Burlington Air Quality in 2023
In 2023, Burlington's air quality (Burlington-South Burlington, VT area) had a median daily AQI of 42 (Good) across 365 monitored days. 6 days (1.6%) reached Unhealthy for Sensitive Groups or worse, 259 were Good, and the year's peak AQI was 160 (Unhealthy). Ground-level ozone set the daily AQI on 192 of those days. The cleanest month of 2023 was October (median AQI 33, 0 days above 100) and the worst was June (median 45, 3 days above 100, peak 160).
- Good: 71.0%
- Moderate: 27.4%
- Unhealthy for Sensitive Groups: 1.1%
- Unhealthy or worse: 0.5%
Reduce Indoor Ozone in Burlington
Today's main pollutant in Burlington is ground-level ozone (AQI 24). Important: standard HEPA filters do NOT remove ozone — only a purifier with a substantial activated-carbon bed adsorbs it. The biggest wins are cutting indoor sources (gas appliances, certain "ionizer" purifiers) and ventilating when outdoor ozone is low (early morning). A high-carbon unit helps with the gases and VOCs that linger indoors.
Recommended: Levoit Core 300 — True HEPA + activated carbon · CADR ~141 CFM · rooms up to 219 sq ft
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How was Burlington's air quality in 2023?
Good on a typical day: median AQI 42, with 6 days above AQI 100 out of 365 monitored — the 7th cleanest of 7 years on record for the area.
- ✓Peak AQI in 2023: 160 (Unhealthy).
- ✓Ground-level ozone was the main pollutant on 192 days.
- ✓Cleanest month: October; worst: June.
Frequently asked questions
What was the average AQI in Burlington in 2023?▾
EPA's Air Quality System puts Burlington's (Burlington-South Burlington, VT) median daily AQI for 2023 at 42, which is Good. 6 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 160.
Which month had the worst air quality in Burlington in 2023?▾
The cleanest month of 2023 was October (median AQI 33, 0 days above 100) and the worst was June (median 45, 3 days above 100, peak 160).
Was 2023 a good or bad year for Burlington's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2023 ranks 7th cleanest by days above AQI 100 — the worst year on record here. 2023's median of 42 is above the area's typical annual median of 39.
Burlington month by month in 2023
Burlington air quality month by month, 2023 (Burlington-South Burlington, VT, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 37 | 0 | 56 | PM2.5 |
| February | 28 | 43 | 0 | 57 | PM2.5 |
| March | 31 | 44 | 0 | 59 | O3 |
| April | 30 | 46 | 1 | 101 | O3 |
| May | 31 | 43 | 0 | 80 | O3 |
| Juneworst | 30 | 45 | 3 | 160 | PM2.5 |
| July | 31 | 50 | 2 | 152 | PM2.5 |
| August | 31 | 38 | 0 | 71 | PM2.5 |
| September | 30 | 39 | 0 | 82 | PM2.5 |
| Octobercleanest | 31 | 33 | 0 | 72 | O3 |
| November | 30 | 34 | 0 | 60 | O3 |
| December | 31 | 43 | 0 | 66 | PM2.5 |
How 2023 compares
Among the 7 years EPA has published for the area (2019–2025), 2023 ranks 7th cleanest by days above AQI 100 — the worst year on record here.
2023's median of 42 is above the area's typical annual median of 39.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Burlington
The latest EPA AirNow observation puts Burlington's AQI at 24 (O3). The figures above are multi-year annual 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.