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	  0	  2	 99	 17.0	(90)	 23.0	(91)	 21.5	(92)	 36.0	(91)	 24.5	28.72	±16.27	
Asheville,NC	 480	 54	  0	  5	 81	 11.0	(15)	 19.0	(16)	 19.0	(13)	 20.5	(10)	 15.0	17.07	±11.53	
Atlanta,GA	 520	365	  0	  6	 99	 18.0	(90)	 28.0	(91)	 34.0	(92)	 22.5	(92)	 25.0	28.06	±15.31	
Augusta-Aiken,GA	 600	 61	  0	  6	 59	 14.0	(15)	 21.5	(16)	 18.5	(14)	 13.0	(16)	 16.0	18.57	±10.65	
Austin-San Marcos,TX	 640	 57	  0	  5	 34	 15.0	(14)	 21.0	(15)	 19.5	(14)	 16.5	(14)	 19.0	19.32	±6.95	
Baltimore,MD	 720	 61	  0	  7	 61	 26.0	(15)	 30.5	(16)	 31.0	(15)	 29.0	(15)	 30.0	30.44	±12.42	
Baton Rouge,LA	 760	 61	  0	  8	 55	 29.0	(15)	 28.0	(16)	 32.0	(15)	 27.0	(15)	 28.0	30.46	±12.05	
Bergen-Passaic,NJ	 875	 43	  0	  7	 69	 28.5	(4)	 31.0	(13)	 38.0	(14)	 25.5	(12)	 31.0	33.53	±15.50	
Biloxi-Gulfport-Pascagoula,MS	 920	 57	  0	  6	 39	 12.0	(13)	 19.0	(15)	 15.0	(15)	 15.0	(14)	 16.0	16.54	±5.93	
Birmingham,AL	1000	365	  1	  7	116	 23.5	(90)	 33.0	(91)	 35.5	(92)	 46.0	(92)	 33.0	37.85	±19.35	
Bismarck,ND	1010	 55	  0	  5	 65	  9.5	(14)	 21.5	(14)	 21.0	(12)	 16.0	(15)	 15.0	18.29	±10.64	
Boise City,ID	1080	363	  0	  6	 82	 30.0	(89)	 27.0	(91)	 37.0	(92)	 23.0	(91)	 29.0	31.02	±14.59	
Boston,MA-NH	1120	 64	  0	  6	 67	 29.0	(15)	 26.0	(18)	 24.0	(15)	 22.0	(16)	 24.0	27.80	±11.33	
Burlington,VT	1305	 58	  0	  2	 47	 14.0	(13)	 12.0	(16)	 13.0	(14)	 10.0	(15)	 12.0	13.48	±8.50	
Casper,WY	1350	 56	  0	  4	 48	 14.0	(13)	 19.0	(14)	 18.0	(15)	 13.0	(14)	 16.0	17.45	±9.36	
Charleston-North Charleston,SC	1440	343	  0	  6	 57	 18.0	(69)	 22.0	(91)	 20.0	(91)	 18.0	(92)	 19.0	20.11	±7.14	
Charleston,WV	1480	 61	  0	  6	 55	 16.0	(15)	 20.0	(16)	 30.0	(15)	 15.0	(15)	 20.0	22.75	±11.54	
Charlotte-Gastonia-Rock Hill,NC-SC	1520	 62	  0	  9	 60	 27.0	(15)	 28.0	(16)	 28.0	(15)	 29.0	(16)	 27.5	28.66	±11.41	
Cheyenne,WY	1580	 59	  0	  5	 37	  7.0	(15)	 18.5	(16)	 15.0	(13)	 12.0	(15)	 14.0	14.46	±7.21	
Chicago,IL	1600	365	  0	  8	 92	 29.0	(90)	 34.0	(91)	 34.5	(92)	 39.5	(92)	 33.0	36.08	±16.55	
Cincinnati,OH-KY-IN	1640	365	  0	  5	 64	 18.0	(90)	 25.0	(91)	 26.0	(92)	 17.5	(92)	 20.0	23.06	±12.01	
