Hartford Air Quality in 2019
In 2019, Hartford's air quality (Hartford-West Hartford-East Hartford, CT area) had a median daily AQI of 44 (Good) across 365 monitored days. 8 days (2.2%) reached Unhealthy for Sensitive Groups or worse, 248 were Good, and the year's peak AQI was 154 (Unhealthy). Ground-level ozone set the daily AQI on 188 of those days. The cleanest month of 2019 was October (median AQI 32, 0 days above 100) and the worst was July (median 57, 5 days above 100, peak 154).
- Good: 67.9%
- Moderate: 29.9%
- Unhealthy for Sensitive Groups: 1.9%
- Unhealthy or worse: 0.3%
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How was Hartford's air quality in 2019?
Good on a typical day: median AQI 44, with 8 days above AQI 100 out of 365 monitored — the 3rd cleanest of 7 years on record for the area.
- ✓Peak AQI in 2019: 154 (Unhealthy).
- ✓Ground-level ozone was the main pollutant on 188 days.
- ✓Cleanest month: October; worst: July.
Frequently asked questions
What was the average AQI in Hartford in 2019?▾
EPA's Air Quality System puts Hartford's (Hartford-West Hartford-East Hartford, CT) median daily AQI for 2019 at 44, which is Good. 8 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 154.
Which month had the worst air quality in Hartford in 2019?▾
The cleanest month of 2019 was October (median AQI 32, 0 days above 100) and the worst was July (median 57, 5 days above 100, peak 154).
Was 2019 a good or bad year for Hartford's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2019 ranks 3rd cleanest by days above AQI 100. 2019's median of 44 is in line with the area's typical annual median of 43.
Hartford month by month in 2019
Hartford air quality month by month, 2019 (Hartford-West Hartford-East Hartford, CT, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 41 | 0 | 62 | PM2.5 |
| February | 28 | 42 | 0 | 92 | PM2.5 |
| March | 31 | 48 | 0 | 78 | O3 |
| April | 30 | 45 | 0 | 67 | O3 |
| May | 31 | 44 | 0 | 67 | O3 |
| June | 30 | 45 | 0 | 100 | O3 |
| Julyworst | 31 | 57 | 5 | 154 | O3 |
| August | 31 | 49 | 1 | 119 | O3 |
| September | 30 | 34 | 2 | 122 | O3 |
| Octobercleanest | 31 | 32 | 0 | 58 | PM2.5 |
| November | 30 | 37 | 0 | 67 | PM2.5 |
| December | 31 | 47 | 0 | 91 | PM2.5 |
How 2019 compares
Among the 7 years EPA has published for the area (2019–2025), 2019 ranks 3rd cleanest by days above AQI 100.
2019'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.