Houston Air Quality in 2025
In 2025, Houston's air quality (Houston-The Woodlands-Sugar Land, TX area) had a median daily AQI of 63 (Moderate) across 365 monitored days. 46 days (12.6%) reached Unhealthy for Sensitive Groups or worse, 37 were Good, and the year's peak AQI was 179 (Unhealthy). Fine particulate matter (PM2.5) set the daily AQI on 228 of those days. The cleanest month of 2025 was November (median AQI 54, 0 days above 100) and the worst was September (median 100, 13 days above 100, peak 154).
- Good: 10.1%
- Moderate: 77.3%
- Unhealthy for Sensitive Groups: 9.6%
- Unhealthy or worse: 3.0%
Extra Protection for Houston Homes
Air quality in Houston is moderate (AQI 57), 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 Houston's air quality in 2025?
Moderate on a typical day: median AQI 63, with 46 days above AQI 100 out of 365 monitored — the 5th cleanest of 7 years on record for the area.
- ✓Peak AQI in 2025: 179 (Unhealthy).
- ✓Fine particulate matter (PM2.5) was the main pollutant on 228 days.
- ✓Cleanest month: November; worst: September.
Frequently asked questions
What was the average AQI in Houston in 2025?▾
EPA's Air Quality System puts Houston's (Houston-The Woodlands-Sugar Land, TX) median daily AQI for 2025 at 63, which is Moderate. 46 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 179.
Which month had the worst air quality in Houston in 2025?▾
The cleanest month of 2025 was November (median AQI 54, 0 days above 100) and the worst was September (median 100, 13 days above 100, peak 154).
Was 2025 a good or bad year for Houston's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2025 ranks 5th cleanest by days above AQI 100. 2025's median of 63 is in line with the area's typical annual median of 61.
Houston month by month in 2025
Houston air quality month by month, 2025 (Houston-The Woodlands-Sugar Land, TX, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 58 | 1 | 168 | PM2.5 |
| February | 28 | 58 | 1 | 140 | PM2.5 |
| March | 31 | 69 | 3 | 179 | PM2.5 |
| April | 30 | 63 | 4 | 133 | PM2.5 |
| May | 31 | 64 | 3 | 140 | PM2.5 |
| June | 30 | 61 | 2 | 126 | PM2.5 |
| July | 31 | 66 | 3 | 172 | PM2.5 |
| August | 31 | 80 | 9 | 161 | O3 |
| Septemberworst | 30 | 100 | 13 | 154 | O3 |
| October | 31 | 64 | 7 | 151 | O3 |
| Novembercleanest | 30 | 54 | 0 | 77 | PM2.5 |
| December | 31 | 61 | 0 | 100 | PM2.5 |
How 2025 compares
Among the 7 years EPA has published for the area (2019–2025), 2025 ranks 5th cleanest by days above AQI 100.
2025's median of 63 is in line with the area's typical annual median of 61.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Houston
The latest EPA AirNow observation puts Houston's AQI at 57 (PM2.5). The figures above are multi-year annual statistics, not today's reading.
View current Houston air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Houston-The Woodlands-Sugar Land, 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.