Cincinnati Air Quality in 2025
In 2025, Cincinnati's air quality (Cincinnati, OH-KY-IN area) had a median daily AQI of 56 (Moderate) across 365 monitored days. 15 days (4.1%) reached Unhealthy for Sensitive Groups or worse, 95 were Good, and the year's peak AQI was 154 (Unhealthy). Fine particulate matter (PM2.5) set the daily AQI on 280 of those days. The cleanest month of 2025 was April (median AQI 51, 0 days above 100) and the worst was September (median 68, 7 days above 100, peak 150).
- Good: 26.0%
- Moderate: 69.9%
- Unhealthy for Sensitive Groups: 3.6%
- Unhealthy or worse: 0.5%
Extra Protection for Cincinnati Homes
Air quality in Cincinnati is moderate (AQI 65), with fine particles (PM2.5) the main concern. A True-HEPA purifier gives sensitive groups — kids, seniors and anyone with asthma or allergies — cleaner air indoors on days like today.
Recommended: Coway AP-1512HH Mighty — True HEPA + carbon · CADR ~246 CFM · rooms up to 361 sq ft
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How was Cincinnati's air quality in 2025?
Moderate on a typical day: median AQI 56, with 15 days above AQI 100 out of 365 monitored — the 6th cleanest of 7 years on record for the area.
- ✓Peak AQI in 2025: 154 (Unhealthy).
- ✓Fine particulate matter (PM2.5) was the main pollutant on 280 days.
- ✓Cleanest month: April; worst: September.
Frequently asked questions
What was the average AQI in Cincinnati in 2025?▾
EPA's Air Quality System puts Cincinnati's (Cincinnati, OH-KY-IN) median daily AQI for 2025 at 56, which is Moderate. 15 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 154.
Which month had the worst air quality in Cincinnati in 2025?▾
The cleanest month of 2025 was April (median AQI 51, 0 days above 100) and the worst was September (median 68, 7 days above 100, peak 150).
Was 2025 a good or bad year for Cincinnati's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2025 ranks 6th cleanest by days above AQI 100. 2025's median of 56 is in line with the area's typical annual median of 56.
Cincinnati month by month in 2025
Cincinnati air quality month by month, 2025 (Cincinnati, OH-KY-IN, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 53 | 0 | 84 | PM2.5 |
| February | 28 | 56 | 0 | 84 | PM2.5 |
| March | 31 | 53 | 0 | 97 | PM2.5 |
| Aprilcleanest | 30 | 51 | 0 | 71 | PM2.5 |
| May | 31 | 52 | 0 | 84 | PM2.5 |
| June | 30 | 61 | 4 | 126 | PM2.5 |
| July | 31 | 65 | 4 | 154 | PM2.5 |
| August | 31 | 56 | 0 | 84 | PM2.5 |
| Septemberworst | 30 | 68 | 7 | 150 | O3 |
| October | 31 | 52 | 0 | 93 | PM2.5 |
| November | 30 | 55 | 0 | 78 | PM2.5 |
| December | 31 | 58 | 0 | 80 | PM2.5 |
How 2025 compares
Among the 7 years EPA has published for the area (2019–2025), 2025 ranks 6th cleanest by days above AQI 100.
2025's median of 56 is in line with the area's typical annual median of 56.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Cincinnati
The latest EPA AirNow observation puts Cincinnati's AQI at 65 (PM2.5). The figures above are multi-year annual statistics, not today's reading.
View current Cincinnati air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Cincinnati, OH-KY-IN), 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.