Cleveland-Lorain-Elyria,OH	1680	365	  0	  7	 87	 36.0	(90)	 47.0	(91)	 38.5	(92)	 30.5	(92)	 38.0	39.45	±16.38	
Columbia,SC	1760	357	  0	  6	 96	 31.0	(85)	 38.5	(88)	 41.0	(92)	 41.5	(92)	 38.0	38.74	±17.59	
Columbus,OH	1840	324	  0	  5	 68	 19.0	(79)	 26.0	(85)	 27.5	(92)	 18.5	(68)	 23.0	25.61	±13.17	
Dallas,TX	1920	 62	  0	 16	 58	 30.0	(15)	 33.0	(16)	 33.0	(15)	 30.0	(16)	 32.0	32.74	±9.80	
Denver,CO	2080	365	  0	  9	 94	 39.0	(90)	 36.0	(91)	 37.5	(92)	 37.5	(92)	 37.0	38.45	±14.72	
Des Moines,IA	2120	355	  0	  2	 68	 18.0	(87)	 25.0	(85)	 30.0	(92)	 27.0	(91)	 24.0	28.01	±13.81	
Detroit,MI	2160	348	  0	  2	 90	 24.0	(80)	 36.0	(84)	 32.5	(92)	 31.0	(92)	 31.0	33.83	±17.17	
Fayetteville,NC	2560	 57	  0	  7	 41	 19.0	(13)	 22.5	(14)	 22.0	(15)	 16.0	(15)	 19.0	19.96	±7.20	
Fort Lauderdale,FL	2680	 61	  0	  9	 44	 20.0	(15)	 21.0	(16)	 16.0	(15)	 14.0	(15)	 19.0	19.69	±7.28	
Fort Wayne,IN	2760	122	  0	  4	 71	 17.0	(15)	 23.0	(16)	 21.5	(14)	 14.0	(77)	 17.0	18.73	±11.20	
Fort Worth-Arlington,TX	2800	 61	  0	  8	 63	 16.0	(15)	 19.0	(16)	 19.0	(15)	 15.0	(15)	 19.0	18.95	±8.31	
Gary,IN	2960	363	  1	  6	127	 24.0	(90)	 31.0	(91)	 26.0	(90)	 19.0	(92)	 25.0	28.79	±15.72	
Grand Rapids-Muskegon-Holland,MI	3000	 63	  0	  6	 59	 17.0	(16)	 19.0	(17)	 23.0	(15)	 17.0	(15)	 19.0	21.98	±11.84	
Greensboro-Winston Salem-High Point,NC	3120	365	  0	  4	 61	 15.0	(90)	 27.0	(91)	 26.0	(92)	 19.0	(92)	 21.0	22.72	±9.96	
Greenville-Spartanburg-Anderson,SC	3160	340	  0	  3	 51	 17.0	(72)	 22.0	(86)	 23.5	(92)	 19.0	(90)	 20.0	21.54	±9.15	
Hartford,CN	3280	 61	  0	  5	 48	 22.0	(15)	 13.0	(16)	 12.0	(15)	 14.0	(15)	 15.0	17.41	±8.90	
Honolulu,HI	3320	365	  1	  7	106	 17.0	(90)	 14.0	(91)	 13.0	(92)	 20.5	(92)	 15.0	18.51	±11.91	
Houston,TX	3360	116	  0	  9	 78	 28.0	(29)	 39.0	(30)	 46.0	(27)	 33.5	(30)	 38.0	37.66	±15.46	
Huntington-Ashland,WV-KY-OH	3400	342	  0	  2	 63	 19.0	(84)	 32.0	(87)	 28.5	(88)	 19.0	(83)	 23.5	25.73	±14.19	
Indianapolis,IN	3480	 66	  0	  9	 54	 26.0	(16)	 30.0	(19)	 20.0	(15)	 27.5	(16)	 25.5	25.76	±9.98	
