San Antonio Air Quality in 2019
In 2019, San Antonio's air quality (San Antonio-New Braunfels, TX area) had a median daily AQI of 55 (Moderate) across 365 monitored days. 5 days (1.4%) reached Unhealthy for Sensitive Groups or worse, 117 were Good, and the year's peak AQI was 175 (Unhealthy). Fine particulate matter (PM2.5) set the daily AQI on 271 of those days. The cleanest month of 2019 was October (median AQI 48, 0 days above 100) and the worst was June (median 61, 2 days above 100, peak 126).
- Good: 32.1%
- Moderate: 66.6%
- Unhealthy for Sensitive Groups: 1.1%
- Unhealthy or worse: 0.3%
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How was San Antonio's air quality in 2019?
Moderate on a typical day: median AQI 55, with 5 days above AQI 100 out of 365 monitored — the 1st cleanest of 7 years on record for the area.
- ✓Peak AQI in 2019: 175 (Unhealthy).
- ✓Fine particulate matter (PM2.5) was the main pollutant on 271 days.
- ✓Cleanest month: October; worst: June.
Frequently asked questions
What was the average AQI in San Antonio in 2019?▾
EPA's Air Quality System puts San Antonio's (San Antonio-New Braunfels, TX) median daily AQI for 2019 at 55, which is Moderate. 5 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 175.
Which month had the worst air quality in San Antonio in 2019?▾
The cleanest month of 2019 was October (median AQI 48, 0 days above 100) and the worst was June (median 61, 2 days above 100, peak 126).
Was 2019 a good or bad year for San Antonio's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2019 ranks 1st cleanest by days above AQI 100 — the best year on record here. 2019's median of 55 is in line with the area's typical annual median of 55.
San Antonio month by month in 2019
San Antonio air quality month by month, 2019 (San Antonio-New Braunfels, TX, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 48 | 1 | 175 | PM2.5 |
| February | 28 | 55 | 0 | 80 | PM2.5 |
| March | 31 | 54 | 0 | 78 | PM2.5 |
| April | 30 | 58 | 0 | 100 | O3 |
| May | 31 | 59 | 0 | 97 | PM2.5 |
| Juneworst | 30 | 61 | 2 | 126 | PM2.5 |
| July | 31 | 59 | 2 | 119 | PM2.5 |
| August | 31 | 57 | 0 | 80 | PM2.5 |
| September | 30 | 52 | 0 | 74 | PM2.5 |
| Octobercleanest | 31 | 48 | 0 | 74 | PM2.5 |
| November | 30 | 54 | 0 | 76 | PM2.5 |
| December | 31 | 54 | 0 | 85 | PM2.5 |
How 2019 compares
Among the 7 years EPA has published for the area (2019–2025), 2019 ranks 1st cleanest by days above AQI 100 — the best year on record here.
2019's median of 55 is in line with 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 33 (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.