8 5 13 14 13 12 17
El Paso, TX 22 8 17 25 19 7 10 7 11 5 7 3 5
Fort Lauderdale, FL 18 1 8 6 1 0 2 4 1 1 1 0 1
Fort Worth-Arlington, TX 8 17 8 17 16 20 7 9 31 28 14 14 17
Fresno, CA 15 69 11 91 62 83 69 59 55 61 70 75 67
Gary, IN 22 10 18 15 2 8 5 0 6 17 11 12 9
Grand Rapids-Muskegon-Holland, MI 10 19 8 16 10 26 6 3 12 17 7 8 13
Greensboro-Winston-Salem-High Pt, NC 16 30 7 6 12 5 2 20 7 6 6 13 25
Greenville-Spartanburg-Anderson, SC 7 29 5 3 2 3 5 9 5 8 7 10 29
Harrisburg-Lebanon-Carlisle, PA 7 22 7 10 10 21 1 15 12 13 3 9 22
Hartford, CT 15 10 15 19 13 23 15 14 18 14 5 16 10
Honolulu, HI 14 0 6 0 0 0 0 0 0 0 0 0 0
Houston, TX 26 40 26 43 54 37 32 28 45 66 28 47 38
Indianapolis, IN 37 22 29 15 9 12 7 9 22 19 13 12 19
Jacksonville, FL 15 10 15 4 3 0 2 3 2 1 1 4 10
Jersey City, NJ 7 7 7 15 15 25 9 19 12 16 5 9 7
Kansas City, MO-KS 22 15 21 4 2 11 1 4 10 22 10 18 15
Knoxville, TN 18 55 14 2 23 10 7 20 13 20 19 36 52
Las Vegas, NV-AZ 28 11 6 36 21 8 4 6 8 1 5 0 0
Little Rock-North Little Rock, AR 7 3 7 1 1 3 0 2 2 7 1 1 2
Los Angeles-Long Beach, CA 38 56 38 215 173 169 175 134 139 113 94 60 56
Louisville, KY-IN 26 29 18 15 10 15 2 20 27 21 10 13 24
Memphis, TN-AR-MS 14 27 13 8 24 9 14 15 10 21 19 17 27
Miami, FL 12 8 10 5 1 1 3 6 1 2 1 3 8
Middlesex-Somerset-Hunterdon, NJ 4 22 4 19 24 24 8 13 9 16 8 18 21
Milwaukee-Waukesha, WI 22 12 18 17 8 24 3 4 9 14 5 4 10
Minneapolis-St. Paul, MN-WI 37 1 24 8 4 2 3 0 4 7 1 0 0
Monmouth-Ocean, NJ 4 31 3 15 21 20 6 11 3 6 12 12 19
Nashville, TN 21 32 17 12 31 13 6 18 21 28 23 20 30
Nassau-Suffolk, NY 8 11 4 14 20 25 5 15 10 9 6 8 10
New Haven-Meriden, CT 10 10 10 11 17 29 10 17 14 14 8 19 10
New Orleans, LA 11 7 11 4 6 2 5 6 8 20 8 7 7
New York, NY 39 21 29 29 36 49 10 19 21 19 15 23 17
Newark, NJ 12 23 12 21 23 35 10 13 13 20 12 13 23
Norfolk-VA Beach-Newport News, VA-NC 12 15 12 4 8 7 8 19 6 6 4 17 15
Oakland, CA 29 12 20 6 4 4 3 4 3 12 11 0 11
Oklahoma City, OK 14 7 10 4 4 4 2 2 5 13 2 4 7
Omaha, NE-IA 12 5 9 1 1 0 0 1 1 1 1 0 5
Orange County, CA 11 6 11 56 45 35 35 25 15 9 9 3 6
Orlando, FL 13 14 9 9 4 1 4 4 3 1 1 4 11
Philadelphia, PA-NJ 44 38 36 44 39 49 24 51 26 30 22 32 37
Phoenix-Mesa, AZ 49 37 23 30 12 11 13 16 10 22 17 12 17
Pittsburgh, PA 53 39 41 21 19 21 9 13 19 25 11 20 39
Ponce, PR 1 0 1 0 0 0 0 0 0 0 0 0 0
Portland-Vancouver, OR-WA 17 3 12 2 11 8 6 0 2 2 6 0 3
Providence-Fall River-Warwick, RI-MA 13 5 11 9 13 20 5 7 7 11 4 10 4
Raleigh-Durham-Chapel Hill, NC 18 40 4 14 15 5 0 11 2 1 1 13 21
Richmond-Petersburg, VA 11 28 10 11 6 18 8 30 13 19 5 21 28
Riverside-San Bernardino, CA 51 96 35 187 158 154 174 168 149 124 119 106 94
Rochester, NY 8 4 8 5 5 16 2 0 1 6 0 6 4
Sacramento, CA 33 33 13 63 36 54 44 14 30 32 30 5 17
St. Louis, MO-IL 63 24 54 25 23 32 15 9 32 34 20 15 23
Salt Lake City-Ogden, UT 23 19 12 21 5 20 9 5 13 4 8 1 12
San Antonio, TX 7 6 7 3 4 3 1 3 4 18 3 3 6
San Diego, CA 28 35 23 127 96 67 66 58 46 48 31 14 33
San Francisco, CA 11 0 9 0 0 0 0 0 0 2 0 0 0
San Jose, CA 11 8 8 18 7 11 3 4 2 10 7 0 5
San Juan-Bayamon, PR 27 1 10 0 0 0 0 0 0 0 1 2 1
Scranton-Wilkes Barre-Hazleton, PA 11 7 11 6 9 17 3 10 7 12 4 11 7
Seattle-Bellevue-Everett, WA 26 3 16 6 9 4 3 0 3 0 6 1 3
Springfield, MA 13 7 13 10 13 15 12 13 12 9 5 10 7
Syracuse, NY 8 3 6 2 1 11 2 4 0 1 0 0 2
Tacoma, WA 9 4 7 3 5 1 2 0 2 0 1 0 4
Tampa-St. Petersburg-Clearwater, FL 32 11 22 4 6 1 1 1 3 2 3 4 11
Toledo, OH 6 6 6 8 3 6 2 7 9 9 11 4 5
Tucson, AZ 25 0 20 2 1 0 1 1 1 3 0 1 0
Tulsa, OK 11 9 11 5 16 12 1 4 12 21 14 7 9
Ventura, CA 15 30 12 87 70 87 54 37 63 65 62 44 29
Washington, DC-MD-VA-WV 46 47 32 24 25 48 14 48 20 29 18 29 45
West Palm Beach-Boca Raton, FL 9 2 6 1 0 0 0 3 0 0 0 0 2
Wilmington-Newark, DE-MD 10 28 5 12 9 12 7 10 5 12 3 6 8
Youngstown-Warren, OH 15 22 9 8 3 14 5 2 0 11 5 3 15

KEY: R = Revised.

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) 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. In 1997, 4,738 monitoring sites reported air  quality data. Air quality monitoring sites are selected as "trend sites" if they have complete data for at least 8 of the 10 years between 1989 and 1998.

SOURCE: U.S. Environmental Protection Agency, Office of Air Quality Planning and Standards, National Air Quality and Emissions Trends Report, 1998 (Research Triangle Park, NC: 2000), table A-15.