Burlington Air Quality in Spring
Across 2019–2025, Burlington's spring (March–May) air quality had a median AQI of 43 (Good) over 644 monitored days in the Burlington-South Burlington, VT area. 0.3% of spring days (2 of 644) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 81.5% of days. The cleanest spring on record here was 2024 (median AQI 38, 0 days above 100) and the worst was 2023 (median 45, 1 day above 100, peak AQI 101).
- Good: 86.6%
- Moderate: 13.0%
- Unhealthy for Sensitive Groups: 0.3%
- Unhealthy or worse: 0.0%
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How is the air in Burlington in spring?
Good on a typical day: median AQI 43 across 2019–2025, with 0.3% of spring days above AQI 100. Ground-level ozone is the main driver.
- ✓86.6% of spring days were Good (AQI 0–50), 13.0% Moderate (51–100).
- ✓2 days of 644 reached AQI 101+; the spring peak was 108.
- ✓Cleanest month: May; worst month: March.
Frequently asked questions
What is the air quality like in Burlington in spring?▾
Across 2019–2025, the median daily AQI in Burlington in spring was 43 (Good). 86.6% of days were Good, 13.0% Moderate, and 0.3% reached Unhealthy for Sensitive Groups or worse, based on 644 monitored days in EPA's Air Quality System.
Is spring a good time for outdoor exercise in Burlington?▾
A typical spring day in Burlington sits in the Good range (median AQI 43), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of spring days reached AQI 101+ in 2019–2025.
Which pollutant causes Burlington's spring air quality problems?▾
Ground-level ozone set the daily AQI on 81.5% of spring days in Burlington. The highest spring AQI recorded in 2019–2025 was 108 (Unhealthy for Sensitive Groups), in 2023.
Burlington spring air quality, year by year
Burlington spring 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 | 92 | 44 | 0 | 64 | O3 |
| 2020 | 92 | 43 | 0 | 65 | O3 |
| 2021 | 92 | 41 | 0 | 84 | O3 |
| 2022 | 92 | 44 | 0 | 77 | O3 |
| 2023worst | 92 | 45 | 1 | 101 | O3 |
| 2024cleanest | 92 | 38 | 0 | 64 | O3 |
| 2025 | 92 | 41 | 1 | 108 | O3 |
What spring air means in Burlington
A typical spring day in Burlington sits in the Good range (median AQI 43), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of spring days reached AQI 101+ in 2019–2025.
Spring's median AQI of 43 is above Burlington's whole-year median of 39, making it one of the area's dirtier periods. Nationally, the median Spring AQI across every EPA metro area (307,196 metro-days, 2019–2025) is 43, so Burlington runs in line with the national Spring norm; 0.3% of its Spring days topped AQI 100 versus 0.8% nationally (about the same).
Within the season, May is the cleanest month (median AQI 40, 0.0% of days above 100) and March the worst (median 44, 0.5% 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.