Manchester Air Quality in 2024
In 2024, Manchester's air quality (Manchester-Nashua, NH area) had a median daily AQI of 37 (Good) across 366 monitored days. 0 days (0.0%) reached Unhealthy for Sensitive Groups or worse, 328 were Good, and the year's peak AQI was 97 (Moderate). Ground-level ozone set the daily AQI on 324 of those days. The cleanest month of 2024 was January (median AQI 31, 0 days above 100) and the worst was July (median 43, 0 days above 100, peak 65).
- Good: 89.6%
- Moderate: 10.4%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
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How was Manchester's air quality in 2024?
Good on a typical day: median AQI 37, with 0 days above AQI 100 out of 366 monitored — the 3rd cleanest of 7 years on record for the area.
- ✓Peak AQI in 2024: 97 (Moderate).
- ✓Ground-level ozone was the main pollutant on 324 days.
- ✓Cleanest month: January; worst: July.
Frequently asked questions
What was the average AQI in Manchester in 2024?▾
EPA's Air Quality System puts Manchester's (Manchester-Nashua, NH) median daily AQI for 2024 at 37, which is Good. 0 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 97.
Which month had the worst air quality in Manchester in 2024?▾
The cleanest month of 2024 was January (median AQI 31, 0 days above 100) and the worst was July (median 43, 0 days above 100, peak 65).
Was 2024 a good or bad year for Manchester's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2024 ranks 3rd cleanest by days above AQI 100. 2024's median of 37 is in line with the area's typical annual median of 37.
Manchester month by month in 2024
Manchester air quality month by month, 2024 (Manchester-Nashua, NH, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| Januarycleanest | 31 | 31 | 0 | 35 | O3 |
| February | 29 | 37 | 0 | 46 | O3 |
| March | 31 | 40 | 0 | 47 | O3 |
| April | 30 | 43 | 0 | 58 | O3 |
| May | 31 | 40 | 0 | 97 | O3 |
| June | 30 | 41 | 0 | 84 | O3 |
| Julyworst | 31 | 43 | 0 | 65 | O3 |
| August | 31 | 38 | 0 | 68 | O3 |
| September | 30 | 34 | 0 | 84 | O3 |
| October | 31 | 32 | 0 | 77 | O3 |
| November | 30 | 31 | 0 | 38 | O3 |
| December | 31 | 33 | 0 | 52 | O3 |
How 2024 compares
Among the 7 years EPA has published for the area (2019–2025), 2024 ranks 3rd cleanest by days above AQI 100.
2024's median of 37 is in line with the area's typical annual median of 37.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Manchester
The latest EPA AirNow observation puts Manchester's AQI at 24 (PM2.5). The figures above are multi-year annual statistics, not today's reading.
View current Manchester air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Manchester-Nashua, NH), 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.