Jackson,MS	3560	350	  0	  5	 79	 15.0	(89)	 20.0	(91)	 19.0	(78)	 16.5	(92)	 18.0	19.00	±8.57	
Jacksonville,FL	3600	359	  2	  1	117	 22.0	(90)	 26.0	(90)	 19.0	(91)	 25.5	(88)	 24.0	26.60	±15.33	
Jacksonville,NC	3605	 59	  0	  6	 31	 12.0	(15)	 15.0	(16)	 18.0	(13)	 10.0	(15)	 14.0	14.36	±5.58	
Jersey City,NJ	3640	 53	  0	  6	 59	 25.0	(14)	 25.0	(14)	 29.5	(12)	 21.0	(13)	 25.0	26.79	±12.91	
Kansas City,MO-KS	3760	 61	  0	 16	 60	 29.0	(15)	 37.5	(16)	 38.0	(15)	 27.0	(15)	 33.0	33.98	±11.55	
Knoxville,TN	3840	365	  0	  3	 82	 21.0	(90)	 36.0	(91)	 34.0	(92)	 27.5	(92)	 30.0	32.46	±16.70	
Las Cruces,NM	4100	 64	  0	  6	 75	 27.5	(16)	 46.0	(17)	 23.0	(16)	 35.0	(15)	 31.0	34.81	±18.00	
Las Vegas,NV-AZ	4120	365	  3	 12	157	 37.0	(90)	 51.0	(91)	 51.5	(92)	 53.0	(92)	 48.0	48.21	±17.26	
Lexington,KY	4280	341	  0	  4	 54	 15.0	(84)	 22.0	(83)	 25.0	(87)	 14.0	(87)	 19.0	20.52	±10.29	
Little Rock-North Little Rock,AR	4400	 54	  0	  9	 58	 19.0	(14)	 28.0	(16)	 32.0	(15)	 29.0	(9)	 25.0	27.00	±11.43	
Los Angeles-Long Beach,CA	4480	348	  0	  4	 85	 20.0	(78)	 29.0	(91)	 29.0	(90)	 22.0	(89)	 26.0	28.50	±15.07	
Louisville,KY-IN	4520	 65	  0	  6	 66	 30.0	(15)	 30.0	(18)	 32.5	(16)	 29.0	(16)	 31.0	31.91	±12.65	
Memphis,TN-AR-MS	4920	354	  0	  6	 53	 18.0	(87)	 25.5	(86)	 22.0	(90)	 17.0	(91)	 21.0	21.72	±9.17	
Miami,FL	5000	 61	  0	 12	 51	 27.0	(15)	 22.0	(16)	 19.0	(15)	 22.0	(15)	 23.0	25.48	±9.68	
Milwaukee-Waukesha,WI	5080	 63	  0	  8	 47	 24.5	(16)	 17.0	(17)	 19.0	(15)	 20.0	(15)	 20.0	22.38	±9.00	
Minneapolis-St. Paul,MN-WI	5120	248	  0	  5	 66	 33.5	(64)	 24.0	(65)	 26.5	(64)	 26.0	(55)	 28.0	29.28	±12.61	
Mobile,AL	5160	 61	  0	  7	 83	 31.0	(15)	 45.5	(16)	 38.0	(15)	 38.0	(15)	 38.0	39.80	±14.80	
Nashville,TN	5360	 62	  0	 10	 54	 27.0	(15)	 30.0	(17)	 30.0	(15)	 29.0	(15)	 29.5	29.74	±10.91	
Nassau-Suffolk,NY	5380	 56	  0	  6	 54	 15.0	(13)	 14.0	(15)	 16.0	(15)	 14.0	(13)	 14.0	16.07	±8.44	
New Haven-Meriden,CT	5480	351	  0	  5	 72	 36.0	(87)	 38.0	(85)	 31.0	(92)	 29.0	(87)	 32.0	33.65	±14.81	
New London-Norwich,CT-RI	5520	 49	  0	  2	 47	 18.0	(14)	  9.5	(10)	 15.0	(14)	 10.0	(11)	 14.0	15.94	±9.27	
