Insights: Sacramento--Roseville--Arden-Arcade, CA metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 54 over 273 measured days in 2025, which corresponds to a Moderate band and a Poor metro-wide health grade. The monitored-day split lands at 112 Good days (41%), 158 Moderate (58%), and 3 Unhealthy-for-Sensitive-Groups (1%). The 90th-percentile AQI finished at 77 while the highest single-day reading hit 143 (USG). Metro residents averaged roughly 12.3 clean-air days per 30-day window across the reporting year.

Across the 2020–2025 trend window, good days shifted by +9 and the median AQI moved -9 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 Baton Rouge, LA (35.0% good, AQI 54); Bishop, CA (40.7% good, AQI 54); Chicago-Naperville-Elgin, IL-IN-WI (34.3% good, AQI 54).