Table 7-7: Air Pollution in the 50 Largest Metropolitan Areas: 2003–2010

Wednesday, January 29, 2014

(Number of days with AQI values greater than 100)

Metropolitan area	AQI days > 100
Metropolitan area	2003	2004	2005	2006	2007	2008	2009	2010
Atlanta-Sandy Springs-Marietta, GA	61	36	32	52	65	56	31	16
Austin-Round Rock, TX	8	10	10	11	14	4	2	4
Baltimore-Towson, MD	59	30	31	36	33	45	23	11
Birmingham-Hoover, AL	39	38	18	42	43	44	15	5
Boston-Cambridge-Quincy, MA-NH	42	16	9	21	10	21	9	5
Buffalo-Niagara Falls, NY	29	13	8	23	7	27	4	1
Charlotte-Gastonia-Concord, NC-SC	51	16	20	32	24	36	24	3
Chicago-Naperville-Joliet, IL-IN-WI	56	44	47	61	35	53	48	26
Cincinnati-Middletown, OH-KY-IN	80	52	56	67	38	50	14	7
Cleveland-Elyria-Mentor, OH	92	74	63	98	71	69	58	6
Columbus, OH	46	23	13	32	11	30	10	1
Dallas-Fort Worth-Arlington, TX	54	49	50	80	54	34	30	32
Denver-Aurora, CO	31	35	6	13	27	23	10	7
Detroit-Warren-Livonia, MI	54	37	37	62	38	35	24	9
Hartford-West Hartford-East Hartford, CT	34	13	11	19	15	24	10	3
Houston-Sugar Land-Baytown, TX	62	74	66	93	64	47	24	26
Indianapolis-Carmel, IN	53	38	22	49	30	42	8	10
Jacksonville, FL	57	10	15	20	35	16	10	3
Kansas City, MO-KS	38	56	35	52	74	44	39	43
Las Vegas-Paradise, NV	36	42	22	34	35	24	12	5
Los Angeles-Long Beach-Santa Ana, CA	154	147	134	113	98	102	94	99
Louisville/Jefferson County, KY-IN	82	67	69	88	68	99	58	35
Memphis, TN-MS-AR	41	40	14	49	33	33	10	4
Miami-Fort Lauderdale-Pompano Beach, FL	5	4	11	4	12	10	5	2
Milwaukee-Waukesha-West Allis, WI	23	18	7	22	6	14	3	5
Minneapolis-St. Paul-Bloomington, MN-WI	5	18	11	11	1	5	1	3
Nashville-Davidson-Murfreesboro-Franklin, TN	38	23	7	29	17	37	11	1
New Orleans-Metairie-Kenner, LA	4	15	12	13	13	17	2	6
New York-Northern New Jersey-Long Island, NY-NJ-PA	68	41	40	50	40	40	31	15
Oklahoma City, OK	16	16	6	15	33	5	5	5
Orlando-Kissimmee, FL	7	8	6	10	8	11	2	1
Philadelphia-Camden-Wilmington, PA-NJ-DE-MD	100	76	39	62	55	46	30	7
Phoenix-Mesa-Scottsdale, AZ	49	51	23	49	50	21	27	10
Pittsburgh, PA	162	129	118	123	94	97	81	58
Portland-Vancouver-Beaverton, OR-WA	7	2	4	4	2	5	3	5
Providence-New Bedford-Fall River, RI-MA	39	19	10	22	16	21	6	2
Raleigh-Cary, NC	45	11	10	26	9	24	11	0
Richmond, VA	55	28	18	41	21	37	19	1
Riverside-San Bernardino-Ontario, CA	180	163	157	142	133	144	131	114
Sacramento--Arden-Arcade--Roseville, CA	103	79	66	62	79	53	61	43
Salt Lake City, UT	41	23	38	33	26	35	19	22
San Antonio, TX	27	21	15	15	21	3	9	3
San Diego-Carlsbad-San Marcos, CA	40	50	31	30	39	34	43	25
San Francisco-Oakland-Fremont, CA	29	15	11	7	21	6	13	7
San Jose-Sunnyvale-Santa Clara, CA	24	14	8	4	14	3	13	8
Seattle-Tacoma-Bellevue, WA	16	16	7	7	14	10	7	12
St. Louis, MO-IL	90	71	38	82	31	40	24	11
Tampa-St. Petersburg-Clearwater, FL	106	87	50	47	38	47	24	18
Virginia Beach-Norfolk-Newport News, VA-NC	33	10	6	12	13	11	16	0
Washington-Arlington-Alexandria, DC-VA-MD-WV	62	32	32	49	37	43	22	5

KEY: AQI = Air Quality Index

NOTES: The Air Quality Index (AQI) integrates information on six major pollutants (particulate matter less than 10 microns in diameter, particulate matter less than 2.5 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. Metropolitan area rank is based on U.S. Census Bureau's population estimates for July 1, 2000 and geographic definitions for 2000 available at http://www.census.gov/popest/data/index.html as of May 3, 2012. The U.S. Environmental Protection Agency reports data for metropolitan areas as they were defined in 2000.

SOURCE: U.S. Environmental Protection Agency, Office of Air and Radiation, Air Trends, Air Quality Index Information available at www.epa.gov/airtrends/aqi_info.html as of June 2013.

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Table 7-7: Air Pollution in the 50 Largest Metropolitan Areas: 2003–2010