Bad Air Days in Union County, Tennessee
Not enough data
EPA monitors in Union County ran on too few days between 2016 and 2025 to give a fair yearly count (about 5% of days covered). Neighbouring counties below are a better guide.
What actually helps here
- EPA monitors here ran too few days to give a fair yearly count. Use AirNow for today's air.
The record for Union
| Date | AQI | Main pollutant |
|---|---|---|
| 2016-03-31 | 19 | PM10 |
| 2016-01-31 | 17 | PM10 |
| 2016-04-30 | 17 | PM10 |
| 2016-04-06 | 15 | PM10 |
| 2016-04-18 | 15 | PM10 |
The air on a normal day
Across 20 monitored days from 2016 to 2016, the air in Union County rated Good on 100% of them, more often than the 72% typical of monitored counties, and Moderate on 0%. The median day sat at AQI 11; one day in ten went above 17.
The pollutant setting the AQI on an ordinary day here:
- coarse dust (PM10)100%20 days
Every recent year on file
| Year | Days monitored | Good | Moderate | Over 100 | Over 150 | Median AQI | Highest AQI |
|---|---|---|---|---|---|---|---|
| 2016 | 20 | 20 | 0 | 0 | 0 | 11 | 19 |
| 2015 | 365 | 344 | 21 | 0 | 0 | 19 | 96 |
| 2014 | 365 | 355 | 10 | 0 | 0 | 19 | 74 |
| 2013 | 358 | 353 | 5 | 0 | 0 | 18 | 70 |
| 2012 | 366 | 355 | 11 | 0 | 0 | 21 | 71 |
| 2011 | 364 | 343 | 21 | 0 | 0 | 22 | 67 |
| 2010 | 361 | 336 | 25 | 0 | 0 | 23 | 75 |
Tennessee compared
- Shelby County6/yr
- Davidson County3/yr
- Blount County2/yr
- Sumner County2/yr
- Knox County2/yr
- Hamilton County2/yr
- Sevier County1/yr
- Loudon County1/yr
How this is counted
A bad air day is a day the county's daily AQI from EPA AirData went above 100, the level where EPA tells children, older adults and people with asthma or heart disease to cut back outdoors. Monitors do not run every day, so yearly counts are scaled to 365 days. This is the record, not today's air: for that, check AirNow. More on the method in how the county numbers are made, on the AQI 100 line in what counts as a bad air day.