Quarterly Median		
	Days with	Range	Q1	Q2	Q3	Q4	Annual	Annual	
MSA Name	MSA Code	N	AQI >100	Min	Max	Median	(n)	Median	(n)	Median	(n)	Median	(n)	Median	Mean	±SD	
Albuquerque,NM	 200	364	  7	  8	414	 42.0	(89)	 47.0	(91)	 33.5	(92)	 38.0	(92)	 41.0	43.26	±30.43	
Asheville,NC	 480	 59	  0	  2	 39	 11.0	(15)	 19.0	(15)	 21.0	(16)	  6.0	(13)	 14.0	14.85	±8.14	
Atlanta,GA	 520	365	  0	  4	 57	 18.0	(90)	 23.0	(91)	 25.0	(92)	 18.0	(92)	 21.0	21.97	±9.43	
Augusta-Aiken,GA	 600	 60	  0	  2	 55	 12.0	(16)	 19.0	(15)	 20.0	(16)	 14.0	(13)	 16.0	17.83	±9.95	
Austin-San Marcos,TX	 640	 60	  0	  2	 49	 17.0	(15)	 20.0	(15)	 20.0	(16)	 17.0	(14)	 19.0	19.78	±8.20	
Baltimore,MD	 720	 61	  0	 10	 70	 24.0	(15)	 30.0	(15)	 28.5	(16)	 21.0	(15)	 25.0	28.54	±14.00	
Baton Rouge,LA	 760	 60	  0	  7	 59	 19.0	(15)	 24.0	(15)	 30.5	(16)	 24.0	(14)	 23.0	25.38	±10.46	
Bergen-Passaic,NJ	 875	 48	  0	 13	 53	 26.0	(15)	 30.0	(13)	 24.0	(5)	 19.0	(15)	 24.5	26.77	±11.37	
Biloxi-Gulfport-Pascagoula,MS	 920	 52	  0	  6	 24	 12.0	(15)	 14.0	(11)	 13.0	(15)	 15.0	(11)	 13.0	14.10	±4.82	
Birmingham,AL	1000	365	  2	 11	110	 43.5	(90)	 47.0	(91)	 52.5	(92)	 41.0	(92)	 46.0	46.00	±18.03	
Bismarck,ND	1010	 61	  0	  5	 59	 13.0	(15)	 16.0	(15)	 19.5	(16)	 11.0	(15)	 15.0	16.89	±8.96	
Boise City,ID	1080	363	  0	  3	 98	 21.5	(88)	 26.0	(91)	 41.5	(92)	 32.0	(92)	 30.0	32.05	±16.17	
Boston,MA-NH	1120	 63	  0	 11	 58	 25.0	(15)	 20.0	(16)	 27.0	(17)	 19.0	(15)	 22.0	25.30	±11.62	
Burlington,VT	1305	 58	  0	  4	 58	 11.0	(14)	  9.5	(14)	 13.0	(16)	  9.0	(14)	 11.0	12.36	±8.88	
Casper,WY	1350	 54	  0	  4	 41	 11.5	(12)	 19.0	(14)	 19.0	(15)	  9.0	(13)	 13.0	16.07	±8.79	
Charleston-North Charleston,SC	1440	282	  0	  3	 47	 15.0	(60)	 17.0	(91)	 17.0	(42)	 16.0	(89)	 16.0	17.01	±6.22	
Charleston,WV	1480	343	  0	  5	 58	 17.0	(90)	 22.0	(78)	 26.0	(83)	 14.0	(92)	 19.0	20.52	±9.71	
Charlotte-Gastonia-Rock Hill,NC-SC	1520	 61	  0	  7	 51	 25.0	(15)	 29.0	(15)	 31.5	(16)	 19.0	(15)	 26.0	26.84	±10.63	
Cheyenne,WY	1580	 57	  0	  2	 44	  9.0	(15)	 22.0	(13)	 17.0	(15)	  8.0	(14)	 13.0	15.07	±9.13	
Chicago,IL	1600	364	  0	  4	 77	 30.0	(90)	 29.0	(90)	 38.0	(92)	 24.0	(92)	 31.0	33.26	±16.34	
