Bad Air Days in Atascosa County, Texas: 2 a Year
2 bad air days a year
Fewer bad air days than most monitored US counties. Ranked 497 of 996 monitored counties, where 1 is worst.
What makes them bad: mostly particles: smoke and dust (100% particle days).
When the bad days come in Atascosa
- J
- F
- M
- A
- M
- J
- J
- A
- S
- O
- N
- D
Most bad days here fall in May and June. Averaged over 2016 to 2025.
Is a purifier worth it here?
- Bad air days are rare here. A standard furnace filter is enough; no purifier needed for outdoor air.
- On the odd bad day, check AirNow and keep windows shut.
Better or worse than it was
The worst recent year was 2024, with 8 bad days on 347 monitored days.
| Date | AQI | Main pollutant |
|---|---|---|
| 2020-06-27 | 158 | PM2.5 |
| 2024-05-08 | 116 | PM2.5 |
| 2022-06-16 | 115 | PM2.5 |
| 2024-05-24 | 111 | PM2.5 |
| 2024-07-31 | 108 | PM2.5 |
Most days, not the worst ones
Across 1,944 monitored days from 2020 to 2025, the air in Atascosa County rated Good on 64% of them, less often than the 72% typical of monitored counties, and Moderate on 35%. The median day sat at AQI 41; one day in ten went above 64.
The pollutant setting the AQI on an ordinary day here:
- fine particles (PM2.5)100%1,944 days
Year by year
| Year | Days monitored | Good | Moderate | Over 100 | Over 150 | Median AQI | Highest AQI |
|---|---|---|---|---|---|---|---|
| 2025* | 341 | 259 | 82 | 0 | 0 | 35 | 92 |
| 2024 | 347 | 198 | 141 | 8 | 0 | 44 | 116 |
| 2023 | 330 | 210 | 120 | 0 | 0 | 42 | 86 |
| 2022 | 356 | 218 | 136 | 2 | 0 | 44 | 115 |
| 2021 | 356 | 213 | 143 | 0 | 0 | 43 | 87 |
| 2020 | 214 | 149 | 64 | 1 | 1 | 38 | 158 |
*2025 may be a partial year in EPA's file.
Texas compared
- Harris County29/yr
- El Paso County26/yr
- Tarrant County19/yr
- Denton County17/yr
- Dallas County12/yr
- Collin County11/yr
- Bexar County11/yr
- Cameron County9/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.