Insights: Havre, MT metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 14 over 304 measured days in 2025, which corresponds to a Good band and a Excellent metro-wide health grade. The monitored-day split lands at 280 Good days (92%), 22 Moderate (7%), and 1 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 40 while the highest single-day reading hit 157 (Unhealthy). Metro residents averaged roughly 27.6 clean-air days per 30-day window across the reporting year.

Across the 2023–2025 trend window, the share of monitored days rated Good shifted by +11.8 points (measured against 211 monitored days in 2023 and 303 in 2025, so raw day counts are not comparable) and the median AQI moved -9 points, which classifies the multi-year trajectory as improving. 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 Show Low, AZ (99.5% good, AQI 13); Taos, NM (98.9% good, AQI 16); Bozeman, MT (98.1% good, AQI 11).