RITA | BTS | Table 4-51: Air Pollution Trends in Selected Metropolitan Statistical Areas

Table 4-51: Air Pollution Trends in Selected Metropolitan Statistical Areas

(Number of days with AQI values greater than 100 at trend sites and all monitoring sites)

Metropolitan Statistical Area	All sites		Trend sites
	(R) Total number of sites in 2010	(R) Number of days with AQI > 100 (2010)	(R) Number of trend sites	Number of days with AQI > 100
	(R) Total number of sites in 2010	(R) Number of days with AQI > 100 (2010)	(R) Number of trend sites	1994	1995	1996	1997	1998	1999	2000	2001	2002	2003	2004	2005	2006	2007	2008	2009	2010
Akron, OH	18	4	7	69	49	66	72	73	83	52	71	82	57	60	62	34	23	8	0	4
Albany-Schenectady-Troy, NY	26	4	7	13	12	9	8	9	15	(R) 4	18	(R) 18	(R) 10	5	(R) 9	(R) 3	(R) 15	(R) 8	1	4
Albuquerque, NM	77	2	15	5	4	5	2	3	6	8	2	11	15	5	9	3	1	0	0	1
Allentown-Bethlehem-Easton, PA	28	18	5	17	18	19	23	39	32	16	34	38	14	13	18	10	12	10	1	12
Atlanta-Sandy Springs-Marietta, GA	64	27	17	35	57	50	61	84	97	72	42	44	24	22	32	46	40	25	11	14
Austin-Round Rock, TX	25	3	1	8	28	5	2	9	14	14	5	8	9	8	9	13	4	2	4	2
Bakersfield, CA	57	84	14	129	133	127	94	104	(R) 158	(R) 162	158	(R) 185	(R) 165	(R) 159	(R) 119	137	(R) 129	(R) 145	123	84
Baltimore-Towson, MD	73	33	16	62	57	43	46	70	55	37	50	59	30	31	36	33	45	23	11	33
Baton Rouge, LA	53	33	18	50	60	44	56	52	61	72	39	49	43	54	90	48	44	31	28	25
Bergen-Passaic, NJ	20	22	6	0	0	0	0	1	2	1	1	1	2	1	4	2	1	U	U	U
Birmingham-Hoover, AL	60	15	21	37	50	26	30	40	71	89	44	28	31	17	37	36	41	12	5	13
Boston-Cambridge-Quincy, MA-NH	125	5	15	10	1	2	1	3	(R) 8	0	4	(R) 11	8	1	4	1	3	0	0	1
Bradenton-Sarasota-Venice, FL	29	2	3	7	6	3	14	15	(R) 10	16	14	3	10	18	11	5	4	5	1	1
Bridgeport-Stamford-Norwalk, CT	38	17	10	39	28	22	31	37	29	22	33	41	19	11	25	21	27	19	5	17
Buffalo-Niagara Falls, NY	41	3	9	(R) 14	(R) 13	(R) 10	(R) 7	(R) 27	(R) 22	(R) 11	(R) 27	(R) 29	(R) 13	(R) 8	(R) 23	(R) 7	(R) 27	4	1	2
Charleston-North Charleston, SC	28	0	8	10	1	7	7	12	13	9	0	4	3	3	8	9	5	1	0	0
Charlotte-Gastonia-Concord, NC-SC	52	14	7	15	32	40	41	67	62	38	31	41	12	16	25	21	33	16	2	14
Chicago-Naperville-Joliet, IL-IN-WI	231	28	59	69	80	47	57	84	81	51	86	46	37	28	53	28	52	46	24	28
Cincinnati-Middletown, OH-KY-IN	109	27	20	(R) 37	(R) 39	(R) 36	(R) 31	(R) 44	(R) 52	(R) 28	(R) 39	(R) 47	(R) 28	(R) 16	(R) 41	(R) 19	(R) 42	14	5	16
Cleveland-Elyria-Mentor, OH	91	73	24	153	116	109	80	94	120	61	62	86	72	62	89	64	60	54	3	16
Columbia, SC	43	9	7	11	15	23	28	45	37	26	24	23	14	17	22	18	14	14	3	9
Columbus, OH	32	6	7	23	27	26	17	40	37	16	20	38	12	3	20	5	13	4	1	2
Dallas-Fort Worth-Arlington, TX	135	18	10	56	60	35	47	58	41	54	43	40	40	32	56	39	16	20	19	11
