Air quality in Tennessee
EPA monitors report from 23 of Tennessee’s 95 counties. That is the honest limit of this page: the other 72 are not measured, not clean. In 2025 the most affected monitored county was Shelby County, with 5 days above the moderate category.
23
Counties with monitors
72
Counties without
13
Days above moderate, 2025
Summed across monitored counties
11%
Adults with asthma
Population-weighted county estimate
County by county
Monitored Tennessee counties
GoodModerateUnhealthy for sensitive groupsUnhealthyVery unhealthyHazardous
| County | 90th %ile AQI | Above moderate | Max AQI | 2025 days by category |
|---|---|---|---|---|
| Shelby County | 67 | 5 | 147 | |
| Hamilton County | 61 | 2 | 141 | |
| Anderson County | 48 | 1 | 105 | |
| Blount County | 57 | 1 | 101 | |
| Davidson County | 64 | 1 | 136 | |
| Knox County | 60 | 1 | 156 | |
| Montgomery County | 54 | 1 | 130 | |
| Sumner County | 62 | 1 | 119 | |
| Claiborne County | 45 | 0 | 100 | |
| DeKalb County | 46 | 0 | 84 | |
| Dyer County | 55 | 0 | 72 | |
| Jefferson County | 50 | 0 | 93 | |
| Lawrence County | 53 | 0 | 68 | |
| Loudon County | 53 | 0 | 100 | |
| Madison County | 56 | 0 | 96 | |
| Maury County | 53 | 0 | 74 | |
| McMinn County | 56 | 0 | 71 | |
| Putnam County | 51 | 0 | 66 | |
| Roane County | 52 | 0 | 68 | |
| Sevier County | 47 | 0 | 84 | |
| Sullivan County | 55 | 0 | 90 | |
| Williamson County | 51 | 0 | 100 | |
| Wilson County | 48 | 0 | 77 |
EPA Air Quality System annual summaries by county, 2025. The 90th percentile AQI describes a day worse than nine out of ten, which is a steadier measure than the annual maximum a single wildfire can set.
Not measured
72 counties without a monitor
No EPA monitor reported from these counties, so there is no air quality record to publish. Their radon zone is known, and radon is measured in the building rather than the air outside it.
- Bedford County
- Benton County
- Bledsoe County
- Bradley County
- Campbell County
- Cannon County
- Carroll County
- Carter County
- Cheatham County
- Chester County
- Clay County
- Cocke County
- Coffee County
- Crockett County
- Cumberland County
- Decatur County
- Dickson County
- Fayette County
- Fentress County
- Franklin County
- Gibson County
- Giles County
- Grainger County
- Greene County
- Grundy County
- Hamblen County
- Hancock County
- Hardeman County
- Hardin County
- Hawkins County
- Haywood County
- Henderson County
- Henry County
- Hickman County
- Houston County
- Humphreys County
- Jackson County
- Johnson County
- Lake County
- Lauderdale County
- Lewis County
- Lincoln County
- Macon County
- Marion County
- Marshall County
- McNairy County
- Meigs County
- Monroe County
- Moore County
- Morgan County
- Obion County
- Overton County
- Perry County
- Pickett County
- Polk County
- Rhea County
- Robertson County
- Rutherford County
- Scott County
- Sequatchie County
- Smith County
- Stewart County
- Tipton County
- Trousdale County
- Unicoi County
- Union County
- Van Buren County
- Warren County
- Washington County
- Wayne County
- Weakley County
- White County
Other states
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