Insights: Jacksonville, FL 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 182 Good days (50%), 184 Moderate (50%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 64 while the highest single-day reading hit 98 (Moderate). Metro residents averaged roughly 14.9 clean-air days per 30-day window across the reporting year.

Across the 2020–2024 trend window, good days shifted by +24 and the median AQI moved -1 points, which classifies the multi-year trajectory as improving. 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 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).