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

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  All sites Trend sites
Total number of sitesR AQI days > 100 (2001) Number of trend sitesR 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001
Akron, OH 2 12 2 8 10 8 12 11 6 14 20 4 12
Albany-Schenectady-Troy, NY 3 11 3 5 5 6 3 4 3 2 6 1 11
Albuquerque, NM 1 1 1 0 0 1 0 0 0 0 1 0 1
Allentown-Bethlehem-Easton, PA 3 15 2 3 6 3 9 6 13 18 20 5 9
Atlanta, GA 12 18 3 20 36 15 35 25 31 50 61 26 8
Austin-San Marcos, TX 1 1 0 1 2 4 10 0 0 5 8 6 0
Bakersfield, CA 8 33 7 100 97 R104 R107 R110 R58 76 R94 82 33
Baltimore, MD 8 26 7 23 48 R40 36 28 30 51 40 16 26
Baton Rouge, LA 6 5 6 R6 R13 R10 R21 R11 R16 R16 R23 29 5
Bergen-Passaic, NJ 2 5 0 R0 R0 R0 R0 R0 R0 R1 0 0 0
Birmingham, AL 6 12 6 12 10 6 32 15 8 R22 27 22 12
Boston, MA-NH 5 18 3 R6 R2 R6 R7 R4 R7 R8 R8 1 14
Buffalo-Niagara Falls, NY 2 13 2 3 1 4 6 3 1 13 8 5 13
Charleston-North Charleston, SC 0 0 0 0 2 2 1 3 3 3 5 4 0
Charlotte-Gastonia-Rock Hill, NC-SC 7 26 6 11 R29 R15 R19 R23 R30 R49 R40 22 23
Chicago, IL 19 16 19 R6 3 R9 R24 R7 9 R10 R14 0 15
Cincinnati, OH-KY-IN 8 12 5 1 R5 16 19 10 11 R13 12 4 6
Cleveland-Lorain-Elyria, OH 9 24 8 11 R16 R25 R27 R19 R13 R22 R21 5 17
Columbus, OH 7 9 4 5 R8 R12 R18 R19 R13 R21 R22 6 7
Dallas, TX 8 24 2 R8 R13 R26 R28 R10 20 R26 23 20 14
Dayton-Springfield, OH 5 5 4 2 11 14 11 18 R10 19 19 6 4
Denver, CO 6 2 6 11 R6 R3 R5 R1 0 R9 R4 2 2
Detroit, MI 7 16 7 7 5 11 14 13 R11 17 15 3 16
El Paso, TX 4 8 4 10 7 R9 R7 R5 R3 6 R1 3 5
Fort Lauderdale, FL 2 2 2 2 4 1 1 1 0 1 1 1 2
Fort Worth-Arlington, TX 7 25 2 7 9 31 28 14 14 17 19 16 17
Fresno, CA 7 85 6 69 59 55 61 70 75 67 81 78 85
Gary, IN 4 10 2 5 0 6 17 11 R11 9 10 5 9
Grand Rapids-Muskegon-Holland, MI 5 11 4 R5 3 R14 R18 R9 R10 R19 R21 3 11
Greensboro-Winston-Salem-High Pt., NC 7 20 4 2 R22 7 R13 R7 R14 25 R24 12 12
Greenville-Spartanburg-Anderson, SC 4 13 4 5 R8 5 R7 7 R9 28 19 11 13
Harrisburg-Lebanon-Carlisle, PA 3 17 3 1 15 12 13 3 9 22 17 5 17
Hartford, CT 3 16 3 15 14 18 14 5 16 10 18 7 16
Honolulu, HI 0 0 0 0 0 0 0 0 0 0 0 0 0
Houston, TX 16 37 9 32 R27 R41 66 R28 47 R29 R52 41 28
Indianapolis, IN 11 10 7 R6 9 22 R21 R16 12 19 R24 4 8
Jacksonville, FL 2 1 2 2 3 2 1 1 4 R2 3 0 1
Jersey City, NJ 1 3 1 11 19 17 18 5 9 7 17 3 3
Kansas City, MO-KS 4 4 4 1 R3 10 R21 R7 R16 R14 5 10 4
Knoxville, TN 7 17 7 7 25 16 R26 R21 R37 54 R62 36 17
Las Vegas, NV-AZ 6 5 3 R3 R3 R3 0 R4 0 R3 0 0 1
Little Rock-North Little Rock, AR 2 4 2 0 2 2 7 1 1 R3 R5 16 4
Los Angeles-Long Beach, CA 14 36 14 175 134 139 113 94 60 56 27 48 30
Louisville, KY-IN 6 10 6 2 23 R28 R24 11 R18 R29 R44 10 10
Memphis, TN-AR-MS 4 13 4 14 15 10 21 19 17 R26 R35 24 13
Miami, FL 4 1 4 3 6 1 2 1 3 R6 5 0 1
Middlesex-Somerset-Hunterdon, NJ 2 11 2 8 13 9 R20 R15 R19 R22 R26 11 11
