Insights: Louisville/Jefferson County, KY-IN metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 51 over 366 measured days in 2024, which corresponds to a Moderate band and a Poor metro-wide health grade. The monitored-day split lands at 173 Good days (47%), 180 Moderate (49%), and 12 Unhealthy-for-Sensitive-Groups (3%). The 90th-percentile AQI finished at 77 while the highest single-day reading hit 156 (Unhealthy). Metro residents averaged roughly 14.2 clean-air days per 30-day window across the reporting year.

Across the 2020–2024 trend window, good days shifted by +29 and the median AQI moved -2 points, which classifies the multi-year trajectory as improving. The metro recorded 1 unhealthy-or-worse days combined, on those days the EPA recommends that sensitive groups limit prolonged outdoor exertion, and many schools and athletic programs adjust outdoor activity accordingly. Metros with comparable AQI profiles include Corpus Christi, TX (48.6% good, AQI 51); Durham-Chapel Hill, NC (46.2% good, AQI 51); Grand Rapids-Wyoming, MI (48.6% good, AQI 51).