Manchester Air Quality in Spring
Across 2019–2025, Manchester's spring (March–May) air quality had a median AQI of 43 (Good) over 644 monitored days in the Manchester-Nashua, NH area. 0.2% of spring days (1 of 644) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 98.8% of days. The cleanest spring on record here was 2021 (median AQI 41, 0 days above 100) and the worst was 2023 (median 46, 1 day above 100, peak AQI 112).
- Good: 89.9%
- Moderate: 9.9%
- Unhealthy for Sensitive Groups: 0.2%
- Unhealthy or worse: 0.0%
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How is the air in Manchester in spring?
Good on a typical day: median AQI 43 across 2019–2025, with 0.2% of spring days above AQI 100. Ground-level ozone is the main driver.
- ✓89.9% of spring days were Good (AQI 0–50), 9.9% Moderate (51–100).
- ✓1 day of 644 reached AQI 101+; the spring peak was 112.
- ✓Cleanest month: May; worst month: April.
Frequently asked questions
What is the air quality like in Manchester in spring?▾
Across 2019–2025, the median daily AQI in Manchester in spring was 43 (Good). 89.9% of days were Good, 9.9% Moderate, and 0.2% reached Unhealthy for Sensitive Groups or worse, based on 644 monitored days in EPA's Air Quality System.
Is spring a good time for outdoor exercise in Manchester?▾
A typical spring 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 spring days reached AQI 101+ in 2019–2025.
Which pollutant causes Manchester's spring air quality problems?▾
Ground-level ozone set the daily AQI on 98.8% of spring days in Manchester. The highest spring AQI recorded in 2019–2025 was 112 (Unhealthy for Sensitive Groups), in 2023.
Manchester spring air quality, year by year
Manchester spring air quality by year (Manchester-Nashua, NH, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 92 | 43 | 0 | 58 | O3 |
| 2020 | 92 | 42 | 0 | 51 | O3 |
| 2021cleanest | 92 | 41 | 0 | 97 | O3 |
| 2022 | 92 | 44 | 0 | 74 | O3 |
| 2023worst | 92 | 46 | 1 | 112 | O3 |
| 2024 | 92 | 41 | 0 | 97 | O3 |
| 2025 | 92 | 42 | 0 | 84 | O3 |
What spring air means in Manchester
A typical spring 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 spring days reached AQI 101+ in 2019–2025.
Spring'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 Spring AQI across every EPA metro area (307,196 metro-days, 2019–2025) is 43, so Manchester runs in line with the national Spring norm; 0.2% of its Spring days topped AQI 100 versus 0.8% nationally (about the same).
Within the season, May is the cleanest month (median AQI 42, 0.0% of days above 100) and April the worst (median 43, 0.5% above 100).
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 season 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.