Hartford Air Quality in August
Across 2019–2025, Hartford's August air quality had a median AQI of 48 (Good) over 217 monitored days in the Hartford-West Hartford-East Hartford, CT area. 5.1% of August days (11 of 217) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 59.0% of days. The cleanest August on record here was 2023 (median AQI 44, 0 days above 100) and the worst was 2025 (median 50, 3 days above 100, peak AQI 164).
- Good: 56.2%
- Moderate: 38.7%
- Unhealthy for Sensitive Groups: 4.6%
- Unhealthy or worse: 0.5%
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How is the air in Hartford in August?
Good on a typical day: median AQI 48 across 2019–2025, with 5.1% of August days above AQI 100. Ground-level ozone is the main driver.
- ✓56.2% of August days were Good (AQI 0–50), 38.7% Moderate (51–100).
- ✓11 days of 217 reached AQI 101+; the August peak was 164.
- ✓Best August: 2023; worst August: 2025.
Frequently asked questions
What is the air quality like in Hartford in August?▾
Across 2019–2025, the median daily AQI in Hartford in August was 48 (Good). 56.2% of days were Good, 38.7% Moderate, and 5.1% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is August a good time for outdoor exercise in Hartford?▾
A typical August day in Hartford sits in the Good range (median AQI 48), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 20 of August days (5.1%) reached AQI 101+ in 2019–2025.
Which pollutant causes Hartford's August air quality problems?▾
Ground-level ozone set the daily AQI on 59.0% of August days in Hartford. The highest August AQI recorded in 2019–2025 was 164 (Unhealthy), in 2025.
Hartford August air quality, year by year
Hartford August air quality by year (Hartford-West Hartford-East Hartford, CT, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 31 | 49 | 1 | 119 | O3 |
| 2020 | 31 | 51 | 1 | 101 | O3 |
| 2021 | 31 | 49 | 3 | 129 | O3 |
| 2022 | 31 | 46 | 3 | 147 | O3 |
| 2023cleanest | 31 | 44 | 0 | 65 | PM2.5 |
| 2024 | 31 | 46 | 0 | 81 | O3 |
| 2025worst | 31 | 50 | 3 | 164 | O3 |
What August air means in Hartford
A typical August day in Hartford sits in the Good range (median AQI 48), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 20 of August days (5.1%) reached AQI 101+ in 2019–2025.
August's median AQI of 48 is above Hartford's whole-year median of 43, making it one of the area's dirtier periods. Nationally, the median August AQI across every EPA metro area (104,152 metro-days, 2019–2025) is 45, so Hartford runs in line with the national August norm; 5.1% of its August days topped AQI 100 versus 3.5% nationally (above average).
August is part of Hartford's summer season (June, July, August); the summer page pools all three months.
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 month 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.