| 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
Atlanta,GA | 520 | 365 | 0 | 1 | 29 | 4.0 | (90) | 4.0 | (91) | 3.0 | (92) | 4.0 | (92) | 4.0 | 5.69 | ±4.97
Austin-San Marcos,TX | 640 | 195 | 0 | 1 | 4 | . | (.) | 1.0 | (72) | 1.0 | (92) | 1.0 | (31) | 1.0 | 1.11 | ±0.47
Baltimore,MD | 720 | 363 | 0 | 1 | 29 | 9.0 | (90) | 4.0 | (89) | 6.0 | (92) | 7.0 | (92) | 7.0 | 7.83 | ±5.24
Bergen-Passaic,NJ | 875 | 364 | 0 | 1 | 28 | 6.0 | (90) | 4.0 | (91) | 4.0 | (92) | 6.0 | (91) | 4.0 | 6.19 | ±4.57
Birmingham,AL | 1000 | 365 | 0 | 1 | 25 | 4.0 | (90) | 3.0 | (91) | 4.0 | (92) | 6.0 | (92) | 4.0 | 4.81 | ±3.54
Bismarck,ND | 1010 | 266 | 0 | 1 | 22 | 4.0 | (90) | 3.0 | (89) | . | (.) | 1.0 | (87) | 3.0 | 4.44 | ±4.34
Charleston-North Charleston,SC | 1440 | 365 | 0 | 1 | 19 | 4.0 | (90) | 1.0 | (91) | 3.0 | (92) | 3.0 | (92) | 3.0 | 4.05 | ±3.60
Charleston,WV | 1480 | 361 | 0 | 1 | 47 | 12.0 | (86) | 9.0 | (91) | 12.0 | (92) | 12.0 | (92) | 12.0 | 12.98 | ±7.78
Charlotte-Gastonia-Rock Hill,NC-SC | 1520 | 364 | 0 | 1 | 25 | 4.0 | (90) | 3.0 | (91) | 3.0 | (91) | 3.5 | (92) | 3.0 | 4.36 | ±3.64
Chicago,IL | 1600 | 365 | 0 | 3 | 46 | 9.5 | (90) | 9.0 | (91) | 10.0 | (92) | 12.0 | (92) | 10.0 | 11.73 | ±6.99
Cincinnati,OH-KY-IN | 1640 | 365 | 0 | 1 | 58 | 14.0 | (90) | 18.0 | (91) | 16.0 | (92) | 12.0 | (92) | 15.0 | 16.60 | ±9.46
Cleveland-Lorain-Elyria,OH | 1680 | 365 | 0 | 3 | 79 | 15.0 | (90) | 13.0 | (91) | 16.0 | (92) | 15.0 | (92) | 15.0 | 18.35 | ±12.87
Columbia,SC | 1760 | 365 | 0 | 1 | 28 | 7.0 | (90) | 4.0 | (91) | 4.0 | (92) | 6.0 | (92) | 6.0 | 6.76 | ±4.95
Columbus,OH | 1840 | 358 | 0 | 1 | 41 | 6.0 | (90) | 4.0 | (89) | 3.0 | (88) | 6.0 | (91) | 4.0 | 5.95 | ±5.86
Dallas,TX | 1920 | 365 | 0 | 1 | 41 | 3.0 | (90) | 4.0 | (91) | 4.0 | (92) | 4.0 | (92) | 4.0 | 5.92 | ±5.57
Denver,CO | 2080 | 363 | 0 | 1 | 16 | 3.0 | (90) | 3.0 | (91) | 3.0 | (92) | 4.0 | (90) | 3.0 | 3.86 | ±2.59
Detroit,MI | 2160 | 365 | 0 | 1 | 67 | 9.0 | (90) | 10.0 | (91) | 9.5 | (92) | 7.0 | (92) | 9.0 | 12.92 | ±12.01
