Insights: Havre, MT metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 15 over 339 measured days in 2024, which corresponds to a Good band and a Excellent metro-wide health grade. The monitored-day split lands at 314 Good days (93%), 23 Moderate (7%), and 2 Unhealthy-for-Sensitive-Groups (1%). The 90th-percentile AQI finished at 46 while the highest single-day reading hit 123 (USG). Metro residents averaged roughly 27.8 clean-air days per 30-day window across the reporting year.

Across the 2023–2024 trend window, good days shifted by +144 and the median AQI moved -8 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 Guayama, PR (98.1% good, AQI 15); Los Alamos, NM (100.0% good, AQI 14); Ruidoso, NM (97.4% good, AQI 16).