Cincinnati,OH-KY-IN	1640	362	  0	  5	 68	 14.0	(90)	 19.0	(89)	 29.0	(91)	 15.5	(92)	 18.0	20.61	±10.95	
Cleveland-Lorain-Elyria,OH	1680	365	  0	  9	 84	 28.5	(90)	 33.0	(91)	 44.0	(92)	 29.5	(92)	 31.0	34.89	±14.74	
Columbia,SC	1760	364	  0	  3	 87	 26.0	(90)	 33.0	(91)	 39.0	(91)	 23.5	(92)	 30.0	33.28	±16.52	
Columbus,OH	1840	333	  0	  6	 69	 16.0	(58)	 21.0	(91)	 32.5	(92)	 16.5	(92)	 20.0	24.51	±13.40	
Dallas,TX	1920	 61	  0	 10	 58	 29.0	(15)	 29.0	(15)	 33.5	(16)	 25.0	(15)	 29.0	30.62	±10.89	
Denver,CO	2080	365	  0	 12	 93	 31.5	(90)	 39.0	(91)	 33.0	(92)	 38.5	(92)	 35.0	37.61	±14.76	
Des Moines,IA	2120	324	  0	  1	 59	 20.0	(83)	 13.0	(90)	 17.0	(59)	 13.0	(92)	 16.0	17.84	±11.44	
Detroit,MI	2160	364	  0	  0	 96	 28.5	(90)	 27.5	(90)	 42.5	(92)	 30.0	(92)	 31.5	34.47	±17.32	
Fargo-Moorhead,ND-MN	2520	120	  0	  2	 98	 10.0	(30)	 14.0	(30)	 19.0	(30)	 13.5	(30)	 14.0	16.16	±11.48	
Fayetteville,NC	2560	 57	  0	  7	 42	 16.5	(14)	 19.0	(15)	 23.0	(13)	 15.0	(15)	 17.0	18.84	±7.95	
Fort Lauderdale,FL	2680	 62	  0	  9	 43	 18.0	(16)	 16.0	(15)	 17.5	(16)	 14.0	(15)	 16.0	17.26	±6.50	
Fort Wayne,IN	2760	286	  0	  5	 78	 18.0	(88)	 24.0	(71)	 27.0	(86)	 17.0	(41)	 21.5	25.82	±15.09	
Fort Worth-Arlington,TX	2800	 61	  0	  6	 48	 17.0	(15)	 19.0	(15)	 19.0	(16)	 17.0	(15)	 18.0	19.43	±8.45	
Gary,IN	2960	365	  1	  6	119	 19.0	(90)	 25.0	(91)	 31.0	(92)	 19.5	(92)	 24.0	27.17	±13.81	
Grand Rapids-Muskegon-Holland,MI	3000	 60	  0	  6	 49	 16.0	(15)	 19.0	(15)	 22.0	(15)	 14.0	(15)	 16.0	18.68	±9.05	
Greensboro-Winston Salem-High Point,NC	3120	365	  0	  5	 53	 18.0	(90)	 21.0	(91)	 26.0	(92)	 16.5	(92)	 19.0	21.12	±9.04	
Greenville-Spartanburg-Anderson,SC	3160	327	  0	  2	 50	 14.0	(88)	 21.0	(64)	 24.0	(83)	 19.5	(92)	 19.0	20.29	±9.18	
Hartford,CN	3280	 61	  0	  2	 61	 12.0	(15)	 13.0	(15)	 11.5	(16)	  9.0	(15)	 12.0	14.21	±10.27	
Honolulu,HI	3320	365	  0	  6	 74	 17.0	(90)	 14.0	(91)	 13.0	(92)	 14.0	(92)	 14.0	15.09	±5.96	
Houston,TX	3360	120	  0	  6	 78	 33.5	(30)	 34.0	(27)	 38.0	(31)	 26.0	(32)	 33.0	34.36	±15.36	