New Orleans,LA	5560	 61	  0	  9	 56	 23.0	(15)	 27.5	(16)	 26.0	(15)	 28.0	(15)	 27.0	29.02	±10.95	
New York,NY	5600	 61	  0	  7	 52	 19.0	(15)	 17.0	(16)	 19.0	(15)	 17.0	(15)	 17.0	20.41	±9.66	
Newark,NJ	5640	 61	  0	  6	 63	 31.0	(15)	 29.0	(16)	 32.0	(15)	 29.0	(15)	 30.0	30.00	±12.78	
Norfolk-Virginia Beach-Newport News,VA_N	5720	 61	  0	  7	 43	 17.0	(15)	 20.0	(16)	 19.0	(15)	 14.0	(15)	 18.0	18.92	±7.79	
Oakland,CA	5775	 65	  0	  7	 77	 20.5	(16)	 18.5	(18)	 21.0	(15)	 26.5	(16)	 22.0	24.43	±13.24	
Oklahoma City,OK	5880	 65	  0	  8	 45	 21.0	(15)	 21.5	(16)	 24.0	(16)	 15.5	(18)	 21.0	22.71	±8.97	
Omaha,NE-IA	5920	358	  1	  2	113	 23.0	(90)	 28.0	(91)	 30.0	(91)	 27.0	(86)	 28.0	29.98	±17.06	
Orange County,CA	5945	 63	  0	  5	 70	 31.0	(17)	 27.0	(16)	 23.0	(15)	 36.0	(15)	 26.0	30.92	±12.60	
Orlando,FL	5960	365	  0	  6	 54	 19.0	(90)	 23.0	(91)	 19.0	(92)	 16.0	(92)	 19.0	19.78	±7.34	
Philadelphia,PA-NJ	6160	365	  0	  5	 59	 18.0	(90)	 24.0	(91)	 25.0	(92)	 22.0	(92)	 22.0	24.77	±11.65	
Phoenix-Mesa,AZ	6200	326	  6	  6	163	 34.0	(82)	 38.0	(79)	 35.5	(84)	 43.0	(81)	 37.0	41.13	±21.85	
Pittsburgh,PA	6280	365	  0	  7	 90	 28.0	(90)	 41.0	(91)	 44.5	(92)	 42.0	(92)	 40.0	40.41	±17.47	
Pocatello,ID	6340	357	  1	  3	128	 24.0	(89)	 26.0	(89)	 30.0	(87)	 21.5	(92)	 25.0	28.16	±14.91	
Portland,ME	6400	 61	  0	  6	 56	 36.0	(15)	 23.5	(16)	 18.0	(15)	 19.0	(15)	 19.0	25.16	±13.31	
Portland-Vancouver,OR-WA	6440	184	  0	  2	 51	 16.0	(89)	 15.0	(17)	 15.0	(16)	  9.5	(62)	 14.0	15.26	±8.12	
Providence-Fall River-Warwick,RI-MA	6480	 63	  0	  7	 71	 33.0	(15)	 28.0	(17)	 20.0	(15)	 21.5	(16)	 23.0	28.19	±13.21	
Provo-Orem,UT	6520	357	  0	  2	 79	 22.0	(90)	 28.0	(87)	 35.0	(89)	 29.0	(91)	 29.0	30.30	±15.13	
Raleigh-Durham-Chapel Hill,NC	6640	282	  0	  4	 51	 15.0	(85)	 26.0	(16)	 20.0	(90)	 18.0	(91)	 19.0	19.22	±8.54	
Rapid City,SD	6660	354	  1	  4	110	 26.0	(90)	 36.0	(87)	 34.0	(89)	 34.5	(88)	 31.0	35.10	±17.94	
Reno,NV	6720	 66	  0	  6	 91	 48.0	(15)	 38.5	(20)	 40.0	(16)	 36.0	(15)	 40.0	41.67	±17.08	
