BTS | Table 4-47: Air Pollution Trends in Selected Metropolitan Statistical Areas

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Table 4-47: Air Pollution Trends in Selected Metropolitan Statistical Areas

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

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	All sites		Trend sites
	Total number of sites	AQI days > 100 (1999)	Number of trend sites	1990	1991	1992	1993	1994	1995	1996	1997	1998	1999
Akron, OH	6	^R20	5	9	30	8	10	8	12	11	6	14	20
Albany-Schenectady-Troy, NY	^R10	^R6	^R10	4	9	5	5	6	3	4	3	2	6
Albuquerque, NM	^R21	^R2	21	8	5	0	0	1	0	0	0	0	1
Allentown-Bethlehem-Easton, PA	9	^R23	^R5	10	14	3	6	^R3	^R9	6	13	18	20
Atlanta, GA	18	^R69	^R10	42	23	^R20	^R36	^R15	^R35	^R25	^R31	^R50	61
Austin-San Marcos, TX	^R3	^R19	^R1	4	3	1	2	4	^R10	0	0	5	8
Bakersfield, CA	^R14	^R94	^R8	^R99	^R113	100	97	98	^R105	109	55	^R76	88
Baltimore, MD	^R20	^R40	^R17	29	50	23	48	41	36	28	30	51	40
Baton Rouge, LA	10	^R26	^R7	28	11	5	^R6	7	15	7	8	14	17
Bergen-Passaic, NJ	^R7	0	^R7	8	11	2	3	5	11	3	5	0	0
Birmingham, AL	^R14	^R27	^R14	28	5	12	10	6	32	15	8	23	27
Boston, MA-NH	^R24	9	^R24	7	13	9	6	10	8	2	8	7	5
Buffalo-Niagara Falls, NY	^R20	^R8	^R20	^R7	9	3	1	4	6	3	1	13	8
Charleston-North Charleston, SC	9	^R5	9	1	2	0	2	2	1	3	3	3	5
Charlotte-Gastonia-Rock Hill, NC-SC	^R24	^R42	^R12	31	12	11	23	9	13	18	26	48	34
Chicago, IL	^R51	^R12	^R45	4	22	4	3	8	21	6	9	7	12
Cincinnati, OH-KY-IN	23	^R27	^R19	^R12	^R19	^R1	^R6	^R16	^R19	^R10	11	14	12
Cleveland-Lorain-Elyria, OH	40	^R23	^R27	10	23	11	13	23	24	^R18	^R11	20	18
Columbus, OH	12	^R25	^R9	4	17	5	7	10	15	16	8	19	20
Dallas, TX	^R9	^R35	^R9	24	2	^R12	^R14	^R27	36	12	^R20	^R28	23
Dayton-Springfield, OH	13	^R20	10	13	12	2	11	14	11	18	9	19	19
Denver, CO	^R28	^R5	^R22	9	6	^R11	3	1	2	0	0	5	1
Detroit, MI	^R29	^R15	^R29	11	28	8	5	^R11	14	13	12	17	15
El Paso, TX	^R24	^R7	^R19	19	7	10	7	11	^R8	7	^R4	^R6	6
Fort Lauderdale, FL	18	1	^R15	1	0	2	4	1	1	1	0	1	1
Fort Worth-Arlington, TX	^R5	^R19	^R5	16	20	7	9	31	28	14	14	17	19
Fresno, CA	15	^R83	^R12	62	83	69	59	55	61	70	75	67	81
Gary, IN	^R18	^R12	^R15	2	8	5	0	6	17	11	12	9	10
Grand Rapids-Muskegon-Holland, MI	^R9	^R21	8	10	26	6	3	12	17	7	8	13	20
Greensboro-Winston-Salem-High Pt, NC	^R15	^R29	^R9	12	5	2	20	7	6	6	13	25	20
Greenville-Spartanburg-Anderson, SC	7	^R19	5	2	3	5	9	5	8	7	10	^R28	19
Harrisburg-Lebanon-Carlisle, PA	^R6	^R17	^R6	10	21	1	15	12	13	3	9	22	17
Hartford, CT	15	^R18	15	13	23	15	14	18	14	5	16	10	18
Honolulu, HI	14	0	^R10	0	0	0	0	0	0	0	0	0	0
Houston, TX	^R23	^R54	^R23	^R51	^R36	32	28	^R38	66	^R26	47	38	50
Indianapolis, IN	^R32	^R26	^R27	9	12	7	9	22	19	13	12	19	21
Jacksonville, FL	^R14	^R3	^R14	3	0	2	3	2	1	1	4	10	3
Jersey City, NJ	7	^R17	7	15	^R26	^R11	19	^R17	^R18	5	9	7	17
Kansas City, MO-KS	^R21	^R5	21	2	11	1	4	10	22	10	18	15	5
Knoxville, TN	18	^R62	^R15	23	10	7	^R25	^R16	^R24	^R20	36	^R54	59
Las Vegas, NV-AZ	^R26	^R7	^R5	^R4	^R0	^R1	^R2	^R2	^R0	^R2	0	0	0
Little Rock-North Little Rock, AR	7	^R6	7	1	3	0	2	2	7	1	1	2	6
Los Angeles-Long Beach, CA	38	^R27	38	173	^R168	175	134	139	113	94	60	56	27
Louisville, KY-IN	26	^R44	^R20	10	15	2	^R23	27	^R22	^R11	^R14	^R27	40
Memphis, TN-AR-MS	14	^R36	^R12	24	9	14	15	10	21	19	17	27	36
Miami, FL	12	^R5	^R12	1	1	3	6	1	2	1	3	8	5