Huntington-Ashland,WV-KY-OH	3400	352	  0	  5	 58	 14.0	(87)	 20.5	(88)	 28.0	(87)	 14.5	(90)	 18.0	20.49	±10.68	
Indianapolis,IN	3480	 61	  0	  9	 52	 23.0	(15)	 19.0	(15)	 26.0	(16)	 20.0	(15)	 23.0	23.64	±9.65	
Jacksonville,FL	3600	356	  0	  0	 97	 21.0	(86)	 27.0	(90)	 19.0	(91)	 19.0	(89)	 20.5	24.44	±14.45	
Jacksonville,NC	3605	 55	  0	  6	 33	 11.0	(15)	 13.0	(14)	 18.5	(16)	 11.0	(10)	 13.0	14.76	±6.54	
Jersey City,NJ	3640	 52	  0	  8	 78	 23.0	(13)	 21.5	(10)	 26.0	(16)	 19.0	(13)	 21.0	26.13	±14.97	
Kansas City,MO-KS	3760	 61	  0	 16	 60	 27.0	(15)	 26.0	(15)	 41.5	(16)	 34.0	(15)	 37.0	35.20	±11.58	
Knoxville,TN	3840	365	  0	  2	 96	 24.0	(90)	 37.0	(91)	 36.0	(92)	 24.0	(92)	 29.0	32.73	±17.30	
Las Cruces,NM	4100	 65	  1	 14	142	 32.0	(15)	 44.0	(18)	 28.0	(17)	 35.0	(15)	 32.0	38.83	±22.96	
Las Vegas,NV-AZ	4120	365	 11	 17	431	 51.0	(90)	 47.0	(91)	 52.0	(92)	 53.0	(92)	 51.0	53.09	±29.38	
Lexington,KY	4280	353	  0	  5	 72	 14.0	(87)	 20.0	(89)	 25.0	(87)	 15.0	(90)	 17.0	19.63	±10.17	
Little Rock-North Little Rock,AR	4400	 55	  0	  8	 52	 19.0	(14)	 22.0	(14)	 27.0	(15)	 21.0	(12)	 21.0	23.75	±9.99	
Los Angeles-Long Beach,CA	4480	361	  1	  2	128	 19.0	(89)	 27.5	(88)	 36.0	(92)	 26.0	(92)	 27.0	29.80	±15.66	
Louisville,KY-IN	4520	181	  0	  8	 56	 19.0	(15)	 25.0	(15)	 31.0	(61)	 16.0	(90)	 19.0	22.63	±10.60	
Memphis,TN-AR-MS	4920	212	  0	  5	 54	 13.0	(90)	 10.0	(51)	 21.0	(55)	 18.5	(16)	 14.0	16.19	±8.87	
Miami,FL	5000	 61	  0	 11	 47	 24.0	(15)	 23.0	(15)	 20.5	(16)	 21.0	(15)	 22.0	23.15	±8.17	
Milwaukee-Waukesha,WI	5080	 61	  0	  7	 49	 21.0	(15)	 16.0	(15)	 29.5	(16)	 21.0	(15)	 21.0	23.95	±11.64	
Minneapolis-St. Paul,MN-WI	5120	194	  0	  6	 71	 28.0	(65)	 23.0	(62)	 24.0	(41)	 25.5	(26)	 26.0	28.27	±12.74	
Mobile,AL	5160	158	  0	  0	 83	 24.0	(15)	 21.0	(91)	 26.0	(37)	 24.0	(15)	 22.0	25.81	±15.05	
Nashville,TN	5360	 61	  0	  9	 51	 21.0	(15)	 24.0	(15)	 32.5	(16)	 14.0	(15)	 23.0	24.41	±10.73	
Nassau-Suffolk,NY	5380	 56	  0	  6	 66	 13.0	(15)	 14.0	(14)	 14.0	(15)	 13.0	(12)	 13.0	16.07	±10.21	
New Haven-Meriden,CT	5480	353	  0	  3	 71	 31.0	(85)	 27.0	(91)	 31.0	(91)	 28.5	(86)	 30.0	30.68	±13.34	
