Burlington Air Quality in April
Across 2019–2025, Burlington's April air quality had a median AQI of 43 (Good) over 210 monitored days in the Burlington-South Burlington, VT area. 0.5% of April days (1 of 210) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 88.6% of days. The cleanest April on record here was 2024 (median AQI 41, 0 days above 100) and the worst was 2023 (median 46, 1 day above 100, peak AQI 101).
- Good: 91.9%
- Moderate: 7.6%
- Unhealthy for Sensitive Groups: 0.5%
- Unhealthy or worse: 0.0%
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How is the air in Burlington in April?
Good on a typical day: median AQI 43 across 2019–2025, with 0.5% of April days above AQI 100. Ground-level ozone is the main driver.
- ✓91.9% of April days were Good (AQI 0–50), 7.6% Moderate (51–100).
- ✓1 day of 210 reached AQI 101+; the April peak was 101.
- ✓Best April: 2024; worst April: 2023.
Frequently asked questions
What is the air quality like in Burlington in April?▾
Across 2019–2025, the median daily AQI in Burlington in April was 43 (Good). 91.9% of days were Good, 7.6% Moderate, and 0.5% reached Unhealthy for Sensitive Groups or worse, based on 210 monitored days in EPA's Air Quality System.
Is April a good time for outdoor exercise in Burlington?▾
A typical April 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 April days reached AQI 101+ in 2019–2025.
Which pollutant causes Burlington's April air quality problems?▾
Ground-level ozone set the daily AQI on 88.6% of April days in Burlington. The highest April AQI recorded in 2019–2025 was 101 (Unhealthy for Sensitive Groups), in 2023.
Burlington April air quality, year by year
Burlington April 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 | 30 | 44 | 0 | 57 | O3 |
| 2020 | 30 | 42 | 0 | 50 | O3 |
| 2021 | 30 | 42 | 0 | 62 | O3 |
| 2022 | 30 | 44 | 0 | 49 | O3 |
| 2023worst | 30 | 46 | 1 | 101 | O3 |
| 2024cleanest | 30 | 41 | 0 | 61 | O3 |
| 2025 | 30 | 44 | 0 | 58 | O3 |
What April air means in Burlington
A typical April 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 April days reached AQI 101+ in 2019–2025.
April'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 April AQI across every EPA metro area (100,677 metro-days, 2019–2025) is 44, so Burlington runs in line with the national April norm; 0.5% of its April days topped AQI 100 versus 0.7% nationally (about the same).
April 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.