Insights: Muscatine, IA metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 41 over 304 measured days in 2025, which corresponds to a Good band and a Moderate metro-wide health grade. The monitored-day split lands at 208 Good days (68%), 94 Moderate (31%), and 2 Unhealthy-for-Sensitive-Groups (1%). The 90th-percentile AQI finished at 58 while the highest single-day reading hit 141 (USG). Metro residents averaged roughly 20.5 clean-air days per 30-day window across the reporting year.

Across the 2020–2025 trend window, good days shifted by -37 and the median AQI moved +1 points, which classifies the multi-year trajectory as stable. The metro avoided any Unhealthy-tier days entirely, an outcome that typically reflects favorable wind patterns, lower industrial density, or effective regional emission controls. Metros with comparable AQI profiles include Adrian, MI (77.3% good, AQI 41); Altoona, PA (71.9% good, AQI 41); Ann Arbor, MI (76.0% good, AQI 41).