Bad Air Days in Chase County, Kansas

Not enough data

EPA monitors in Chase County ran on too few days between 2016 and 2025 to give a fair yearly count (about 32% 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

The worst recent year was 2016, with 2 bad days on 118 monitored days.

Date	AQI	Main pollutant
2016-04-15	148	PM2.5
2016-04-12	133	PM2.5
2019-04-09	113	PM2.5
2021-08-02	99	PM2.5
2025-03-14	95	PM2.5

Most days, not the worst ones

Across 1,170 monitored days from 2016 to 2025, the air in Chase County rated Good on 87% of them, more often than the 72% typical of monitored counties, and Moderate on 13%. The median day sat at AQI 27; one day in ten went above 52.

The pollutant setting the AQI on an ordinary day here:

fine particles (PM2.5)100%1,170 days

Year by year

Year	Days monitored	Good	Moderate	Over 100	Over 150	Median AQI	Highest AQI
2025*	99	82	17	0	0	31	95
2024	122	106	16	0	0	29	94
2023	117	98	19	0	0	29	79
2022	121	110	11	0	0	25	66
2021	120	102	18	0	0	27	99
2020	121	110	11	0	0	24	63
2019	118	105	12	1	0	27	113
2018	116	96	20	0	0	30	67
2017	118	100	18	0	0	28	65
2016	118	105	11	2	0	24	148
2015	119	97	22	0	0	26	85
2014	120	84	35	1	1	33	154
2013	120	93	27	0	0	34	71
2012	117	88	29	0	0	35	90
2011	117	86	31	0	0	35	95
2010	121	93	27	1	0	31	138

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

Nearby counties on file

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.