Burlington Air Quality in Fall
Across 2019–2025, Burlington's fall (September–November) air quality had a median AQI of 33 (Good) over 637 monitored days in the Burlington-South Burlington, VT area. 0.0% of fall days (0 of 637) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 65.9% of days. The cleanest fall on record here was 2025 (median AQI 31, 0 days above 100) and the worst was 2022 (median 35, 0 days above 100, peak AQI 61).
- Good: 88.9%
- Moderate: 11.1%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
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How is the air in Burlington in fall?
Good on a typical day: median AQI 33 across 2019–2025, with 0.0% of fall days above AQI 100. Ground-level ozone is the main driver.
- ✓88.9% of fall days were Good (AQI 0–50), 11.1% Moderate (51–100).
- ✓0 days of 637 reached AQI 101+; the fall peak was 84.
- ✓Cleanest month: September; worst month: November.
Frequently asked questions
What is the air quality like in Burlington in fall?▾
Across 2019–2025, the median daily AQI in Burlington in fall was 33 (Good). 88.9% of days were Good, 11.1% Moderate, and 0.0% reached Unhealthy for Sensitive Groups or worse, based on 637 monitored days in EPA's Air Quality System.
Is fall a good time for outdoor exercise in Burlington?▾
A typical fall day in Burlington sits in the Good range (median AQI 33), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of fall days reached AQI 101+ in 2019–2025.
Which pollutant causes Burlington's fall air quality problems?▾
Ground-level ozone set the daily AQI on 65.9% of fall days in Burlington. The highest fall AQI recorded in 2019–2025 was 84 (Moderate), in 2022.
Burlington fall air quality, year by year
Burlington fall air quality by year (Burlington-South Burlington, VT, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 91 | 32 | 0 | 72 | O3 |
| 2020 | 91 | 32 | 0 | 70 | O3 |
| 2021 | 91 | 33 | 0 | 67 | PM2.5 |
| 2022worst | 91 | 35 | 0 | 61 | O3 |
| 2023 | 91 | 34 | 0 | 82 | O3 |
| 2024 | 91 | 32 | 0 | 84 | O3 |
| 2025cleanest | 91 | 31 | 0 | 80 | O3 |
What fall air means in Burlington
A typical fall day in Burlington sits in the Good range (median AQI 33), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of fall days reached AQI 101+ in 2019–2025.
Fall's median AQI of 33 is below Burlington's whole-year median of 39, making it one of the area's cleaner periods. Nationally, the median Fall AQI across every EPA metro area (296,275 metro-days, 2019–2025) is 40, so Burlington runs below the national Fall norm; 0.0% of its Fall days topped AQI 100 versus 1.5% nationally (below average).
Within the season, September is the cleanest month (median AQI 33, 0.0% of days above 100) and November the worst (median 34, 0.0% above 100).
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 season 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.