Cleveland Air Quality in April
Across 2019–2025, Cleveland's April air quality had a median AQI of 50 (Good) over 210 monitored days in the Cleveland-Elyria, OH area. 1.0% of April days (2 of 210) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 51.4% of days. The cleanest April on record here was 2022 (median AQI 46, 0 days above 100) and the worst was 2023 (median 57, 1 day above 100, peak AQI 115).
- Good: 52.4%
- Moderate: 46.7%
- Unhealthy for Sensitive Groups: 1.0%
- Unhealthy or worse: 0.0%
Reduce Indoor Ozone in Cleveland
Today's main pollutant in Cleveland is ground-level ozone (AQI 44). 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, certain "ionizer" purifiers) and ventilating when outdoor ozone is low (early morning). A high-carbon unit helps with the gases and VOCs that linger indoors.
Recommended: Levoit Core 300 — True HEPA + activated carbon · CADR ~141 CFM · rooms up to 219 sq ft
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How is the air in Cleveland in April?
Good on a typical day: median AQI 50 across 2019–2025, with 1.0% of April days above AQI 100. Ground-level ozone is the main driver.
- ✓52.4% of April days were Good (AQI 0–50), 46.7% Moderate (51–100).
- ✓2 days of 210 reached AQI 101+; the April peak was 115.
- ✓Best April: 2022; worst April: 2023.
Frequently asked questions
What is the air quality like in Cleveland in April?▾
Across 2019–2025, the median daily AQI in Cleveland in April was 50 (Good). 52.4% of days were Good, 46.7% Moderate, and 1.0% 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 Cleveland?▾
A typical April day in Cleveland sits in the Good range (median AQI 50), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 100 of April days (1.0%) reached AQI 101+ in 2019–2025.
Which pollutant causes Cleveland's April air quality problems?▾
Ground-level ozone set the daily AQI on 51.4% of April days in Cleveland. The highest April AQI recorded in 2019–2025 was 115 (Unhealthy for Sensitive Groups), in 2023.
Cleveland April air quality, year by year
Cleveland April air quality by year (Cleveland-Elyria, OH, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 30 | 50 | 0 | 83 | PM2.5 |
| 2020 | 30 | 52 | 0 | 63 | PM2.5 |
| 2021 | 30 | 54 | 0 | 97 | PM2.5 |
| 2022cleanest | 30 | 46 | 0 | 73 | O3 |
| 2023worst | 30 | 57 | 1 | 115 | O3 |
| 2024 | 30 | 49 | 0 | 87 | O3 |
| 2025 | 30 | 48 | 1 | 101 | O3 |
What April air means in Cleveland
A typical April day in Cleveland sits in the Good range (median AQI 50), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 100 of April days (1.0%) reached AQI 101+ in 2019–2025.
April's median AQI of 50 is below Cleveland's whole-year median of 55, making it one of the area's cleaner periods. Nationally, the median April AQI across every EPA metro area (100,677 metro-days, 2019–2025) is 44, so Cleveland runs above the national April norm; 1.0% of its April days topped AQI 100 versus 0.7% nationally (about the same).
April is part of Cleveland's spring season (March, April, May); the spring page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Cleveland
The latest EPA AirNow observation puts Cleveland's AQI at 44 (O3). The figures above are multi-year month statistics, not today's reading.
View current Cleveland air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Cleveland-Elyria, OH), 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.