Burlington Air Quality in March
Across 2019–2025, Burlington's March air quality had a median AQI of 44 (Good) over 217 monitored days in the Burlington-South Burlington, VT area. 0.5% of March days (1 of 217) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 72.4% of days. The cleanest March on record here was 2024 (median AQI 37, 0 days above 100) and the worst was 2025 (median 43, 1 day above 100, peak AQI 108).
- Good: 80.6%
- Moderate: 18.9%
- Unhealthy for Sensitive Groups: 0.5%
- Unhealthy or worse: 0.0%
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How is the air in Burlington in March?
Good on a typical day: median AQI 44 across 2019–2025, with 0.5% of March days above AQI 100. Ground-level ozone is the main driver.
- ✓80.6% of March days were Good (AQI 0–50), 18.9% Moderate (51–100).
- ✓1 day of 217 reached AQI 101+; the March peak was 108.
- ✓Best March: 2024; worst March: 2025.
Frequently asked questions
What is the air quality like in Burlington in March?▾
Across 2019–2025, the median daily AQI in Burlington in March was 44 (Good). 80.6% of days were Good, 18.9% Moderate, and 0.5% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is March a good time for outdoor exercise in Burlington?▾
A typical March day in Burlington sits in the Good range (median AQI 44), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of March days reached AQI 101+ in 2019–2025.
Which pollutant causes Burlington's March air quality problems?▾
Ground-level ozone set the daily AQI on 72.4% of March days in Burlington. The highest March AQI recorded in 2019–2025 was 108 (Unhealthy for Sensitive Groups), in 2025.
Burlington March air quality, year by year
Burlington March 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 | 48 | 0 | 64 | O3 |
| 2020 | 31 | 43 | 0 | 65 | O3 |
| 2021 | 31 | 42 | 0 | 71 | O3 |
| 2022 | 31 | 44 | 0 | 77 | O3 |
| 2023 | 31 | 44 | 0 | 59 | O3 |
| 2024cleanest | 31 | 37 | 0 | 45 | O3 |
| 2025worst | 31 | 43 | 1 | 108 | O3 |
What March air means in Burlington
A typical March day in Burlington sits in the Good range (median AQI 44), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of March days reached AQI 101+ in 2019–2025.
March's median AQI of 44 is above Burlington's whole-year median of 39, making it one of the area's dirtier periods. Nationally, the median March AQI across every EPA metro area (102,455 metro-days, 2019–2025) is 42, so Burlington runs in line with the national March norm; 0.5% of its March days topped AQI 100 versus 0.4% nationally (about the same).
March 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.