New London-Norwich,CT-RI	5520	 55	  0	  2	 59	 10.0	(13)	 10.0	(13)	 13.0	(15)	 11.0	(14)	 10.0	13.45	±9.27	
New Orleans,LA	5560	 61	  0	  6	 61	 24.0	(15)	 25.0	(15)	 25.0	(16)	 19.0	(15)	 23.0	24.61	±10.95	
New York,NY	5600	337	  0	  6	 70	 25.0	(90)	 26.5	(90)	 26.0	(65)	 19.0	(92)	 24.0	25.41	±10.07	
Newark,NJ	5640	 61	  0	 10	 80	 22.0	(15)	 25.0	(15)	 25.0	(16)	 21.0	(15)	 23.0	26.56	±13.92	
Norfolk-Virginia Beach-Newport News,VA_NC	5720	 61	  0	  6	 36	 13.0	(15)	 17.0	(15)	 19.5	(16)	 12.0	(15)	 15.0	16.54	±7.05	
Oakland,CA	5775	 65	  0	  8	 60	 21.0	(17)	 24.0	(16)	 26.0	(16)	 35.0	(16)	 25.0	26.34	±12.10	
Oklahoma City,OK	5880	 61	  0	  7	 47	 18.0	(14)	 21.5	(16)	 26.5	(16)	 18.0	(15)	 20.0	22.74	±9.53	
Omaha,NE-IA	5920	353	  0	  2	 97	 23.5	(86)	 31.0	(89)	 30.5	(90)	 31.0	(88)	 30.0	31.70	±15.85	
Orange County,CA	5945	 66	  0	 11	 63	 37.0	(15)	 27.5	(18)	 30.0	(17)	 30.0	(16)	 30.0	31.86	±11.06	
Orlando,FL	5960	364	  0	  6	 50	 18.0	(90)	 19.0	(91)	 16.0	(91)	 16.0	(92)	 17.0	17.51	±5.90	
Philadelphia,PA-NJ	6160	365	  0	  6	 87	 21.0	(90)	 21.0	(91)	 25.5	(92)	 16.5	(92)	 21.0	23.57	±11.77	
Phoenix-Mesa,AZ	6200	330	  4	 11	199	 42.0	(82)	 41.0	(86)	 39.0	(78)	 40.0	(84)	 40.0	43.95	±18.81	
Pittsburgh,PA	6280	365	  0	  5	 88	 28.0	(90)	 40.0	(91)	 44.0	(92)	 25.5	(92)	 32.0	36.04	±17.44	
Pocatello,ID	6340	343	  0	  3	 84	 20.0	(88)	 18.0	(80)	 20.0	(83)	 18.5	(92)	 19.0	21.87	±12.45	
Portland,ME	6400	 60	  0	  8	 55	 24.5	(14)	 19.0	(15)	 18.5	(16)	 18.0	(15)	 19.0	23.87	±13.02	
Portland-Vancouver,OR-WA	6440	123	  0	  2	 66	 12.0	(64)	 13.0	(19)	 16.0	(18)	 22.5	(22)	 14.0	16.24	±10.17	
Providence-Fall River-Warwick,RI-MA	6480	 66	  0	  8	 66	 19.5	(16)	 16.0	(19)	 20.0	(16)	 15.0	(15)	 19.0	21.02	±11.25	
Provo-Orem,UT	6520	356	  1	  4	167	 27.0	(87)	 27.5	(90)	 36.0	(88)	 21.0	(91)	 28.0	29.39	±16.20	
Raleigh-Durham-Chapel Hill,NC	6640	363	  0	  4	 54	 15.0	(90)	 20.0	(91)	 23.0	(92)	 15.0	(90)	 18.0	19.22	±8.86	
Rapid City,SD	6660	339	  2	  4	118	 30.0	(89)	 31.0	(91)	 34.0	(85)	 31.0	(74)	 31.0	35.19	±17.34	
Reno,NV	6720	 61	  0	  6	 72	 39.0	(15)	 30.0	(15)	 37.0	(16)	 37.0	(15)	 36.0	38.07	±14.97	