Dayton, OH	23	13	4	12	10	17	11	9	17	3	8	19	2	0	10	1	3	0	1	1
Denver-Aurora, CO	88	11	17	31	17	24	20	22	11	15	19	15	23	4	10	21	16	4	4	4
Detroit-Warren-Livonia, MI	75	23	22	31	37	43	29	50	72	38	58	54	37	37	62	38	35	24	9	23
El Paso, TX	63	9	13	49	72	61	27	33	8	16	14	15	13	5	10	10	8	8	2	3
Fort Lauderdale, FL	36	7	12	3	3	2	3	9	7	5	5	3	0	1	1	4	7	U	U	U
Fort Worth-Arlington, TX	37	21	6	53	52	28	27	32	33	38	31	37	38	25	43	34	12	U	U	U
Fresno, CA	41	62	20	90	91	105	118	86	164	164	186	204	167	84	95	97	93	89	80	62
Gary, IN	63	16	16	12	30	17	15	22	33	18	45	27	15	8	19	3	11	U	U	U
Grand Rapids-Wyoming, MI	13	2	6	14	15	11	9	4	(R) 11	6	(R) 16	17	10	3	16	(R) 8	8	1	1	1
Greensboro-Winston Salem-High Point, NC	62	39	5	20	25	18	30	48	38	29	22	42	13	5	14	8	21	U	U	U
Greenville-Mauldin-Easley, SC	26	3	5	3	15	17	13	18	36	20	24	28	7	2	11	10	8	6	0	1
Harrisburg-Carlisle, PA	16	5	8	33	33	18	23	38	33	19	42	37	16	10	22	14	20	13	0	4
Hartford-West Hartford-East Hartford, CT	35	9	6	25	28	14	19	26	26	14	27	34	13	11	19	15	24	10	3	9
Honolulu, HI	31	0	9	0	0	0	0	1	1	2	2	1	2	2	2	1	0	0	0	0
Houston-Sugarland-Baytown, TX	128	34	25	66	92	56	67	65	74	69	50	44	55	42	58	35	28	18	18	21
Indianapolis-Carmel, IN	90	15	19	(R) 60	(R) 48	(R) 36	(R) 30	(R) 40	(R) 45	(R) 25	(R) 33	(R) 48	(R) 32	(R) 20	(R) 48	(R) 25	(R) 33	7	6	8
Jacksonville, FL	33	16	12	53	25	26	26	41	34	59	38	57	8	15	20	34	15	10	3	15
Jersey City, NJ	17	14	8	19	21	15	20	16	28	9	17	22	10	5	13	13	12	U	U	U
Kansas City, MO-KS	86	25	13	19	36	15	20	23	13	21	9	26	45	33	42	65	34	36	41	18
Knoxville, TN	53	16	17	53	82	87	82	109	126	97	86	118	96	98	101	84	107	80	20	15
Las Vegas-Paradise, NV	100	10	3	(R) 7	(R) 3	(R) 12	(R) 2	(R) 7	8	(R) 4	(R) 1	(R) 8	10	4	8	(R) 9	(R) 5	0	0	1
Little Rock-North Little Rock-Conway, AR	30	2	8	8	24	9	10	13	16	29	17	18	3	0	19	11	11	2	2	2
Los Angeles-Long Beach-Santa Ana, CA	169	79	50	200	178	141	117	93	(R) 140	119	(R) 130	110	120	106	65	(R) 62	60	68	54	37
Louisville/Jefferson County, KY-IN	62	54	14	89	69	58	59	79	110	73	79	62	58	54	71	51	75	44	25	29
Madison, WI	18	2	3	1	15	7	5	8	12	3	7	10	8	1	9	1	10	1	0	2
McAllen-Edinburg-Mission, TX	8	0	1	0	0	0	0	0	0	0	0	0	2	0	0	0	0	0	0	0
Memphis, TN-AR-MS	49	14	9	37	56	(R) 38	35	55	56	52	33	34	29	11	(R) 36	30	(R) 33	10	4	13
Miami-Fort Lauderdale-Pompano Beach, FL	91	4	24	16	16	9	9	14	20	18	8	5	4	11	4	11	10	5	2	3
Middlesex-Somerset-Hunterdon, NJ	15	30	4	19	31	19	28	39	35	19	29	36	11	15	22	9	21	U	U	U
Milwaukee-Waukesha-West Allis, WI	58	9	12	17	23	15	6	16	25	8	25	21	17	6	21	6	11	3	5	8
Minneapolis-St. Paul-Bloomington, MN-WI	132	4	18	18	22	6	7	5	5	9	12	5	15	11	11	1	5	1	2	1
