BTS | 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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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^R	AQI days > 100 (2001)	Number of trend sites^R	1992	1993	1994	1995	1996	1997	1998	1999	2000	2001
Akron, OH	2	12	2	8	10	8	12	11	6	14	20	4	12
Albany-Schenectady-Troy, NY	3	11	3	5	5	6	3	4	3	2	6	1	11
Albuquerque, NM	1	1	1	0	0	1	0	0	0	0	1	0	1
Allentown-Bethlehem-Easton, PA	3	15	2	3	6	3	9	6	13	18	20	5	9
Atlanta, GA	12	18	3	20	36	15	35	25	31	50	61	26	8
Austin-San Marcos, TX	1	1	0	1	2	4	10	0	0	5	8	6	0
Bakersfield, CA	8	33	7	100	97	^R104	^R107	^R110	^R58	76	^R94	82	33
Baltimore, MD	8	26	7	23	48	^R40	36	28	30	51	40	16	26
Baton Rouge, LA	6	5	6	^R6	^R13	^R10	^R21	^R11	^R16	^R16	^R23	29	5
Bergen-Passaic, NJ	2	5	0	^R0	^R0	^R0	^R0	^R0	^R0	^R1	0	0	0
Birmingham, AL	6	12	6	12	10	6	32	15	8	^R22	27	22	12
Boston, MA-NH	5	18	3	^R6	^R2	^R6	^R7	^R4	^R7	^R8	^R8	1	14
Buffalo-Niagara Falls, NY	2	13	2	3	1	4	6	3	1	13	8	5	13
Charleston-North Charleston, SC	0	0	0	0	2	2	1	3	3	3	5	4	0
Charlotte-Gastonia-Rock Hill, NC-SC	7	26	6	11	^R29	^R15	^R19	^R23	^R30	^R49	^R40	22	23
Chicago, IL	19	16	19	^R6	3	^R9	^R24	^R7	9	^R10	^R14	0	15
Cincinnati, OH-KY-IN	8	12	5	1	^R5	16	19	10	11	^R13	12	4	6
Cleveland-Lorain-Elyria, OH	9	24	8	11	^R16	^R25	^R27	^R19	^R13	^R22	^R21	5	17
Columbus, OH	7	9	4	5	^R8	^R12	^R18	^R19	^R13	^R21	^R22	6	7
Dallas, TX	8	24	2	^R8	^R13	^R26	^R28	^R10	20	^R26	23	20	14
Dayton-Springfield, OH	5	5	4	2	11	14	11	18	^R10	19	19	6	4
Denver, CO	6	2	6	11	^R6	^R3	^R5	^R1	0	^R9	^R4	2	2
Detroit, MI	7	16	7	7	5	11	14	13	^R11	17	15	3	16
El Paso, TX	4	8	4	10	7	^R9	^R7	^R5	^R3	6	^R1	3	5
Fort Lauderdale, FL	2	2	2	2	4	1	1	1	0	1	1	1	2
Fort Worth-Arlington, TX	7	25	2	7	9	31	28	14	14	17	19	16	17
Fresno, CA	7	85	6	69	59	55	61	70	75	67	81	78	85
Gary, IN	4	10	2	5	0	6	17	11	^R11	9	10	5	9
Grand Rapids-Muskegon-Holland, MI	5	11	4	^R5	3	^R14	^R18	^R9	^R10	^R19	^R21	3	11
Greensboro-Winston-Salem-High Pt., NC	7	20	4	2	^R22	7	^R13	^R7	^R14	25	^R24	12	12
Greenville-Spartanburg-Anderson, SC	4	13	4	5	^R8	5	^R7	7	^R9	28	19	11	13
Harrisburg-Lebanon-Carlisle, PA	3	17	3	1	15	12	13	3	9	22	17	5	17
Hartford, CT	3	16	3	15	14	18	14	5	16	10	18	7	16
Honolulu, HI	0	0	0	0	0	0	0	0	0	0	0	0	0
Houston, TX	16	37	9	32	^R27	^R41	66	^R28	47	^R29	^R52	41	28
Indianapolis, IN	11	10	7	^R6	9	22	^R21	^R16	12	19	^R24	4	8
Jacksonville, FL	2	1	2	2	3	2	1	1	4	^R2	3	0	1
Jersey City, NJ	1	3	1	11	19	17	18	5	9	7	17	3	3
Kansas City, MO-KS	4	4	4	1	^R3	10	^R21	^R7	^R16	^R14	5	10	4
Knoxville, TN	7	17	7	7	25	16	^R26	^R21	^R37	54	^R62	36	17
Las Vegas, NV-AZ	6	5	3	^R3	^R3	^R3	0	^R4	0	^R3	0	0	1
Little Rock-North Little Rock, AR	2	4	2	0	2	2	7	1	1	^R3	^R5	16	4
Los Angeles-Long Beach, CA	14	36	14	175	134	139	113	94	60	56	27	48	30
Louisville, KY-IN	6	10	6	2	23	^R28	^R24	11	^R18	^R29	^R44	10	10
Memphis, TN-AR-MS	4	13	4	14	15	10	21	19	17	^R26	^R35	24	13
Miami, FL	4	1	4	3	6	1	2	1	3	^R6	5	0	1