Fargo-Moorhead,ND-MN | 2520 | 361 | 0 | 1 | 4 | 1.0 | (90) | 1.0 | (91) | 1.0 | (92) | 1.0 | (88) | 1.0 | 1.11 | ±0.47
Fort Lauderdale,FL | 2680 | 322 | 0 | 1 | 16 | 1.0 | (90) | 1.0 | (91) | 1.0 | (71) | 1.0 | (70) | 1.0 | 1.90 | ±2.14
Grand Rapids-Muskegon-Holland,MI | 3000 | 347 | 0 | 1 | 21 | 1.0 | (83) | 1.0 | (90) | 1.0 | (84) | 1.0 | (90) | 1.0 | 2.01 | ±2.02
Greensboro-Winston Salem-High Point,NC | 3120 | 293 | 0 | 1 | 44 | 9.0 | (81) | 6.0 | (90) | 4.0 | (89) | 4.0 | (33) | 7.0 | 7.68 | ±5.63
Greenville-Spartanburg-Anderson,SC | 3160 | 364 | 0 | 1 | 25 | 4.0 | (90) | 3.0 | (91) | 3.0 | (92) | 4.0 | (91) | 3.0 | 4.21 | ±3.89
Honolulu,HI | 3320 | 365 | 0 | 1 | 13 | 3.0 | (90) | 3.0 | (91) | 1.0 | (92) | 1.0 | (92) | 1.0 | 2.32 | ±1.80
Houston,TX | 3360 | 363 | 0 | 1 | 41 | 12.0 | (90) | 10.0 | (91) | 10.0 | (90) | 12.0 | (92) | 10.0 | 11.36 | ±5.35
Huntington-Ashland,WV-KY-OH | 3400 | 365 | 0 | 4 | 73 | 16.0 | (90) | 13.0 | (91) | 12.0 | (92) | 13.0 | (92) | 13.0 | 15.88 | ±10.36
Indianapolis,IN | 3480 | 365 | 0 | 1 | 55 | 11.0 | (90) | 12.0 | (91) | 10.0 | (92) | 10.0 | (92) | 10.0 | 12.74 | ±8.66
Jackson,MS | 3560 | 361 | 0 | 1 | 9 | 1.0 | (90) | 1.0 | (91) | 1.0 | (88) | 1.0 | (92) | 1.0 | 1.66 | ±1.23
Jersey City,NJ | 3640 | 365 | 0 | 1 | 49 | 15.0 | (90) | 10.0 | (91) | 9.5 | (92) | 14.0 | (92) | 12.0 | 13.42 | ±6.98
Kansas City,MO-KS | 3760 | 365 | 0 | 1 | 67 | 6.0 | (90) | 6.0 | (91) | 7.0 | (92) | 7.0 | (92) | 7.0 | 9.69 | ±9.65
Las Cruces,NM | 4100 | 350 | 0 | 1 | 4 | 1.0 | (86) | 1.0 | (86) | 1.0 | (86) | 1.0 | (92) | 1.0 | 1.10 | ±0.45
Las Vegas,NV-AZ | 4120 | 350 | 0 | 1 | 13 | 1.0 | (90) | 10.0 | (76) | 12.0 | (92) | 10.0 | (92) | 10.0 | 8.03 | ±4.54
Little Rock-North Little Rock,AR | 4400 | 363 | 0 | 1 | 10 | 3.0 | (90) | 1.0 | (89) | 1.0 | (92) | 3.0 | (92) | 1.0 | 2.19 | ±1.50
Los Angeles-Long Beach,CA | 4480 | 365 | 0 | 1 | 16 | 7.0 | (90) | 7.0 | (91) | 10.0 | (92) | 10.0 | (92) | 10.0 | 8.85 | ±2.85
