Insights: Detroit-Warren-Dearborn, MI metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 54 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 132 Good days (36%), 217 Moderate (59%), and 13 Unhealthy-for-Sensitive-Groups (4%). The 90th-percentile AQI finished at 80 while the highest single-day reading hit 166 (Unhealthy). Metro residents averaged roughly 10.8 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 +4.0 points and the median AQI moved -1 points, which classifies the multi-year trajectory as improving. The annual record contains 3 days at Unhealthy or worse. On those days, the EPA recommends that sensitive groups limit prolonged outdoor exertion. Metros with comparable AQI profiles include Baton Rouge, LA (35.6% good, AQI 54); Cleveland-Elyria, OH (42.5% good, AQI 54); Columbus, OH (39.7% good, AQI 54).