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

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

Excel | CSV

	All sites		Trend sites
	Total number of sites	AQI days > 100 (1998)	Number of trend sites	1989	1990	1991	1992	1993	1994	1995	1996	1997	1998
Akron, OH	6	14	5	15	9	30	8	10	8	12	11	6	14
Albany-Schenectady-Troy, NY	13	2	7	4	4	9	5	5	6	3	4	3	2
Albuquerque, NM	25	0	21	8	8	5	0	0	1	0	0	0	0
Allentown-Bethlehem-Easton, PA	9	18	9	11	10	14	3	6	10	17	6	13	18
Atlanta, GA	18	60	7	14	42	23	18	30	12	33	21	26	43
Austin-San Marcos, TX	5	6	5	4	4	3	1	2	4	12	0	0	5
Bakersfield, CA	16	78	7	113	97	109	100	97	98	104	109	55	75
Baltimore, MD	22	51	15	28	29	50	23	48	41	36	28	30	51
Baton Rouge, LA	10	21	6	12	28	11	5	5	7	15	7	8	14
Bergen-Passaic, NJ	8	0	8	12	8	11	2	3	5	11	3	5	0
Birmingham, AL	16	23	16	5	28	5	12	10	6	32	15	8	23
Boston, MA-NH	25	9	25	12	7	13	9	6	10	8	2	8	7
Buffalo-Niagara Falls, NY	21	13	21	4	8	9	3	1	4	6	3	1	13
Charleston-North Charleston, SC	9	3	9	5	1	2	0	2	2	1	3	3	3
Charlotte-Gastonia-Rock Hill, NC-SC	26	51	10	13	31	12	11	23	9	13	18	26	48
Chicago, IL	61	10	46	16	4	22	4	3	8	21	6	9	7
Cincinnati, OH-KY-IN	23	20	20	19	19	22	3	13	19	23	11	11	14
Cleveland-Lorain-Elyria, OH	40	22	24	18	10	23	11	13	23	24	17	12	20
Columbus, OH	12	23	10	7	4	17	5	7	10	15	16	8	19
Dallas, TX	11	36	8	18	24	2	11	12	15	36	12	15	18
Dayton-Springfield, OH	13	21	10	10	13	12	2	11	14	11	18	9	19
Denver, CO	29	9	20	14	9	6	8	3	1	2	0	0	5
Detroit, MI	32	17	30	18	11	28	8	5	13	14	13	12	17
El Paso, TX	22	8	17	25	19	7	10	7	11	5	7	3	5
Fort Lauderdale, FL	18	1	8	6	1	0	2	4	1	1	1	0	1
Fort Worth-Arlington, TX	8	17	8	17	16	20	7	9	31	28	14	14	17
Fresno, CA	15	69	11	91	62	83	69	59	55	61	70	75	67
Gary, IN	22	10	18	15	2	8	5	0	6	17	11	12	9
Grand Rapids-Muskegon-Holland, MI	10	19	8	16	10	26	6	3	12	17	7	8	13
Greensboro-Winston-Salem-High Pt, NC	16	30	7	6	12	5	2	20	7	6	6	13	25
Greenville-Spartanburg-Anderson, SC	7	29	5	3	2	3	5	9	5	8	7	10	29
Harrisburg-Lebanon-Carlisle, PA	7	22	7	10	10	21	1	15	12	13	3	9	22
Hartford, CT	15	10	15	19	13	23	15	14	18	14	5	16	10
Honolulu, HI	14	0	6	0	0	0	0	0	0	0	0	0	0
Houston, TX	26	40	26	43	54	37	32	28	45	66	28	47	38
Indianapolis, IN	37	22	29	15	9	12	7	9	22	19	13	12	19
Jacksonville, FL	15	10	15	4	3	0	2	3	2	1	1	4	10
Jersey City, NJ	7	7	7	15	15	25	9	19	12	16	5	9	7
Kansas City, MO-KS	22	15	21	4	2	11	1	4	10	22	10	18	15
Knoxville, TN	18	55	14	2	23	10	7	20	13	20	19	36	52
Las Vegas, NV-AZ	28	11	6	36	21	8	4	6	8	1	5	0	0
Little Rock-North Little Rock, AR	7	3	7	1	1	3	0	2	2	7	1	1	2
Los Angeles-Long Beach, CA	38	56	38	215	173	169	175	134	139	113	94	60	56
Louisville, KY-IN	26	29	18	15	10	15	2	20	27	21	10	13	24
Memphis, TN-AR-MS	14	27	13	8	24	9	14	15	10	21	19	17	27
Miami, FL	12	8	10	5	1	1	3	6	1	2	1	3	8
Middlesex-Somerset-Hunterdon, NJ	4	22	4	19	24	24	8	13	9	16	8	18	21
Milwaukee-Waukesha, WI	22	12	18	17	8	24	3	4	9	14	5	4	10
