San Antonio Air Quality in October
Across 2019–2025, San Antonio's October air quality had a median AQI of 50 (Good) over 217 monitored days in the San Antonio-New Braunfels, TX area. 7.8% of October days (17 of 217) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 59.9% of days. The cleanest October on record here was 2023 (median AQI 41, 0 days above 100) and the worst was 2020 (median 58, 4 days above 100, peak AQI 122).
- Good: 52.5%
- Moderate: 39.6%
- Unhealthy for Sensitive Groups: 7.8%
- Unhealthy or worse: 0.0%
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 is the air in San Antonio in October?
Good on a typical day: median AQI 50 across 2019–2025, with 7.8% of October days above AQI 100. Ground-level ozone is the main driver.
- ✓52.5% of October days were Good (AQI 0–50), 39.6% Moderate (51–100).
- ✓17 days of 217 reached AQI 101+; the October peak was 150.
- ✓Best October: 2023; worst October: 2020.
Frequently asked questions
What is the air quality like in San Antonio in October?▾
Across 2019–2025, the median daily AQI in San Antonio in October was 50 (Good). 52.5% of days were Good, 39.6% Moderate, and 7.8% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is October a good time for outdoor exercise in San Antonio?▾
A typical October day in San Antonio sits in the Good range (median AQI 50), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 13 of October days (7.8%) reached AQI 101+ in 2019–2025.
Which pollutant causes San Antonio's October air quality problems?▾
Ground-level ozone set the daily AQI on 59.9% of October days in San Antonio. The highest October AQI recorded in 2019–2025 was 150 (Unhealthy for Sensitive Groups), in 2020.
San Antonio October air quality, year by year
San Antonio October air quality by year (San Antonio-New Braunfels, TX, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 31 | 48 | 0 | 74 | PM2.5 |
| 2020worst | 31 | 58 | 4 | 122 | PM2.5 |
| 2021 | 31 | 53 | 3 | 147 | PM2.5 |
| 2022 | 31 | 52 | 3 | 122 | O3 |
| 2023cleanest | 31 | 41 | 0 | 67 | O3 |
| 2024 | 31 | 49 | 4 | 150 | O3 |
| 2025 | 31 | 49 | 3 | 140 | O3 |
What October air means in San Antonio
A typical October day in San Antonio sits in the Good range (median AQI 50), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 13 of October days (7.8%) reached AQI 101+ in 2019–2025.
October's median AQI of 50 is below San Antonio's whole-year median of 55, making it one of the area's cleaner periods. Nationally, the median October AQI across every EPA metro area (102,872 metro-days, 2019–2025) is 38, so San Antonio runs above the national October norm; 7.8% of its October days topped AQI 100 versus 1.3% nationally (above average).
October is part of San Antonio's fall season (September, October, November); the fall page pools all three months.
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 month 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.