Burlington Air Quality in May
Across 2019–2025, Burlington's May air quality had a median AQI of 40 (Good) over 217 monitored days in the Burlington-South Burlington, VT area. 0.0% of May days (0 of 217) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 83.9% of days. The cleanest May on record here was 2025 (median AQI 35, 0 days above 100) and the worst was 2023 (median 43, 0 days above 100, peak AQI 80).
- Good: 87.6%
- Moderate: 12.4%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
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How is the air in Burlington in May?
Good on a typical day: median AQI 40 across 2019–2025, with 0.0% of May days above AQI 100. Ground-level ozone is the main driver.
- ✓87.6% of May days were Good (AQI 0–50), 12.4% Moderate (51–100).
- ✓0 days of 217 reached AQI 101+; the May peak was 84.
- ✓Best May: 2025; worst May: 2023.
Frequently asked questions
What is the air quality like in Burlington in May?▾
Across 2019–2025, the median daily AQI in Burlington in May was 40 (Good). 87.6% of days were Good, 12.4% Moderate, and 0.0% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is May a good time for outdoor exercise in Burlington?▾
A typical May day in Burlington sits in the Good range (median AQI 40), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of May days reached AQI 101+ in 2019–2025.
Which pollutant causes Burlington's May air quality problems?▾
Ground-level ozone set the daily AQI on 83.9% of May days in Burlington. The highest May AQI recorded in 2019–2025 was 84 (Moderate), in 2023.
Burlington May air quality, year by year
Burlington May 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 | 31 | 38 | 0 | 46 | O3 |
| 2020 | 31 | 43 | 0 | 61 | O3 |
| 2021 | 31 | 41 | 0 | 84 | O3 |
| 2022 | 31 | 42 | 0 | 58 | O3 |
| 2023worst | 31 | 43 | 0 | 80 | O3 |
| 2024 | 31 | 39 | 0 | 64 | O3 |
| 2025cleanest | 31 | 35 | 0 | 51 | O3 |
What May air means in Burlington
A typical May day in Burlington sits in the Good range (median AQI 40), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of May days reached AQI 101+ in 2019–2025.
May's median AQI of 40 is in line with Burlington's whole-year median of 39, so this period is neither a clean nor a dirty stretch for the area. Nationally, the median May AQI across every EPA metro area (104,064 metro-days, 2019–2025) is 44, so Burlington runs below the national May norm; 0.0% of its May days topped AQI 100 versus 1.3% nationally (below average).
May is part of Burlington's spring season (March, April, May); the spring page pools all three months.
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 month 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.