Monmouth-Ocean, NJ	5	21	4	41	34	31	32	46	35	19	35	46	25	22	27	19	21	U	U	U
Nashville-Davidson-Murfreesboro-Franklin, TN	51	10	17	(R) 32	(R) 49	(R) 46	(R) 50	(R) 46	(R) 73	(R) 48	(R) 24	(R) 34	20	7	(R) 29	17	34	9	1	9
Nassau-Suffolk, NY	22	16	5	28	20	14	23	27	28	12	14	22	15	6	19	11	14	U	U	U
New Haven-Milford, CT	50	10	7	19	23	15	25	15	22	18	22	32	17	6	19	8	13	9	1	8
New Orleans-Metairie-Kenner, LA	61	66	7	12	33	11	15	17	35	29	18	4	15	12	13	13	17	2	6	8
New York-Northern New Jersey-Long Island, NY-NJ-PA	268	37	53	(R) 68	(R) 48	(R) 51	(R) 52	(R) 62	(R) 57	(R) 39	(R) 56	(R) 62	(R) 37	(R) 38	(R) 46	(R) 39	39	29	11	31
Newark, NJ	44	21	16	33	33	24	23	35	36	17	34	43	14	8	18	25	21	U	U	U
Oakland, CA	86	7	19	5	13	9	2	11	20	12	15	23	13	8	6	13	5	U	U	U
Oklahoma City, OK	36	3	8	21	29	10	15	36	17	16	24	10	13	6	12	31	4	4	5	2
Omaha-Council Bluffs, NE-IA	41	3	11	1	3	0	1	3	5	3	2	0	1	1	1	0	1	0	1	1
Orange County, CA	30	19	8	30	20	13	8	7	7	11	6	6	15	10	0	7	9	U	U	U
Orlando-Kissimmee, FL	28	2	13	7	9	6	6	23	13	15	13	5	4	5	8	8	8	1	0	1
Oxnard-Thousands Oaks-Ventura, CA	38	13	14	100	103	98	76	54	54	57	52	26	48	41	36	31	22	30	24	10
Philadelphia-Camden-Wilmington, PA-NJ-DE-MD	143	32	47	117	125	(R) 100	105	101	99	60	90	97	(R) 76	38	59	53	45	29	7	30
Phoenix-Mesa-Scottsdale, AZ	165	43	23	33	41	47	33	49	52	46	25	22	26	9	23	25	11	11	6	10
Pittsburgh, PA	128	64	38	(R) 175	(R) 117	(R) 118	(R) 143	(R) 151	(R) 150	(R) 121	(R) 111	131	(R) 115	94	(R) 94	(R) 67	(R) 77	60	43	42
Portland-Vancouver-Beaverton, OR-WA	70	1	9	4	4	12	0	9	5	5	4	7	2	4	4	2	5	3	5	1
Poughkeepsie-Newburgh-Middleton, NY	8	4	2	12	14	14	10	16	18	7	17	16	5	4	6	1	11	5	1	4
Providence-New Bedford-Fall River, RI-MA	63	14	5	28	20	22	24	21	23	24	34	38	18	10	20	15	14	4	1	13
Raleigh-Cary, NC	41	3	3	11	10	13	29	46	43	15	11	39	8	3	12	7	17	5	0	2
Richmond, VA	38	11	9	39	33	37	45	54	41	20	27	46	19	12	29	17	24	17	1	7
Riverside-San Bernardino-Ontario, CA	169	116	44	183	190	169	145	131	166	176	188	177	160	148	141	128	135	124	110	109
Rochester, NY	17	0	1	8	10	1	10	11	17	2	14	16	5	0	0	1	5	2	0	0
Sacramento-Arden-Arcade-Roseville, CA	112	24	22	71	61	70	39	56	94	65	72	90	67	56	58	74	40	45	29	14
St, Louis, MO-IL	164	86	28	(R) 138	(R) 146	(R) 121	(R) 99	(R) 92	(R) 106	(R) 77	(R) 81	(R) 85	(R) 65	(R) 33	(R) 72	(R) 28	(R) 35	21	9	19
Salt Lake City, UT	49	17	9	30	8	18	4	21	18	(R) 21	30	(R) 32	(R) 19	36	26	20	27	17	16	17
San Antonio, TX	41	4	2	7	32	7	10	12	20	5	4	26	18	6	10	8	3	7	3	3
San Diego-Carlsbad-San Marcos, CA	65	15	23	97	103	62	44	53	53	58	53	35	41	27	26	39	33	35	25	14
San Francisco-Oakland-Fremont, CA	115	4	33	8	14	13	4	15	21	17	19	26	13	10	6	19	5	12	4	4
