Hartford Air Quality in 2023
In 2023, Hartford's air quality (Hartford-West Hartford-East Hartford, CT area) had a median daily AQI of 44 (Good) across 365 monitored days. 9 days (2.5%) reached Unhealthy for Sensitive Groups or worse, 223 were Good, and the year's peak AQI was 166 (Unhealthy). Ground-level ozone set the daily AQI on 178 of those days. The cleanest month of 2023 was January (median AQI 33, 0 days above 100) and the worst was June (median 51, 5 days above 100, peak 166).
- Good: 61.1%
- Moderate: 36.4%
- Unhealthy for Sensitive Groups: 1.4%
- Unhealthy or worse: 1.1%
Improve Indoor Air Quality
Even with good outdoor air in Hartford, indoor PM2.5, dust and allergens build up. A True-HEPA purifier keeps a bedroom or office consistently clean.
Recommended: Levoit Core 400S — True HEPA · CADR ~141 CFM · rooms up to 219 sq ft
As an Amazon Associate, we earn from qualifying purchases.
How was Hartford's air quality in 2023?
Good on a typical day: median AQI 44, with 9 days above AQI 100 out of 365 monitored — the 5th cleanest of 7 years on record for the area.
- ✓Peak AQI in 2023: 166 (Unhealthy).
- ✓Ground-level ozone was the main pollutant on 178 days.
- ✓Cleanest month: January; worst: June.
Frequently asked questions
What was the average AQI in Hartford in 2023?▾
EPA's Air Quality System puts Hartford's (Hartford-West Hartford-East Hartford, CT) median daily AQI for 2023 at 44, which is Good. 9 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 166.
Which month had the worst air quality in Hartford in 2023?▾
The cleanest month of 2023 was January (median AQI 33, 0 days above 100) and the worst was June (median 51, 5 days above 100, peak 166).
Was 2023 a good or bad year for Hartford's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2023 ranks 5th cleanest by days above AQI 100. 2023's median of 44 is in line with the area's typical annual median of 43.
Hartford month by month in 2023
Hartford air quality month by month, 2023 (Hartford-West Hartford-East Hartford, CT, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| Januarycleanest | 31 | 33 | 0 | 62 | PM2.5 |
| February | 28 | 47 | 0 | 67 | PM2.5 |
| March | 31 | 44 | 0 | 63 | O3 |
| April | 30 | 48 | 2 | 156 | O3 |
| May | 31 | 46 | 0 | 100 | O3 |
| Juneworst | 30 | 51 | 5 | 166 | O3 |
| July | 31 | 58 | 2 | 140 | O3 |
| August | 31 | 44 | 0 | 65 | PM2.5 |
| September | 30 | 44 | 0 | 98 | PM2.5 |
| October | 31 | 35 | 0 | 76 | PM2.5 |
| November | 30 | 36 | 0 | 61 | PM2.5 |
| December | 31 | 38 | 0 | 79 | PM2.5 |
How 2023 compares
Among the 7 years EPA has published for the area (2019–2025), 2023 ranks 5th cleanest by days above AQI 100.
2023's median of 44 is in line with 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 19 (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.