Louisville,KY-IN | 4520 | 365 | 0 | 1 | 60 | 12.5 | (90) | 13.0 | (91) | 12.5 | (92) | 12.5 | (92) | 13.0 | 14.52 | ±8.73
Memphis,TN-AR-MS | 4920 | 365 | 0 | 4 | 68 | 7.0 | (90) | 7.0 | (91) | 6.0 | (92) | 9.0 | (92) | 7.0 | 9.09 | ±7.97
Miami,FL | 5000 | 328 | 0 | 1 | 1 | 1.0 | (87) | 1.0 | (91) | 1.0 | (88) | 1.0 | (62) | 1.0 | 1.00 | ±0.00
Middlesex-Somerset-Hunterdon,NJ | 5015 | 365 | 0 | 1 | 37 | 7.0 | (90) | 4.0 | (91) | 4.0 | (92) | 6.0 | (92) | 6.0 | 6.26 | ±5.25
Milwaukee-Waukesha,WI | 5080 | 360 | 0 | 3 | 31 | 3.0 | (90) | 3.0 | (88) | 3.0 | (90) | 3.0 | (92) | 3.0 | 4.45 | ±2.91
Minneapolis-St. Paul,MN-WI | 5120 | 365 | 0 | 1 | 38 | 4.0 | (90) | 4.0 | (91) | 3.0 | (92) | 4.0 | (92) | 4.0 | 5.01 | ±5.47
Nashville,TN | 5360 | 362 | 0 | 1 | 28 | 3.0 | (90) | 3.0 | (91) | 4.0 | (89) | 6.0 | (92) | 4.0 | 4.43 | ±2.81
Nassau-Suffolk,NY | 5380 | 365 | 0 | 1 | 57 | 15.0 | (90) | 6.0 | (91) | 6.0 | (92) | 10.0 | (92) | 7.0 | 10.78 | ±9.35
New Orleans,LA | 5560 | 338 | 0 | 1 | 47 | 3.0 | (80) | 3.0 | (91) | 1.0 | (75) | 3.0 | (92) | 3.0 | 3.49 | ±4.68
New York,NY | 5600 | 365 | 0 | 1 | 61 | 24.0 | (90) | 12.0 | (91) | 9.0 | (92) | 19.0 | (92) | 15.0 | 17.68 | ±10.80
Newark,NJ | 5640 | 365 | 0 | 3 | 41 | 12.0 | (90) | 9.0 | (91) | 9.0 | (92) | 10.0 | (92) | 9.0 | 11.02 | ±6.37
Norfolk-Virginia Beach-Newport News,VA_NC | 5720 | 365 | 0 | 1 | 22 | 6.0 | (90) | 3.0 | (91) | 4.0 | (92) | 6.0 | (92) | 4.0 | 5.13 | ±3.84
Oklahoma City,OK | 5880 | 347 | 0 | 1 | 6 | 1.0 | (87) | 1.0 | (91) | 3.0 | (78) | 3.0 | (91) | 1.0 | 1.75 | ±1.11
Omaha,NE-IA | 5920 | 365 | 0 | 1 | 63 | 3.0 | (90) | 4.0 | (91) | 3.0 | (92) | 1.0 | (92) | 3.0 | 4.49 | ±7.02
Orange County,CA | 5945 | 358 | 0 | 1 | 12 | 1.0 | (84) | 1.0 | (91) | 3.0 | (92) | 1.0 | (91) | 1.0 | 2.05 | ±1.75
Orlando,FL | 5960 | 355 | 0 | 1 | 6 | 1.0 | (88) | 1.0 | (88) | 1.0 | (91) | 1.0 | (88) | 1.0 | 1.35 | ±0.82
Philadelphia,PA-NJ | 6160 | 365 | 0 | 3 | 60 | 12.0 | (90) | 9.0 | (91) | 10.0 | (92) | 12.0 | (92) | 10.0 | 12.21 | ±6.65
