Insights: Indianapolis-Carmel-Anderson, IN metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 53 over 305 measured days in 2025, which corresponds to a Moderate band and a Poor metro-wide health grade. The monitored-day split lands at 124 Good days (41%), 174 Moderate (57%), and 5 Unhealthy-for-Sensitive-Groups (2%). The 90th-percentile AQI finished at 74 while the highest single-day reading hit 170 (Unhealthy). Metro residents averaged roughly 12.2 clean-air days per 30-day window across the reporting year.

Across the 2020–2025 trend window, good days shifted by +18 and the median AQI moved -3 points, which classifies the multi-year trajectory as improving. The metro recorded 2 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 Austin-Round Rock, TX (41.0% good, AQI 53); Beaumont-Port Arthur, TX (35.4% good, AQI 53); Detroit-Warren-Dearborn, MI (45.1% good, AQI 53).