Manchester Air Quality in April
Across 2019–2025, Manchester's April air quality had a median AQI of 43 (Good) over 210 monitored days in the Manchester-Nashua, NH area. 0.5% of April days (1 of 210) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 99.5% of days. The cleanest April on record here was 2021 (median AQI 40, 0 days above 100) and the worst was 2023 (median 47, 1 day above 100, peak AQI 112).
- Good: 90.5%
- Moderate: 9.0%
- Unhealthy for Sensitive Groups: 0.5%
- Unhealthy or worse: 0.0%
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How is the air in Manchester in April?
Good on a typical day: median AQI 43 across 2019–2025, with 0.5% of April days above AQI 100. Ground-level ozone is the main driver.
- ✓90.5% of April days were Good (AQI 0–50), 9.0% Moderate (51–100).
- ✓1 day of 210 reached AQI 101+; the April peak was 112.
- ✓Best April: 2021; worst April: 2023.
Frequently asked questions
What is the air quality like in Manchester in April?▾
Across 2019–2025, the median daily AQI in Manchester in April was 43 (Good). 90.5% of days were Good, 9.0% Moderate, and 0.5% reached Unhealthy for Sensitive Groups or worse, based on 210 monitored days in EPA's Air Quality System.
Is April a good time for outdoor exercise in Manchester?▾
A typical April day in Manchester sits in the Good range (median AQI 43), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of April days reached AQI 101+ in 2019–2025.
Which pollutant causes Manchester's April air quality problems?▾
Ground-level ozone set the daily AQI on 99.5% of April days in Manchester. The highest April AQI recorded in 2019–2025 was 112 (Unhealthy for Sensitive Groups), in 2023.
Manchester April air quality, year by year
Manchester April air quality by year (Manchester-Nashua, NH, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 30 | 43 | 0 | 51 | O3 |
| 2020 | 30 | 43 | 0 | 51 | O3 |
| 2021cleanest | 30 | 40 | 0 | 74 | O3 |
| 2022 | 30 | 44 | 0 | 54 | O3 |
| 2023worst | 30 | 47 | 1 | 112 | O3 |
| 2024 | 30 | 43 | 0 | 58 | O3 |
| 2025 | 30 | 44 | 0 | 84 | O3 |
What April air means in Manchester
A typical April day in Manchester sits in the Good range (median AQI 43), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of April days reached AQI 101+ in 2019–2025.
April's median AQI of 43 is above Manchester's whole-year median of 37, making it one of the area's dirtier periods. Nationally, the median April AQI across every EPA metro area (100,677 metro-days, 2019–2025) is 44, so Manchester runs in line with the national April norm; 0.5% of its April days topped AQI 100 versus 0.7% nationally (about the same).
April is part of Manchester's spring season (March, April, May); the spring page pools all three months.
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 month 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.