Bad Air Days in Chaffee County, Colorado

Not enough data

EPA monitors in Chaffee County ran on too few days between 2016 and 2025 to give a fair yearly count (about 38% of days covered). Neighbouring counties below are a better guide.

What to buy, and what not to

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

The record for Chaffee

The worst recent year was 2021, with 6 bad days on 112 monitored days.

Date	AQI	Main pollutant
2018-06-11	161	Ozone
2021-07-19	119	Ozone
2022-06-15	119	Ozone
2023-05-09	115	Ozone
2018-06-24	112	Ozone

An ordinary day in Chaffee

Across 1,370 monitored days from 2016 to 2025, the air in Chaffee County rated Good on 57% of them, less often than the 72% typical of monitored counties, and Moderate on 41%. The median day sat at AQI 51; one day in ten went above 77.

The pollutant setting the AQI on an ordinary day here:

ozone100%1,370 days

Chaffee County by year

Year	Days monitored	Good	Moderate	Over 100	Over 150	Median AQI	Highest AQI
2025*	103	68	30	5	0	48	108
2024	161	74	82	5	0	51	112
2023	166	66	96	4	0	58	115
2022	156	98	57	1	0	49	119
2021	112	47	59	6	0	58	119
2020	69	37	29	3	0	50	101
2019	144	80	63	1	0	50	108
2018	164	67	91	6	1	58	161
2017	144	144	0	0	0	35	44
2016	151	97	51	3	0	47	105
2015	100	65	34	1	0	47	108
2014	150	103	47	0	0	47	100
2013	145	59	82	4	0	54	126
2012	69	33	34	2	0	54	108
2011	153	83	64	6	0	50	112
2010	128	70	55	3	0	50	101

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

Colorado compared

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, and on why a purifier does not touch ozone in smoke vs ozone.