Manchester Air Quality in July
Across 2019–2025, Manchester's July air quality had a median AQI of 41 (Good) over 217 monitored days in the Manchester-Nashua, NH area. 1.8% of July days (4 of 217) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 73.7% of days. The cleanest July on record here was 2020 (median AQI 37, 0 days above 100) and the worst was 2021 (median 38, 2 days above 100, peak AQI 144).
- Good: 77.4%
- Moderate: 20.7%
- Unhealthy for Sensitive Groups: 1.8%
- Unhealthy or worse: 0.0%
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How is the air in Manchester in July?
Good on a typical day: median AQI 41 across 2019–2025, with 1.8% of July days above AQI 100. Ground-level ozone is the main driver.
- ✓77.4% of July days were Good (AQI 0–50), 20.7% Moderate (51–100).
- ✓4 days of 217 reached AQI 101+; the July peak was 144.
- ✓Best July: 2020; worst July: 2021.
Frequently asked questions
What is the air quality like in Manchester in July?▾
Across 2019–2025, the median daily AQI in Manchester in July was 41 (Good). 77.4% of days were Good, 20.7% Moderate, and 1.8% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is July a good time for outdoor exercise in Manchester?▾
A typical July day in Manchester sits in the Good range (median AQI 41), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 56 of July days (1.8%) reached AQI 101+ in 2019–2025.
Which pollutant causes Manchester's July air quality problems?▾
Ground-level ozone set the daily AQI on 73.7% of July days in Manchester. The highest July AQI recorded in 2019–2025 was 144 (Unhealthy for Sensitive Groups), in 2021.
Manchester July air quality, year by year
Manchester July air quality by year (Manchester-Nashua, NH, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 31 | 39 | 0 | 57 | O3 |
| 2020cleanest | 31 | 37 | 0 | 67 | O3 |
| 2021worst | 31 | 38 | 2 | 144 | O3 |
| 2022 | 31 | 42 | 0 | 100 | O3 |
| 2023 | 31 | 45 | 1 | 109 | O3 |
| 2024 | 31 | 43 | 0 | 65 | O3 |
| 2025 | 31 | 43 | 1 | 123 | O3 |
What July air means in Manchester
A typical July day in Manchester sits in the Good range (median AQI 41), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 56 of July days (1.8%) reached AQI 101+ in 2019–2025.
July's median AQI of 41 is above Manchester's whole-year median of 37, making it one of the area's dirtier periods. Nationally, the median July AQI across every EPA metro area (103,858 metro-days, 2019–2025) is 47, so Manchester runs below the national July norm; 1.8% of its July days topped AQI 100 versus 3.6% nationally (below average).
July is part of Manchester's summer season (June, July, August); the summer 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.