San Antonio Air Quality in 2025
In 2025, San Antonio's air quality (San Antonio-New Braunfels, TX area) had a median daily AQI of 52 (Moderate) across 365 monitored days. 11 days (3.0%) reached Unhealthy for Sensitive Groups or worse, 155 were Good, and the year's peak AQI was 154 (Unhealthy). Fine particulate matter (PM2.5) set the daily AQI on 208 of those days. The cleanest month of 2025 was November (median AQI 41, 0 days above 100) and the worst was September (median 60, 3 days above 100, peak 154).
- Good: 42.5%
- Moderate: 54.5%
- Unhealthy for Sensitive Groups: 2.7%
- Unhealthy or worse: 0.3%
Extra Protection for San Antonio Homes
Air quality in San Antonio is moderate (AQI 52), with fine particles (PM2.5) the main concern. A True-HEPA purifier gives sensitive groups — kids, seniors and anyone with asthma or allergies — cleaner air indoors on days like today.
Recommended: Coway AP-1512HH Mighty — True HEPA + carbon · CADR ~246 CFM · rooms up to 361 sq ft
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How was San Antonio's air quality in 2025?
Moderate on a typical day: median AQI 52, with 11 days above AQI 100 out of 365 monitored — the 3rd cleanest of 7 years on record for the area.
- ✓Peak AQI in 2025: 154 (Unhealthy).
- ✓Fine particulate matter (PM2.5) was the main pollutant on 208 days.
- ✓Cleanest month: November; worst: September.
Frequently asked questions
What was the average AQI in San Antonio in 2025?▾
EPA's Air Quality System puts San Antonio's (San Antonio-New Braunfels, TX) median daily AQI for 2025 at 52, which is Moderate. 11 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 154.
Which month had the worst air quality in San Antonio in 2025?▾
The cleanest month of 2025 was November (median AQI 41, 0 days above 100) and the worst was September (median 60, 3 days above 100, peak 154).
Was 2025 a good or bad year for San Antonio's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2025 ranks 3rd cleanest by days above AQI 100. 2025's median of 52 is below the area's typical annual median of 55.
San Antonio month by month in 2025
San Antonio air quality month by month, 2025 (San Antonio-New Braunfels, TX, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 44 | 0 | 64 | PM2.5 |
| February | 28 | 49 | 0 | 63 | PM2.5 |
| March | 31 | 57 | 0 | 97 | PM2.5 |
| April | 30 | 64 | 1 | 115 | PM2.5 |
| May | 31 | 67 | 3 | 108 | O3 |
| June | 30 | 57 | 0 | 68 | PM2.5 |
| July | 31 | 54 | 0 | 97 | PM2.5 |
| August | 31 | 51 | 1 | 122 | O3 |
| Septemberworst | 30 | 60 | 3 | 154 | O3 |
| October | 31 | 49 | 3 | 140 | O3 |
| Novembercleanest | 30 | 41 | 0 | 97 | O3 |
| December | 31 | 47 | 0 | 86 | PM2.5 |
How 2025 compares
Among the 7 years EPA has published for the area (2019–2025), 2025 ranks 3rd cleanest by days above AQI 100.
2025's median of 52 is below the area's typical annual median of 55.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in San Antonio
The latest EPA AirNow observation puts San Antonio's AQI at 52 (PM2.5). The figures above are multi-year annual statistics, not today's reading.
View current San Antonio air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (San Antonio-New Braunfels, TX), 2019–2025. Daily AQI per CBSA is the highest AQI reported by any monitor in the area that day; the defining parameter is the pollutant that set it. Month and season statistics pool every such day in the period across all years listed. Retrieved 2026-09-09.