Insights: Cincinnati, OH-KY-IN metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 56 over 365 measured days in 2025, which corresponds to a Moderate band and a Poor metro-wide health grade. The monitored-day split lands at 95 Good days (26%), 255 Moderate (70%), and 13 Unhealthy-for-Sensitive-Groups (4%). The 90th-percentile AQI finished at 78 while the highest single-day reading hit 154 (Unhealthy). Metro residents averaged roughly 7.8 clean-air days per 30-day window across the reporting year.

Across the 2020–2025 trend window, the share of monitored days rated Good shifted by -0.3 points and the median AQI moved +1 points, which classifies the multi-year trajectory as stable. The annual record contains 2 days at Unhealthy or worse. On those days, the EPA recommends that sensitive groups limit prolonged outdoor exertion. Metros with comparable AQI profiles include Chicago-Naperville-Elgin, IL-IN-WI (29.9% good, AQI 56); St. Louis, MO-IL (31.2% good, AQI 56); Bishop, CA (37.3% good, AQI 55).