Insights: Moses Lake, WA metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 28 over 365 measured days in 2025, which corresponds to a Good band and a Good metro-wide health grade. The monitored-day split lands at 291 Good days (80%), 71 Moderate (19%), and 2 Unhealthy-for-Sensitive-Groups (1%). The 90th-percentile AQI finished at 59 while the highest single-day reading hit 154 (Unhealthy). Metro residents averaged roughly 23.9 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 -10.1 points and the median AQI moved +7 points, which classifies the multi-year trajectory as worsening. The annual record contains 1 day at Unhealthy or worse. On that day, the EPA recommends that sensitive groups limit prolonged outdoor exertion. Metros with comparable AQI profiles include Butte-Silver Bow, MT (84.9% good, AQI 28); Dodge City, KS (89.8% good, AQI 28); Prineville, OR (72.9% good, AQI 28).