Rochester Air Quality in April
Across 2019–2025, Rochester's April air quality had a median AQI of 42 (Good) over 210 monitored days in the Rochester, NY 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 78.1% of days. The cleanest April on record here was 2022 (median AQI 38, 0 days above 100) and the worst was 2023 (median 44, 1 day above 100, peak AQI 108).
- Good: 82.9%
- Moderate: 16.7%
- Unhealthy for Sensitive Groups: 0.5%
- Unhealthy or worse: 0.0%
Reducing Indoor Ozone
Important: standard HEPA filters do NOT remove ozone — only a purifier with a substantial activated-carbon bed adsorbs it. The biggest wins are cutting indoor sources (gas appliances, "ionizer" purifiers) and ventilating when outdoor ozone is low (early morning). A high-carbon unit also helps with the gases and VOCs that linger indoors.
Recommended: Coway AP-1512HH (HEPA + Carbon) — True HEPA + activated carbon layer · rooms up to 361 sq ft
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How is the air in Rochester in April?
Good on a typical day: median AQI 42 across 2019–2025, with 0.5% of April days above AQI 100. Ground-level ozone is the main driver.
- ✓82.9% of April days were Good (AQI 0–50), 16.7% Moderate (51–100).
- ✓1 day of 210 reached AQI 101+; the April peak was 108.
- ✓Best April: 2022; worst April: 2023.
Frequently asked questions
What is the air quality like in Rochester in April?▾
Across 2019–2025, the median daily AQI in Rochester in April was 42 (Good). 82.9% of days were Good, 16.7% 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 Rochester?▾
A typical April day in Rochester sits in the Good range (median AQI 42), 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 Rochester's April air quality problems?▾
Ground-level ozone set the daily AQI on 78.1% of April days in Rochester. The highest April AQI recorded in 2019–2025 was 108 (Unhealthy for Sensitive Groups), in 2023.
Rochester April air quality, year by year
Rochester April air quality by year (Rochester, NY, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 30 | 44 | 0 | 67 | O3 |
| 2020 | 30 | 42 | 0 | 51 | O3 |
| 2021 | 30 | 42 | 0 | 74 | O3 |
| 2022cleanest | 30 | 38 | 0 | 56 | O3 |
| 2023worst | 30 | 44 | 1 | 108 | O3 |
| 2024 | 30 | 39 | 0 | 55 | O3 |
| 2025 | 30 | 42 | 0 | 67 | O3 |
What April air means in Rochester
A typical April day in Rochester sits in the Good range (median AQI 42), 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 42 is in line with Rochester's whole-year median of 42, so this period is neither a clean nor a dirty stretch for the area. Nationally, the median April AQI across every EPA metro area (100,677 metro-days, 2019–2025) is 44, so Rochester 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 Rochester's spring season (March, April, May); the spring page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Rochester, NY), 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.