Milwaukee-Waukesha, WI 9 12 9 3 4 R12 14 5 R5 R12 R18 4 12
Minneapolis-St. Paul, MN-WI 3 3 2 1 0 2 5 0 0 1 0 0 2
Monmouth-Ocean, NJ 2 13 2 11 24 13 20 17 21 31 27 11 13
Nashville, TN 6 7 6 6 R19 21 26 R23 20 30 33 16 7
Nassau-Suffolk, NY 3 9 2 7 17 15 10 8 12 11 18 5 3
New Haven-Meriden, CT 2 13 2 10 R13 R13 14 8 19 10 16 6 11
New Orleans, LA 6 5 6 5 6 8 20 8 7 R4 18 17 5
New York, NY 8 20 4 R4 R11 R16 R20 R14 23 R16 R25 11 16
Newark, NJ 2 10 2 10 13 13 20 12 13 23 21 7 10
Norfolk-VA Beach-Newport News, VA-NC 3 6 3 8 19 6 6 4 17 15 16 5 6
Oakland, CA 7 4 7 R4 4 3 12 11 0 R12 R6 3 3
Oklahoma City, OK 4 2 4 2 2 5 13 2 4 R6 6 6 2
Omaha, NE-IA 1 1 1 0 1 1 1 R0 0 R1 5 1 1
Orange County, CA 4 4 4 35 25 15 9 9 3 6 1 4 2
Orlando, FL 4 3 4 4 4 3 1 1 R5 R9 4 3 3
Philadelphia, PA-NJ 12 25 12 R27 R62 R37 R38 R38 R38 37 32 18 22
Phoenix-Mesa, AZ 12 18 7 R11 R15 R9 22 R15 12 R14 R10 10 6
Pittsburgh, PA 13 20 9 9 R15 R21 R26 11 R20 39 R24 4 18
Ponce, PR 0 0 0 0 0 0 0 0 0 0 0 0 0
Portland-Vancouver, OR-WA 3 2 3 6 0 2 2 6 0 3 2 0 2
Providence-Fall River-Warwick, RI-MA 2 13 1 R0 R0 R5 R7 R2 R3 R2 R2 2 10
Raleigh-Durham-Chapel Hill, NC 6 9 6 0 R17 R15 R12 R13 R21 R37 R29 12 8
Richmond-Petersburg, VA 4 14 4 8 30 13 19 5 21 28 25 5 12
Riverside-San Bernardino, CA 20 97 20 174 168 R150 124 R118 105 R94 R96 100 94
Rochester, NY 2 5 2 2 0 1 6 0 6 4 9 1 5
Sacramento, CA 11 25 10 R50 20 R37 41 R44 R17 R29 R39 29 17
St. Louis, MO-IL 15 15 15 15 9 R33 R36 20 15 23 29 14 15
Salt Lake City-Ogden, UT 6 6 6 R8 R4 R10 R5 R14 R2 R19 R4 2 4
San Antonio, TX 1 1 0 R0 3 R3 R17 R2 3 R4 9 0 0
San Diego, CA 9 17 9 66 R59 46 48 31 14 33 16 14 17
San Francisco, CA 0 0 0 0 0 0 2 0 0 0 0 0 0
San Jose, CA 6 3 6 3 4 2 R14 R8 0 R8 R4 1 3
San Juan-Bayamon, PR 0 0 0 0 0 0 0 R0 R0 R0 R0 0 0
Scranton-Wilkes Barre-Hazleton, PA 4 10 4 3 10 7 12 4 11 7 12 1 10
Seattle-Bellevue-Everett, WA 2 1 0 R5 0 3 R2 6 1 3 1 1 0
Springfield, MA 4 13 4 12 13 12 9 5 10 7 10 2 13
Syracuse, NY 2 4 2 2 4 1 5 0 2 3 4 1 4
Tacoma, WA 0 0 0 2 0 2 0 1 0 4 0 0 0
Tampa-St. Petersburg-Clearwater, FL 9 6 7 2 1 3 2 3 4 R6 9 6 4
Toledo, OH 4 11 2 2 7 R8 9 11 4 5 4 2 9
Tucson, AZ 0 0 0 1 1 0 3 0 1 0 R1 0 0
Tulsa, OK 5 7 3 1 4 12 21 14 7 9 14 7 4
Ventura, CA 6 23 6 54 43 63 66 62 45 29 22 27 18
Washington, DC-MD-VA-WV 20 23 16 14 52 R22 R32 18 R30 47 39 11 22
West Palm Beach-Boca Raton, FL 2 1 2 0 3 0 0 0 0 2 1 0 1
Wilmington-Newark, DE-MD 5 20 4 12 29 24 27 13 R22 R28 21 18 19
Youngstown-Warren, OH 3 12 3 10 10 5 12 8 10 22 12 2 12

KEY: AQI = Air Quality Index; 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 1999, 4,184 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 1992 and 2001.

SOURCE

U.S. Environmental Protection Agency, Office of Air Quality Planning and Standards, National Air Quality and Emissions Trends Report, 2000 (Research Triangle Park, NC: 2002), table A-16.