Richmond-Petersburg,VA	6760	 60	  0	  6	 44	 13.0	(15)	 17.0	(15)	 24.0	(15)	 11.0	(15)	 16.5	16.75	±7.63	
Riverside-San Bernardino,CA	6780	364	  6	  6	418	 30.0	(90)	 38.0	(90)	 41.5	(92)	 33.0	(92)	 36.0	41.60	±31.92	
St, Louis,MO-IL	7040	365	 15	  9	193	 47.0	(90)	 47.0	(91)	 55.0	(92)	 44.5	(92)	 49.0	50.47	±24.75	
Salt Lake City-Ogden,UT	7160	364	  2	  7	150	 40.5	(90)	 32.0	(90)	 40.5	(92)	 34.5	(92)	 37.0	38.17	±17.79	
San Antonio,TX	7240	 60	  0	  6	 57	 22.0	(15)	 19.0	(15)	 29.5	(16)	 20.0	(14)	 22.5	24.95	±11.45	
San Diego,CA	7320	 70	  0	 15	 88	 52.0	(17)	 37.0	(15)	 49.0	(17)	 40.0	(21)	 43.5	44.46	±17.15	
Santa Fe,NM	7490	 93	  0	  4	 35	  8.0	(45)	 19.0	(15)	 13.0	(17)	 13.0	(16)	 11.0	12.10	±6.21	
Seattle-Bellevue-Everett,WA	7600	 61	  0	  6	 59	 21.0	(15)	 18.0	(15)	 18.0	(16)	 21.0	(15)	 19.0	21.28	±10.29	
Shreveport-Bossier City,LA	7680	 61	  0	  6	 56	 14.0	(15)	 19.0	(15)	 19.0	(16)	 17.0	(15)	 17.0	19.69	±10.66	
Sioux Falls,SD	7760	331	  0	  5	 73	 13.0	(90)	 18.0	(76)	 20.0	(84)	 16.0	(81)	 16.0	18.21	±9.31	
Spokane,WA	7840	361	  0	  5	 74	 18.0	(87)	 21.0	(91)	 31.0	(91)	 24.5	(92)	 24.0	27.15	±14.68	
Springfield,MA	8000	 63	  0	  6	 62	 19.0	(15)	 21.0	(15)	 19.0	(16)	 16.0	(17)	 19.0	21.54	±11.04	
Tacoma,WA	8200	 60	  0	  5	 70	 16.0	(15)	 14.0	(15)	 18.0	(15)	 19.0	(15)	 18.0	18.83	±12.28	
Tampa-St. Petersburg-Clearwater,FL	8280	365	  0	  9	 63	 26.0	(90)	 27.0	(91)	 24.0	(92)	 24.0	(92)	 25.0	26.02	±8.29	
Topeka,KS	8440	 59	  0	 10	 58	 17.0	(15)	 16.0	(15)	 23.5	(14)	 17.0	(15)	 17.0	20.00	±9.08	
Tucson,AZ	8520	365	  2	 11	123	 33.0	(90)	 41.0	(91)	 28.5	(92)	 32.0	(92)	 34.0	36.19	±14.44	
Tusla,OK	8560	 64	  0	  8	 49	 17.0	(17)	 21.0	(15)	 33.0	(17)	 16.0	(15)	 20.0	23.16	±10.53	
Washington,DC-MD-VA-WV	8840	 62	  0	  6	 67	 24.0	(15)	 27.0	(15)	 29.0	(17)	 20.0	(15)	 26.5	28.24	±11.81	
Wichita,KS	9040	365	  0	  3	 83	 22.0	(90)	 24.0	(91)	 34.0	(92)	 18.0	(92)	 23.0	25.13	±11.94	
Wilmington-Newark,DE-MD	9160	 59	  0	  6	 82	 15.0	(15)	 20.0	(15)	 20.0	(15)	 14.0	(14)	 19.0	20.56	±12.47	
Wilmington,NC	9200	 61	  0	  6	 36	 12.0	(15)	 12.0	(15)	 17.0	(16)	 12.0	(15)	 13.0	14.52	±6.69