What is the air quality trend in Great Falls?

Over the past 15 days, Great Falls had an average AQI of 34 based on station measurements. The worst day was 2026-09-01 with AQI 53.

How is Great Falls air quality measured?

Air quality in Great Falls is measured by ground-level monitoring stations that report PM2.5 and PM10 concentrations hourly. CERNS.IO aggregates readings from nearby stations and converts PM2.5 to the US EPA Air Quality Index (AQI) scale.

Air Quality History for Great Falls, United States

Name: Great Falls Air Quality History
Creator: CERNS.IO
License: https://creativecommons.org/licenses/by/4.0/

Historical PM2.5 and AQI trend from monitoring stations near Great Falls, United States.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

334h

PM2.5 Station

334h · 1 station

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-09-05	30	25–34	7.1 µg/m³	21h	25
2026-09-04	31	21–52	7.4 µg/m³	24h	26
2026-09-03	31	20–51	7.5 µg/m³	24h	26
2026-09-02	38	25–52	9.3 µg/m³	24h	28
2026-09-01	53	32–56	13.1 µg/m³	24h	26
2026-08-31	38	25–54	9.1 µg/m³	24h	28
2026-08-30	33	26–43	8.0 µg/m³	24h	28
2026-08-29	34	23–43	8.2 µg/m³	24h	27
2026-08-28	39	32–48	9.4 µg/m³	24h	28
2026-08-27	40	31–50	9.6 µg/m³	24h	29
2026-08-26	33	26–38	7.9 µg/m³	24h	28
2026-08-25	38	28–45	9.1 µg/m³	24h	28
2026-08-24	34	28–43	8.2 µg/m³	24h	28
2026-08-23	26	16–39	6.3 µg/m³	24h	28
2026-08-22	22	22–22	5.3 µg/m³	1h	27

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