Great Falls, MT Air Quality
Report & Trends
Analysis & History
The Verdict
Compared to other metro areas, Great Falls, MT scores exceptionally well.
Historically, March brings the highest volume of particulate matter.
Health Recommendation
Sensitive groups should consider monitoring daily forecast apps significantly closer.
10-Year Annual PM2.5 Average
Analysis: Annual average Median AQI from 2015 to 2025.
Great Falls, MT ranks as one of the cleanest cities in our database, but it isn't immune to seasonal spikes. Alarmingly, annual PM2.5 averages have worsened over the last decade, largely driven by particle pollution.
Seasonal Risk Calendar
The "Smoke Season" Calendar
Values represent historical Average Monthly AQI (PM2.5). Higher is worse.
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Common Questions
When is the worst time for air quality in Great Falls, MT?
Based on 10 years of data, the worst months for air quality in Great Falls, MT are: March (AQI 47.4), January (AQI 46.6), February (AQI 43.8). These months typically see the highest concentrations of PM2.5 due to fine particulate matter trapped by local geography.
Is it safe to move to Great Falls, MT given the air quality?
Absolutely. Great Falls, MT has some of the cleanest air in the country. While no place is immune to occasional regional smoke, the long-term data shows it is a safe and healthy environment for residents.
Why is the air in Great Falls, MT getting worse?
The primary driver is industrial activity and inversion layers. While local vehicle emissions have largely stabilized, fine particulate matter trapped by local geography frequently settles in the Great Falls, MT valley, driving up the annual PM2.5 averages.
Do I really need an air purifier in Great Falls, MT?
For daily use, likely not. Great Falls, MT's air quality consistently rates as "Good." However, owning one as a precaution for wildfire season or allergy relief is still a smart decision for sensitive groups.
How accurate is this data?
This report is built on official EPA Air Quality System (AQS) data. We aggregated daily summary files from 2014 to present to build these charts. Unlike real-time apps that estimate, this is the verified historical record.
Is Great Falls, MT safe from other disasters?
Air quality is just one factor. Check our sister site for a complete analysis of tornado, hurricane, and flood risks.
Full Safety Report →Summary
Looking at the 10-year chart, the trend is undeniable. Cleaner air is possible, but it requires active management.