Burlington Air Quality in 2025
In 2025, Burlington's air quality (Burlington-South Burlington, VT area) had a median daily AQI of 38 (Good) across 365 monitored days. 4 days (1.1%) reached Unhealthy for Sensitive Groups or worse, 320 were Good, and the year's peak AQI was 156 (Unhealthy). Ground-level ozone set the daily AQI on 293 of those days. The cleanest month of 2025 was September (median AQI 31, 0 days above 100) and the worst was June (median 42, 1 day above 100, peak 106).
- Good: 87.7%
- Moderate: 11.2%
- Unhealthy for Sensitive Groups: 0.8%
- Unhealthy or worse: 0.3%
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How was Burlington's air quality in 2025?
Good on a typical day: median AQI 38, with 4 days above AQI 100 out of 365 monitored — the 6th cleanest of 7 years on record for the area.
- ✓Peak AQI in 2025: 156 (Unhealthy).
- ✓Ground-level ozone was the main pollutant on 293 days.
- ✓Cleanest month: September; worst: June.
Frequently asked questions
What was the average AQI in Burlington in 2025?▾
EPA's Air Quality System puts Burlington's (Burlington-South Burlington, VT) median daily AQI for 2025 at 38, which is Good. 4 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 156.
Which month had the worst air quality in Burlington in 2025?▾
The cleanest month of 2025 was September (median AQI 31, 0 days above 100) and the worst was June (median 42, 1 day above 100, peak 106).
Was 2025 a good or bad year for Burlington's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2025 ranks 6th cleanest by days above AQI 100. 2025's median of 38 is in line with the area's typical annual median of 39.
Burlington month by month in 2025
Burlington air quality month by month, 2025 (Burlington-South Burlington, VT, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 37 | 0 | 43 | O3 |
| February | 28 | 40 | 0 | 49 | O3 |
| March | 31 | 43 | 1 | 108 | O3 |
| April | 30 | 44 | 0 | 58 | O3 |
| May | 31 | 35 | 0 | 51 | O3 |
| Juneworst | 30 | 42 | 1 | 106 | O3 |
| July | 31 | 43 | 1 | 156 | PM2.5 |
| August | 31 | 42 | 1 | 129 | O3 |
| Septembercleanest | 30 | 31 | 0 | 58 | O3 |
| October | 31 | 32 | 0 | 80 | O3 |
| November | 30 | 31 | 0 | 42 | O3 |
| December | 31 | 31 | 0 | 44 | PM2.5 |
How 2025 compares
Among the 7 years EPA has published for the area (2019–2025), 2025 ranks 6th cleanest by days above AQI 100.
2025's median of 38 is in line with the area's typical annual median of 39.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Burlington
The latest EPA AirNow observation puts Burlington's AQI at 27 (PM2.5). The figures above are multi-year annual statistics, not today's reading.
View current Burlington air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Burlington-South Burlington, VT), 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.