Middlesex-Somerset-Hunterdon, NJ	^R5	^R26	^R3	24	24	8	13	9	16	8	18	21	23
Milwaukee-Waukesha, WI	22	^R18	18	8	24	3	4	9	14	5	4	10	13
Minneapolis-St. Paul, MN-WI	^R36	^R0	^R20	4	2	^R1	0	^R2	^R5	^R0	0	^R1	0
Monmouth-Ocean, NJ	4	^R27	^R4	21	20	^R11	^R24	^R13	^R20	^R17	^R21	^R31	27
Nashville, TN	21	^R45	^R16	^R29	^R12	6	18	21	^R26	^R22	20	30	33
Nassau-Suffolk, NY	^R7	^R18	^R7	20	25	^R7	^R17	^R15	^R10	^R8	^R12	^R11	18
New Haven-Meriden, CT	^R9	^R16	^R9	17	29	10	17	14	14	8	19	10	16
New Orleans, LA	^R10	^R18	^R10	6	2	5	6	8	20	8	7	7	18
New York, NY	^R30	^R27	29	36	49	10	19	21	19	15	23	17	24
Newark, NJ	12	^R21	12	23	35	10	13	13	20	12	13	23	21
Norfolk-VA Beach-Newport News, VA-NC	12	^R16	^R10	8	7	8	19	6	6	4	17	15	16
Oakland, CA	29	^R6	^R18	4	4	3	4	3	12	11	0	11	5
Oklahoma City, OK	^R10	^R6	10	4	4	2	2	5	13	2	4	7	6
Omaha, NE-IA	12	5	9	1	0	0	1	1	1	1	0	5	5
Orange County, CA	^R12	^R1	11	45	35	35	25	15	9	9	3	6	1
Orlando, FL	13	^R4	^R11	4	1	4	4	3	1	1	4	11	4
Philadelphia, PA-NJ	44	^R32	36	39	49	24	51	26	30	22	32	37	32
Phoenix-Mesa, AZ	^R51	37	^R25	12	11	13	16	10	22	17	12	17	12
Pittsburgh, PA	^R42	^R26	^R42	19	21	9	13	19	25	11	^R21	39	23
Ponce, PR	1	0	1	0	0	0	0	0	0	0	0	0	0
Portland-Vancouver, OR-WA	^R15	^R2	^R15	11	^R9	6	0	2	2	6	0	3	2
Providence-Fall River-Warwick, RI-MA	^R12	^R13	^R9	13	20	5	7	7	11	4	10	4	7
Raleigh-Durham-Chapel Hill, NC	^R17	^R29	^R5	15	5	0	11	2	1	1	13	21	26
Richmond-Petersburg, VA	11	^R25	^R11	6	18	8	30	13	19	5	21	28	25
Riverside-San Bernardino, CA	^R47	^R97	^R36	^R159	154	174	168	149	124	119	^R105	^R95	93
Rochester, NY	8	^R9	8	5	16	2	0	1	6	0	6	4	9
Sacramento, CA	33	^R48	^R20	^R61	^R46	^R51	^R20	^R36	^R41	^R42	^R15	^R27	38
St. Louis, MO-IL	^R55	^R29	^R55	23	32	15	9	32	34	20	15	23	29
Salt Lake City-Ogden, UT	^R24	^R5	^R13	5	20	9	5	^R12	4	8	1	12	2
San Antonio, TX	^R4	^R9	^R4	4	3	1	3	4	18	3	3	6	9
San Diego, CA	^R27	^R17	23	96	67	66	58	46	48	31	14	33	16
San Francisco, CA	11	0	9	0	0	0	0	0	2	0	0	0	0
San Jose, CA	^R9	^R4	8	7	11	3	4	2	10	7	0	5	2
San Juan-Bayamon, PR	^R21	^R3	^R11	0	0	0	0	0	0	1	2	1	1
Scranton-Wilkes Barre-Hazleton, PA	11	^R12	11	9	17	3	10	7	12	4	11	7	12
Seattle-Bellevue-Everett, WA	^R24	^R1	^R17	9	4	3	0	3	0	6	1	3	1
Springfield, MA	13	^R10	13	13	15	12	13	12	9	5	10	7	10
Syracuse, NY	^R7	^R4	^R7	1	^R12	2	4	^R1	^R5	0	^R2	^R3	4
Tacoma, WA	9	^R0	^R8	5	1	2	0	2	0	1	0	4	0
Tampa-St. Petersburg-Clearwater, FL	^R40	^R9	^R26	6	1	^R2	1	3	2	3	4	11	9
Toledo, OH	6	^R9	^R5	3	6	2	7	9	9	11	4	5	4
Tucson, AZ	^R21	^R2	20	1	0	1	1	^R0	3	0	1	0	2
Tulsa, OK	11	^R14	11	16	12	1	4	12	21	14	7	9	14
Ventura, CA	15	^R23	12	70	87	54	^R43	63	^R66	62	^R45	29	22
Washington, DC-MD-VA-WV	^R42	^R39	^R40	25	48	14	^R52	20	29	18	29	^R47	39
West Palm Beach-Boca Raton, FL	^R7	^R1	6	0	0	0	3	0	0	0	0	2	1
Wilmington-Newark, DE-MD	10	^R21	^R9	9	12	^R12	^R29	^R24	^R27	^R13	^R21	^R24	21
Youngstown-Warren, OH	15	^R13	^R14	3	14	^R10	^R10	^R5	^R12	^R8	^R10	^R22	12

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 1999, 4,184 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 1990 and 1999.

SOURCE: U.S. Environmental Protection Agency, Office of Air Quality Planning and Standards, National Air Quality and Emissions Trends Report, 1999 (Research Triangle Park, NC: 2001), table A-17.