What is the air quality trend in Fort Collins?

Over the past 8 days, Fort Collins had an average AQI of 17 based on station measurements. The worst day was 2026-09-05 with AQI 19.

How is Fort Collins air quality measured?

Air quality in Fort Collins 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 Fort Collins, United States

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

Historical PM2.5 and AQI trend from monitoring stations near Fort Collins, United States.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

164h

PM2.5 Station

164h · 6 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-09-05	19	14–33	4.4 µg/m³	18.8	20h	6
2026-09-04	17	13–25	4.1 µg/m³	20.6	24h	6
2026-09-03	17	13–30	4.1 µg/m³	11.2	24h	6
2026-09-02	17	13–24	4.0 µg/m³	14.0	24h	6
2026-09-01	17	14–37	4.1 µg/m³	10.6	23h	6
2026-08-31	17	13–31	4.2 µg/m³	16.0	24h	6
2026-08-30	15	11–25	3.5 µg/m³	9.5	24h	6
2026-08-29	18	18–18	4.2 µg/m³	9.0	1h	7

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