Insights: El Centro, CA metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 64 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 101 Good days (28%), 220 Moderate (60%), and 34 Unhealthy-for-Sensitive-Groups (9%). The 90th-percentile AQI finished at 108 while the highest single-day reading hit 426 (Hazardous). Metro residents averaged roughly 8.3 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 +3.0 points and the median AQI moved +4 points, which classifies the multi-year trajectory as stable. The annual record contains 10 days at Unhealthy or worse. On those days, the EPA recommends that sensitive groups limit prolonged outdoor exertion. Metros with comparable AQI profiles include Visalia-Porterville, CA (24.1% good, AQI 64); Houston-The Woodlands-Sugar Land, TX (10.1% good, AQI 63); Albuquerque, NM (24.9% good, AQI 61).