Table 7-7: Air Pollution in the 50 Largest Metropolitan Areas: 2008–2013
Tuesday, September 16, 2014
(Number of days with AQI value greater than 100)
| Metropolitan area | AQI days > 100 | |||||
|---|---|---|---|---|---|---|
| 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | |
| Atlanta-Sandy Springs-Roswell, GA | 34 | 18 | 29 | 46 | 19 | 3 |
| Austin-Round Rock, TX | 2 | 5 | 3 | 7 | 4 | 1 |
| Baltimore-Columbia-Towson, MD | 25 | 15 | 36 | 25 | 20 | 5 |
| Birmingham-Hoover, AL | 22 | 5 | 15 | 23 | 10 | 1 |
| Boston-Cambridge-Newton, MA-NH | 11 | 5 | 5 | 3 | 6 | 5 |
| Buffalo-Cheektowaga-Niagara Falls, NY | 4 | 2 | 3 | 2 | 8 | 1 |
| Charlotte-Concord-Gastonia, NC-SC | 26 | 4 | 15 | 18 | 11 | 0 |
| Chicago-Naperville-Elgin, IL-IN-WI | 56 | 34 | 38 | 27 | 47 | 12 |
| Cincinnati, OH-KY-IN | 23 | 11 | 30 | 47 | 43 | 11 |
| Cleveland-Elyria, OH | 61 | 63 | 74 | 75 | 59 | 13 |
| Columbus, OH | 11 | 1 | 8 | 11 | 14 | 2 |
| Dallas-Fort Worth-Arlington, TX | 34 | 34 | 18 | 40 | 36 | 33 |
| Denver-Aurora-Lakewood, CO | 33 | 8 | 17 | 21 | 26 | 23 |
| Detroit-Warren-Dearborn, MI | 21 | 12 | 27 | 20 | 38 | 7 |
| Hartford-West Hartford-East Hartford, CT | 10 | 3 | 9 | 8 | 16 | 11 |
| Houston-The Woodlands-Sugar Land, TX | 33 | 31 | 35 | 38 | 34 | 19 |
| Indianapolis-Carmel-Anderson, IN | 19 | 20 | 20 | 31 | 29 | 11 |
| Jacksonville, FL | 10 | 4 | 18 | 19 | 5 | 2 |
| Kansas City, MO-KS | 40 | 46 | 25 | 53 | 72 | 42 |
| Las Vegas-Henderson-Paradise, NV | 12 | 8 | 11 | 25 | 29 | 16 |
| Los Angeles-Long Beach-Anaheim, CA | 107 | 112 | 85 | 105 | 106 | 80 |
| Louisville/Jefferson County, KY-IN | 62 | 35 | 55 | 36 | 45 | 18 |
| Memphis, TN-MS-AR | 11 | 4 | 14 | 22 | 20 | 2 |
| Miami-Fort Lauderdale-West Palm Beach, FL | 6 | 2 | 4 | 9 | 2 | 3 |
| Milwaukee-Waukesha-West Allis, WI | 5 | 7 | 9 | 5 | 26 | 0 |
| Minneapolis-St. Paul-Bloomington, MN-WI | 4 | 8 | 9 | 2 | 5 | 2 |
| Nashville-Davidson--Murfreesboro--Franklin, TN | 12 | 1 | 10 | 13 | 23 | 1 |
| New Orleans-Metairie, LA | 82 | 95 | 68 | 89 | 44 | 25 |
| New York-Newark-Jersey City, NY-NJ-PA | 44 | 26 | 41 | 29 | 22 | 15 |
| Oklahoma City, OK | 5 | 5 | 3 | 27 | 23 | 3 |
| Orlando-Kissimmee-Sanford, FL | 2 | 1 | 2 | 8 | 1 | 0 |
| Philadelphia-Camden-Wilmington, PA-NJ-DE-MD | 39 | 15 | 38 | 20 | 27 | 11 |
| Phoenix-Mesa-Scottsdale, AZ | 191 | 67 | 44 | 121 | 94 | 87 |
| Pittsburgh, PA | 99 | 69 | 82 | 54 | 59 | 18 |
| Portland-Vancouver-Hillsboro, OR-WA | 9 | 15 | 2 | 17 | 2 | 16 |
| Providence-Warwick, RI-MA | 7 | 2 | 16 | 11 | 14 | 9 |
| Raleigh, NC | 11 | 0 | 3 | 7 | 5 | 0 |
| Richmond, VA | 19 | 1 | 11 | 12 | 12 | 1 |
| Riverside-San Bernardino-Ontario, CA | 153 | 145 | 139 | 151 | 153 | 130 |
| Sacramento--Roseville--Arden-Arcade, CA | 65 | 46 | 24 | 60 | 51 | 35 |
| Salt Lake City, UT | 26 | 30 | 21 | 22 | 11 | 45 |
| San Antonio-New Braunfels, TX | 11 | 3 | 4 | 12 | 8 | 10 |
| San Diego-Carlsbad, CA | 47 | 30 | 19 | 13 | 22 | 19 |
| San Francisco-Oakland-Hayward, CA | 19 | 14 | 10 | 8 | 5 | 7 |
| San Jose-Sunnyvale-Santa Clara, CA | 19 | 9 | 10 | 4 | 4 | 8 |
| Seattle-Tacoma-Bellevue, WA | 10 | 21 | 1 | 13 | 9 | 8 |
| St. Louis, MO-IL | 119 | 93 | 87 | 78 | 97 | 35 |
| Tampa-St. Petersburg-Clearwater, FL | 24 | 18 | 12 | 14 | 13 | 3 |
| Virginia Beach-Norfolk-Newport News, VA-NC | 19 | 0 | 8 | 11 | 4 | 0 |
| Washington-Arlington-Alexandria, DC-VA-MD-WV | 24 | 7 | 34 | 21 | 24 | 5 |
KEY: AQI = Air Quality Index
NOTES: Historical data are reviesd. Air Quality Index (AQI) is an indicator of overall air quality and takes into account all of the criteria air pollutants measured within a geographic area. Although AQI includes all available pollutant measurements, areas may have monitoring stations for some, but not all, pollutants. An AQI value greater than 100 is considered unhealthy. Metropolitan area rank is based on 2010 U.S. Census population.
SOURCE: U.S. Environmental Protection Agency, AirData, available at www.epa.gov/airquality/airdata as of June 2014.