Demographia

Air Pollution Trends in US Metropolitan Areas: 1988-1997

Number of Days with PSI Values Greater than 100 at Trend Sites
Metropolitan Area 1988 1997 Change 1988 Rank (Best to Worst) 1997 Rank (Best to Worst) Rank: Change
Akron, OH 46 6 -87.0% 75 37 24
Albany-Schenectady-Troy, NY 23 3 -87.0% 30 22 24
Albuquerque, NM 9 0 -100.0% 17 1 1
Allentown-Bethlehem-Easton, PA 35 13 -62.9% 53 61 58
Atlanta, GA 44 26 -40.9% 71 81 79
Austin-San Marcos, TX 7 0 -100.0% 11 1 1
Bakersfield, CA 126 55 -56.3% 90 90 65
Baltimore, MD 60 30 -50.0% 84 84 70
Baton Rouge, LA 17 8 -52.9% 26 43 69
Bergen-Passaic, NJ 27 5 -81.5% 40 35 28
Birmingham, AL 33 8 -75.8% 51 43 35
Boston, MA-NH 28 8 -71.4% 42 43 45
Buffalo-Niagara Falls, NY 31 1 -96.8% 50 16 15
Charleston-North Charleston, SC 11 3 -72.7% 22 22 43
Charlotte-Gastonia-Rock Hill, NC-SC 43 26 -39.5% 69 81 81
Chicago, IL 40 9 -77.5% 66 47 33
Cincinnati, OH-KY-IN 57 11 -80.7% 82 55 29
Cleveland-Lorain-Elyria, OH 45 12 -73.3% 74 56 42
Columbus, OH 24 5 -79.2% 34 35 31
Dallas, TX 37 15 -59.5% 59 69 61
Dayton-Springfield, OH 37 9 -75.7% 59 47 36
Denver, CO 35 0 -100.0% 53 1 1
Detroit, MI 35 12 -65.7% 53 56 54
El Paso, TX 15 3 -80.0% 24 22 30
Fort Lauderdale, FL 3 0 -100.0% 7 1 1
Fort Worth-Arlington, TX 27 14 -48.1% 40 66 75
Fresno, CA 110 50 -54.5% 88 89 67
Gary, IN 37 12 -67.6% 59 56 52
Grand Rapids-Muskegon-Holland, MI 36 6 -83.3% 58 37 26
Greensboro-Winston-Salem-High Pt, NC 46 13 -71.7% 75 61 44
Greenville-Spartanburg-Anderson, SC 35 9 -74.3% 53 47 39
Harrisburg-Lebanon-Carlisle, PA 39 9 -76.9% 63 47 34
Hartford, CT 39 16 -59.0% 63 73 63
Honolulu, HI 0 0 0.0% 1 1 86
Houston, TX 72 47 -34.7% 85 88 83
Indianapolis, IN 39 12 -69.2% 63 56 49
Jacksonville, FL 4 4 0.0% 8 30 86
Jersey City, NJ 30 9 -70.0% 47 47 46
Kansas City, MO-KS 23 18 -21.7% 30 74 85
Knoxville, TN 33 36 9.1% 51 86 90
Las Vegas, NV-AZ 30 0 -100.0% 47 1 1
Little Rock-North Little Rock, AR 9 1 -88.9% 17 16 21
Los Angeles-Long Beach, CA 239 63 -73.6% 92 91 40
Louisville, KY-IN 49 13 -73.5% 77 61 41
Memphis, TN-AR-MS 44 14 -68.2% 71 66 51
Miami, FL 8 3 -62.5% 14 22 59
Middlesex-Somerset-Hunterdon, NJ 35 18 -48.6% 53 74 73
Milwaukee-Waukesha, WI 40 4 -90.0% 66 30 19
Minneapolis-St. Paul, MN-WI 11 0 -100.0% 22 1 1
Monmouth-Ocean, NJ 0 12 0.0% 1 56 86
Nashville, TN 55 20 -63.6% 79 77 56
Nassau-Suffolk, NY 22 8 -63.6% 29 43 56
New Haven-Meriden, CT 26 19 -26.9% 39 76 84
New Orleans, LA 24 6 -75.0% 34 37 37
New York, NY 57 23 -59.6% 82 80 60
Newark, NJ 41 13 -68.3% 68 61 50
Norfolk-VA Beach-Newport News, VA-NC 23 15 -34.8% 30 69 82
Oakland, CA 8 0 -100.0% 14 1 1
Oklahoma City, OK 8 4 -50.0% 14 30 70
Omaha, NE-IA 7 0 -100.0% 11 1 1
Orange County, CA 56 3 -94.6% 80 22 17
Orlando, FL 2 4 100.0% 6 30 91
Philadelphia, PA-NJ 53 32 -39.6% 78 85 80
Phoenix-Mesa, AZ 29 15 -48.3% 44 69 74
Pittsburgh, PA 43 20 -53.5% 69 77 68
Portland-Vancouver, OR-WA 9 0 -100.0% 17 1 1
Providence-Fall River-Warwick, RI-MA 18 10 -44.4% 27 53 76
Raleigh-Durham-Chapel Hill, NC 4 13 225.0% 8 61 92
Richmond-Petersburg, VA 37 21 -43.2% 59 79 77
Riverside-San Bernardino, CA 185 106 -42.7% 91 92 78
Rochester, NY 24 6 -75.0% 34 37 37
Sacramento, CA 88 2 -97.7% 86 21 14
St. Louis, MO-IL 44 15 -65.9% 71 69 53
Salt Lake City-Ogden, UT 16 1 -93.8% 25 16 18
San Antonio, TX 7 3 -57.1% 11 22 64
San Diego, CA 123 14 -88.6% 89 66 22
San Francisco, CA 1 0 -100.0% 4 1 1
San Jose, CA 24 0 -100.0% 34 1 1
Scranton-Wilkes Barre-Hazleton, PA 30 9 -70.0% 47 47 46
Seattle-Bellevue-Everett, WA 20 1 -95.0% 28 16 16
Springfield, MA 29 10 -65.5% 44 53 55
Syracuse, NY 1 0 -100.0% 4