Hartford Air Quality in 2024
In 2024, Hartford's air quality (Hartford-West Hartford-East Hartford, CT area) had a median daily AQI of 40 (Good) across 366 monitored days. 9 days (2.5%) reached Unhealthy for Sensitive Groups or worse, 276 were Good, and the year's peak AQI was 185 (Unhealthy). Ground-level ozone set the daily AQI on 228 of those days. The cleanest month of 2024 was November (median AQI 32, 0 days above 100) and the worst was June (median 51, 6 days above 100, peak 185).
- Good: 75.4%
- Moderate: 22.1%
- Unhealthy for Sensitive Groups: 2.2%
- Unhealthy or worse: 0.3%
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How was Hartford's air quality in 2024?
Good on a typical day: median AQI 40, with 9 days above AQI 100 out of 366 monitored — the 4th cleanest of 7 years on record for the area.
- ✓Peak AQI in 2024: 185 (Unhealthy).
- ✓Ground-level ozone was the main pollutant on 228 days.
- ✓Cleanest month: November; worst: June.
Frequently asked questions
What was the average AQI in Hartford in 2024?▾
EPA's Air Quality System puts Hartford's (Hartford-West Hartford-East Hartford, CT) median daily AQI for 2024 at 40, which is Good. 9 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 185.
Which month had the worst air quality in Hartford in 2024?▾
The cleanest month of 2024 was November (median AQI 32, 0 days above 100) and the worst was June (median 51, 6 days above 100, peak 185).
Was 2024 a good or bad year for Hartford's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2024 ranks 4th cleanest by days above AQI 100. 2024's median of 40 is below the area's typical annual median of 43.
Hartford month by month in 2024
Hartford air quality month by month, 2024 (Hartford-West Hartford-East Hartford, CT, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 35 | 0 | 67 | PM2.5 |
| February | 29 | 39 | 0 | 63 | PM2.5 |
| March | 31 | 40 | 0 | 54 | O3 |
| April | 30 | 43 | 0 | 64 | O3 |
| May | 31 | 40 | 1 | 119 | O3 |
| Juneworst | 30 | 51 | 6 | 185 | O3 |
| July | 31 | 52 | 2 | 115 | O3 |
| August | 31 | 46 | 0 | 81 | O3 |
| September | 30 | 34 | 0 | 93 | O3 |
| October | 31 | 33 | 0 | 74 | O3 |
| Novembercleanest | 30 | 32 | 0 | 41 | O3 |
| December | 31 | 36 | 0 | 75 | PM2.5 |
How 2024 compares
Among the 7 years EPA has published for the area (2019–2025), 2024 ranks 4th cleanest by days above AQI 100.
2024's median of 40 is below the area's typical annual median of 43.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Hartford
The latest EPA AirNow observation puts Hartford's AQI at 36 (PM2.5). The figures above are multi-year annual statistics, not today's reading.
View current Hartford air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Hartford-West Hartford-East Hartford, CT), 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.