Bad Air Days in Fremont County, Colorado

Not enough data

EPA monitors in Fremont County ran on too few days between 2016 and 2025 to give a fair yearly count (about 34% of days covered). Neighbouring counties below are a better guide.

Is a purifier worth it here?

EPA monitors here ran too few days to give a fair yearly count. Use AirNow for today's air.

Better or worse than it was

Date	AQI	Main pollutant
2022-05-08	77	PM10
2025-09-05	77	PM2.5
2022-04-11	76	PM10
2023-04-03	71	PM10
2025-08-14	70	PM2.5

An ordinary day in Fremont

Across 1,251 monitored days from 2016 to 2025, the air in Fremont County rated Good on 97% of them, more often than the 72% typical of monitored counties, and Moderate on 3%. The median day sat at AQI 16; one day in ten went above 32.

The pollutant setting the AQI on an ordinary day here:

coarse dust (PM10)79%988 days
fine particles (PM2.5)21%263 days

Every recent year on file

Year	Days monitored	Good	Moderate	Median AQI	Highest AQI
2025*	362	338	24	23	77
2024	362	354	8	13	59
2023	163	162	1	12	71
2022	118	115	3	12	77
2021	86	85	1	15	62
2020	17	17	0	11	27
2019	32	32	0	13	29
2018	20	20	0	15	36
2017	39	39	0	11	44
2016	52	52	0	14	50
2015	57	57	0	11	37
2014	59	58	1	15	51
2013	62	60	2	16	78
2012	57	56	1	15	54
2011	57	55	2	15	59
2010	54	54	0	14	29

*2025 may be a partial year in EPA's file.

Elsewhere in Colorado

How this is counted

A bad air day is a day the county's daily AQI from EPA AirData went above 100, the level where EPA tells children, older adults and people with asthma or heart disease to cut back outdoors. Monitors do not run every day, so yearly counts are scaled to 365 days. This is the record, not today's air: for that, check AirNow. More on the method in how the county numbers are made, on the AQI 100 line in what counts as a bad air day.