San Jose-Sunnyvale-Santa Clara, CA	44	8	5	13	21	37	7	21	14	9	9	24	14	7	4	13	3	13	6	6
San Juan-Caguas-Guaynabo, PR	51	2	6	89	6	2	2	1	4	0	2	1	1	1	1	0	1	0	0	0
Scranton-Wilkes Barre, PA	19	3	10	22	26	25	19	26	25	7	23	30	6	4	12	4	7	5	0	3
Seattle-Tacoma-Bellevue, WA	120	1	10	3	3	5	0	6	6	17	12	13	10	4	6	10	9	7	8	0
Springfield, MA	43	6	10	40	18	8	22	24	20	9	29	24	13	9	17	12	21	10	6	6
Stockton, CA	16	5	5	10	12	7	2	19	23	14	11	13	6	3	5	16	11	10	4	2
Syracuse, NY	19	3	5	8	10	3	6	10	12	2	13	19	4	0	8	3	8	3	1	3
Tacoma, WA	25	14	4	3	3	4	0	6	2	15	11	9	8	4	4	9	7	U	U	U
Tampa-St. Petersburg-Clearwater, FL	80	12	21	(R) 160	(R) 100	115	(R) 118	(R) 129	(R) 125	(R) 100	(R) 93	(R) 80	(R) 68	(R) 36	30	(R) 19	(R) 26	10	6	1
Toledo, OH	20	4	3	(R) 11	(R) 14	(R) 14	(R) 7	(R) 8	(R) 16	(R) 9	(R) 21	(R) 21	(R) 14	(R) 6	(R) 19	(R) 2	(R) 4	1	2	4
Tucson, AZ	52	0	20	10	14	8	8	7	8	5	0	7	7	0	8	9	1	2	2	0
Tulsa, OK	40	3	8	27	40	27	15	27	30	23	31	22	16	9	22	24	4	13	2	3
Ventura, CA	38	23	14	97	100	95	75	54	54	57	52	26	47	41	36	31	22	U	U	U
Virginia Beach-Norfolk-Newport News, VA-NC	42	7	7	22	26	15	43	36	35	25	14	33	10	6	12	13	11	16	0	4
Washington-Arlington-Alexandria, DC-MD-VA-WV	127	35	36	50	57	41	56	72	66	38	46	58	29	25	40	32	37	16	4	22
West Palm Beach-Boca Raton, FL	24	3	4	0	0	0	0	0	0	1	0	0	0	0	0	0	2	U	U	U
Wichita, KS	22	4	9	1	7	3	8	12	9	9	20	10	7	1	4	2	0	1	2	2
Wilmington-Newark, DE-MD	41	27	9	46	47	22	31	42	40	24	36	34	24	10	22	20	25	U	U	U
Worcester, MA	22	3	2	20	15	2	8	14	14	4	9	15	9	3	8	5	20	8	4	3
Youngstown-Warren-Boardman, OH	26	6	11	27	19	23	19	46	24	12	45	35	16	7	26	8	18	8	2	4

KEY: AQI = Air Quality Index; R = revised.

NOTES

The Air Quality Index (AQI) integrates information on 6 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. Air quality monitoring sites are selected as "trend sites" if they have complete data for at least 8 of the 10 last years.

The major reason for revisions to the historical data for the AQI is that changes in the National Ambient Air Quality Standards (NAAQS) are retroactively applied to the data for previous years to provide consistent comparisons over time. In addition, data from monitoring stations that have fallen below/surpassed the criterion to qualify as a 'trend site' is excluded/included in the latest calculation of the index.

Data for 1999 to 2009 include particulate matter 2.5 micron in diameter (PM 2.5).

Particulate matter is the term for solid or liquid particles found in the air.

SOURCE

U.S. Environmental Protection Agency, Office of Air and Radiation, Air Trends, Air Quality Index Information, available at http://www.epa.gov/air/airtrends/aqi_info.html as of Dec. 21, 2011.