Richmond-Petersburg,VA	6760	 58	  0	  7	 44	 13.0	(15)	 21.0	(14)	 21.0	(15)	 15.5	(14)	 16.0	18.86	±8.75	
Riverside-San Bernardino,CA	6780	361	  7	  3	500	 22.0	(87)	 35.0	(91)	 35.5	(92)	 30.0	(91)	 31.0	38.43	±32.94	
St, Louis,MO-IL	7040	365	  8	  8	127	 35.5	(90)	 47.0	(91)	 44.0	(92)	 44.5	(92)	 42.0	45.16	±22.20	
Salt Lake City-Ogden,UT	7160	362	  2	  6	124	 34.0	(89)	 38.0	(89)	 42.0	(92)	 41.0	(92)	 39.0	39.93	±17.29	
San Antonio,TX	7240	 61	  0	  7	 90	 19.0	(15)	 20.5	(16)	 27.0	(15)	 19.0	(15)	 20.0	24.21	±13.99	
San Diego,CA	7320	 73	  0	 22	 77	 48.0	(20)	 33.0	(17)	 36.0	(17)	 46.0	(19)	 41.0	42.97	±14.12	
Santa Fe,NM	7490	177	  0	  2	 31	 10.0	(43)	 13.0	(44)	 10.0	(44)	  9.0	(46)	 10.0	11.24	±4.42	
Seattle-Bellevue-Everett,WA	7600	 63	  0	  8	 60	 26.0	(17)	 16.0	(16)	 20.0	(15)	 21.0	(15)	 20.0	22.41	±10.41	
Shreveport-Bossier City,LA	7680	 58	  0	  7	 46	 14.0	(13)	 20.0	(16)	 24.0	(14)	 21.0	(15)	 20.0	20.09	±8.04	
Sioux Falls,SD	7760	353	  0	  2	 81	  9.5	(90)	 18.0	(89)	 22.0	(82)	 16.0	(92)	 16.0	18.83	±11.70	
Spokane,WA	7840	365	  1	  2	153	 25.0	(90)	 18.0	(91)	 31.0	(92)	 19.0	(92)	 23.0	26.65	±15.46	
Springfield,MA	8000	 66	  0	  5	 55	 15.5	(16)	 20.0	(18)	 20.0	(17)	 17.0	(15)	 19.0	21.42	±10.97	
Tacoma,WA	8200	 61	  0	  5	 52	 21.0	(15)	 13.5	(16)	 19.0	(15)	 18.0	(15)	 19.0	19.21	±10.21	
Tampa-St. Petersburg-Clearwater,FL	8280	365	  0	  4	 78	 24.5	(90)	 31.0	(91)	 25.0	(92)	 23.0	(92)	 26.0	26.88	±9.72	
Topeka,KS	8440	 71	  0	  4	 42	 12.0	(27)	 22.0	(14)	 21.0	(15)	 20.0	(15)	 18.0	18.15	±8.27	
Tucson,AZ	8520	365	  0	  9	 90	 27.5	(90)	 31.0	(91)	 30.0	(92)	 33.5	(92)	 30.0	31.66	±11.65	
Tusla,OK	8560	 63	  2	  8	121	 28.0	(15)	 26.0	(17)	 27.5	(16)	 16.0	(15)	 24.0	29.57	±20.51	
Washington,DC-MD-VA-WV	8840	 63	  0	 10	 56	 19.0	(15)	 34.5	(18)	 29.0	(15)	 27.0	(15)	 28.0	28.86	±12.36	
Wichita,KS	9040	365	  0	  6	 67	 16.0	(90)	 29.0	(91)	 31.0	(92)	 22.0	(92)	 23.0	25.44	±11.72	
Wilmington-Newark,DE-MD	9160	 50	  0	  4	 44	 17.0	(15)	 20.0	(8)	 20.0	(14)	 13.0	(13)	 17.5	19.58	±9.84	
Wilmington,NC	9200	 58	  0	  6	 30	 12.0	(15)	 18.0	(15)	 16.0	(13)	 10.0	(15)	 15.0	14.76	±5.61