Minneapolis-St. Paul, MN-WI	37	1	24	8	4	2	3	0	4	7	1	0	0
Monmouth-Ocean, NJ	4	31	3	15	21	20	6	11	3	6	12	12	19
Nashville, TN	21	32	17	12	31	13	6	18	21	28	23	20	30
Nassau-Suffolk, NY	8	11	4	14	20	25	5	15	10	9	6	8	10
New Haven-Meriden, CT	10	10	10	11	17	29	10	17	14	14	8	19	10
New Orleans, LA	11	7	11	4	6	2	5	6	8	20	8	7	7
New York, NY	39	21	29	29	36	49	10	19	21	19	15	23	17
Newark, NJ	12	23	12	21	23	35	10	13	13	20	12	13	23
Norfolk-VA Beach-Newport News, VA-NC	12	15	12	4	8	7	8	19	6	6	4	17	15
Oakland, CA	29	12	20	6	4	4	3	4	3	12	11	0	11
Oklahoma City, OK	14	7	10	4	4	4	2	2	5	13	2	4	7
Omaha, NE-IA	12	5	9	1	1	0	0	1	1	1	1	0	5
Orange County, CA	11	6	11	56	45	35	35	25	15	9	9	3	6
Orlando, FL	13	14	9	9	4	1	4	4	3	1	1	4	11
Philadelphia, PA-NJ	44	38	36	44	39	49	24	51	26	30	22	32	37
Phoenix-Mesa, AZ	49	37	23	30	12	11	13	16	10	22	17	12	17
Pittsburgh, PA	53	39	41	21	19	21	9	13	19	25	11	20	39
Ponce, PR	1	0	1	0	0	0	0	0	0	0	0	0	0
Portland-Vancouver, OR-WA	17	3	12	2	11	8	6	0	2	2	6	0	3
Providence-Fall River-Warwick, RI-MA	13	5	11	9	13	20	5	7	7	11	4	10	4
Raleigh-Durham-Chapel Hill, NC	18	40	4	14	15	5	0	11	2	1	1	13	21
Richmond-Petersburg, VA	11	28	10	11	6	18	8	30	13	19	5	21	28
Riverside-San Bernardino, CA	51	96	35	187	158	154	174	168	149	124	119	106	94
Rochester, NY	8	4	8	5	5	16	2	0	1	6	0	6	4
Sacramento, CA	33	33	13	63	36	54	44	14	30	32	30	5	17
St. Louis, MO-IL	63	24	54	25	23	32	15	9	32	34	20	15	23
Salt Lake City-Ogden, UT	23	19	12	21	5	20	9	5	13	4	8	1	12
San Antonio, TX	7	6	7	3	4	3	1	3	4	18	3	3	6
San Diego, CA	28	35	23	127	96	67	66	58	46	48	31	14	33
San Francisco, CA	11	0	9	0	0	0	0	0	0	2	0	0	0
San Jose, CA	11	8	8	18	7	11	3	4	2	10	7	0	5
San Juan-Bayamon, PR	27	1	10	0	0	0	0	0	0	0	1	2	1
Scranton-Wilkes Barre-Hazleton, PA	11	7	11	6	9	17	3	10	7	12	4	11	7
Seattle-Bellevue-Everett, WA	26	3	16	6	9	4	3	0	3	0	6	1	3
Springfield, MA	13	7	13	10	13	15	12	13	12	9	5	10	7
Syracuse, NY	8	3	6	2	1	11	2	4	0	1	0	0	2
Tacoma, WA	9	4	7	3	5	1	2	0	2	0	1	0	4
Tampa-St. Petersburg-Clearwater, FL	32	11	22	4	6	1	1	1	3	2	3	4	11
Toledo, OH	6	6	6	8	3	6	2	7	9	9	11	4	5
Tucson, AZ	25	0	20	2	1	0	1	1	1	3	0	1	0
Tulsa, OK	11	9	11	5	16	12	1	4	12	21	14	7	9
Ventura, CA	15	30	12	87	70	87	54	37	63	65	62	44	29
Washington, DC-MD-VA-WV	46	47	32	24	25	48	14	48	20	29	18	29	45
West Palm Beach-Boca Raton, FL	9	2	6	1	0	0	0	3	0	0	0	0	2
Wilmington-Newark, DE-MD	10	28	5	12	9	12	7	10	5	12	3	6	8
Youngstown-Warren, OH	15	22	9	8	3	14	5	2	0	11	5	3	15

KEY: 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 1997, 4,738 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 1989 and 1998.

SOURCE: U.S. Environmental Protection Agency, Office of Air Quality Planning and Standards, National Air Quality and Emissions Trends Report, 1998 (Research Triangle Park, NC: 2000), table A-15.

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