Phoenix-Mesa,AZ | 6200 | 365 | 0 | 1 | 12 | 3.0 | (90) | 4.0 | (91) | 3.0 | (92) | 6.0 | (92) | 4.0 | 4.50 | ±1.85
Pittsburgh,PA | 6280 | 365 | 0 | 7 | 71 | 32.0 | (90) | 21.0 | (91) | 22.0 | (92) | 24.5 | (92) | 24.0 | 28.47 | ±15.36
Portland-Vancouver,OR-WA | 6440 | 316 | 0 | 1 | 10 | 4.0 | (43) | 1.0 | (91) | 1.0 | (92) | 3.0 | (90) | 1.0 | 1.98 | ±1.48
Raleigh-Durham-Chapel Hill,NC | 6640 | 273 | 0 | 1 | 18 | 6.0 | (90) | 3.0 | (62) | 3.0 | (38) | 3.0 | (83) | 3.0 | 4.03 | ±2.80
Richmond-Petersburg,VA | 6760 | 365 | 0 | 1 | 26 | 10.0 | (90) | 7.0 | (91) | 6.0 | (92) | 7.0 | (92) | 7.0 | 8.67 | ±5.34
Riverside-San Bernardino,CA | 6780 | 365 | 0 | 1 | 16 | 4.0 | (90) | 3.0 | (91) | 12.0 | (92) | 3.0 | (92) | 4.0 | 5.63 | ±3.77
St, Louis,MO-IL | 7040 | 365 | 0 | 3 | 83 | 15.5 | (90) | 16.0 | (91) | 12.5 | (92) | 16.0 | (92) | 15.0 | 20.71 | ±14.61
Salt Lake City-Ogden,UT | 7160 | 365 | 0 | 1 | 18 | 4.0 | (90) | 4.0 | (91) | 6.0 | (92) | 6.0 | (92) | 4.0 | 5.52 | ±2.96
San Diego,CA | 7320 | 365 | 0 | 3 | 19 | 9.0 | (90) | 4.0 | (91) | 5.0 | (92) | 7.0 | (92) | 6.0 | 7.26 | ±3.47
Seattle-Bellevue-Everett,WA | 7600 | 319 | 0 | 1 | 21 | 6.0 | (71) | 3.0 | (65) | 6.0 | (91) | 3.0 | (92) | 4.0 | 5.08 | ±3.18
Sioux Falls,SD | 7760 | 365 | 0 | 1 | 9 | 1.0 | (90) | 1.0 | (91) | 1.0 | (92) | 1.0 | (92) | 1.0 | 1.47 | ±1.18
Tampa-St. Petersburg-Clearwater,FL | 8280 | 365 | 0 | 1 | 57 | 6.0 | (90) | 7.0 | (91) | 9.0 | (92) | 9.0 | (92) | 7.0 | 9.44 | ±7.30
Tucson,AZ | 8520 | 365 | 0 | 1 | 6 | 1.0 | (90) | 1.0 | (91) | 1.0 | (92) | 1.0 | (92) | 1.0 | 1.21 | ±0.67
Tulsa,OK | 8560 | 365 | 0 | 1 | 59 | 9.0 | (90) | 10.0 | (91) | 9.0 | (92) | 9.0 | (92) | 10.0 | 12.06 | ±9.25
Washington,DC-MD-VA-WV | 8840 | 365 | 0 | 3 | 31 | 15.0 | (90) | 9.0 | (91) | 7.0 | (92) | 10.0 | (92) | 10.0 | 10.97 | ±4.99
Wilmington-Newark,DE-MD | 9160 | 365 | 0 | 1 | 69 | 15.0 | (90) | 12.0 | (91) | 9.0 | (92) | 13.0 | (92) | 12.0 | 13.70 | ±9.37
Wilmington,NC | 9200 | 365 | 0 | 1 | 35 | 6.0 | (90) | 3.0 | (91) | 3.0 | (92) | 4.0 | (92) | 4.0 | 4.78 | ±4.12