Middlesex-Somerset-Hunterdon, NJ	2	11	2	8	13	9	^R20	^R15	^R19	^R22	^R26	11	11
Milwaukee-Waukesha, WI	9	12	9	3	4	^R12	14	5	^R5	^R12	^R18	4	12
Minneapolis-St. Paul, MN-WI	3	3	2	1	0	2	5	0	0	1	0	0	2
Monmouth-Ocean, NJ	2	13	2	11	24	13	20	17	21	31	27	11	13
Nashville, TN	6	7	6	6	^R19	21	26	^R23	20	30	33	16	7
Nassau-Suffolk, NY	3	9	2	7	17	15	10	8	12	11	18	5	3
New Haven-Meriden, CT	2	13	2	10	^R13	^R13	14	8	19	10	16	6	11
New Orleans, LA	6	5	6	5	6	8	20	8	7	^R4	18	17	5
New York, NY	8	20	4	^R4	^R11	^R16	^R20	^R14	23	^R16	^R25	11	16
Newark, NJ	2	10	2	10	13	13	20	12	13	23	21	7	10
Norfolk-VA Beach-Newport News, VA-NC	3	6	3	8	19	6	6	4	17	15	16	5	6
Oakland, CA	7	4	7	^R4	4	3	12	11	0	^R12	^R6	3	3
Oklahoma City, OK	4	2	4	2	2	5	13	2	4	^R6	6	6	2
Omaha, NE-IA	1	1	1	0	1	1	1	^R0	0	^R1	5	1	1
Orange County, CA	4	4	4	35	25	15	9	9	3	6	1	4	2
Orlando, FL	4	3	4	4	4	3	1	1	^R5	^R9	4	3	3
Philadelphia, PA-NJ	12	25	12	^R27	^R62	^R37	^R38	^R38	^R38	37	32	18	22
Phoenix-Mesa, AZ	12	18	7	^R11	^R15	^R9	22	^R15	12	^R14	^R10	10	6
Pittsburgh, PA	13	20	9	9	^R15	^R21	^R26	11	^R20	39	^R24	4	18
Ponce, PR	0	0	0	0	0	0	0	0	0	0	0	0	0
Portland-Vancouver, OR-WA	3	2	3	6	0	2	2	6	0	3	2	0	2
Providence-Fall River-Warwick, RI-MA	2	13	1	^R0	^R0	^R5	^R7	^R2	^R3	^R2	^R2	2	10
Raleigh-Durham-Chapel Hill, NC	6	9	6	0	^R17	^R15	^R12	^R13	^R21	^R37	^R29	12	8
Richmond-Petersburg, VA	4	14	4	8	30	13	19	5	21	28	25	5	12
Riverside-San Bernardino, CA	20	97	20	174	168	^R150	124	^R118	105	^R94	^R96	100	94
Rochester, NY	2	5	2	2	0	1	6	0	6	4	9	1	5
Sacramento, CA	11	25	10	^R50	20	^R37	41	^R44	^R17	^R29	^R39	29	17
St. Louis, MO-IL	15	15	15	15	9	^R33	^R36	20	15	23	29	14	15
Salt Lake City-Ogden, UT	6	6	6	^R8	^R4	^R10	^R5	^R14	^R2	^R19	^R4	2	4
San Antonio, TX	1	1	0	^R0	3	^R3	^R17	^R2	3	^R4	9	0	0
San Diego, CA	9	17	9	66	^R59	46	48	31	14	33	16	14	17
San Francisco, CA	0	0	0	0	0	0	2	0	0	0	0	0	0
San Jose, CA	6	3	6	3	4	2	^R14	^R8	0	^R8	^R4	1	3
San Juan-Bayamon, PR	0	0	0	0	0	0	0	^R0	^R0	^R0	^R0	0	0
Scranton-Wilkes Barre-Hazleton, PA	4	10	4	3	10	7	12	4	11	7	12	1	10
Seattle-Bellevue-Everett, WA	2	1	0	^R5	0	3	^R2	6	1	3	1	1	0
Springfield, MA	4	13	4	12	13	12	9	5	10	7	10	2	13
Syracuse, NY	2	4	2	2	4	1	5	0	2	3	4	1	4
Tacoma, WA	0	0	0	2	0	2	0	1	0	4	0	0	0
Tampa-St. Petersburg-Clearwater, FL	9	6	7	2	1	3	2	3	4	^R6	9	6	4
Toledo, OH	4	11	2	2	7	^R8	9	11	4	5	4	2	9
Tucson, AZ	0	0	0	1	1	0	3	0	1	0	^R1	0	0
Tulsa, OK	5	7	3	1	4	12	21	14	7	9	14	7	4
Ventura, CA	6	23	6	54	43	63	66	62	45	29	22	27	18
Washington, DC-MD-VA-WV	20	23	16	14	52	^R22	^R32	18	^R30	47	39	11	22
West Palm Beach-Boca Raton, FL	2	1	2	0	3	0	0	0	0	2	1	0	1
Wilmington-Newark, DE-MD	5	20	4	12	29	24	27	13	^R22	^R28	21	18	19
Youngstown-Warren, OH	3	12	3	10	10	5	12	8	10	22	12	2	12

KEY: AQI = Air Quality Index; 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 1992 and 2001.

SOURCE

U.S. Environmental Protection Agency, Office of Air Quality Planning and Standards, National Air Quality and Emissions Trends Report, 2000 (Research Triangle Park, NC: 2002), table A-16.