Bad Air Days in Klickitat County, Washington

Not enough data

EPA monitors in Klickitat County ran on too few days between 2016 and 2025 to give a fair yearly count (about 47% 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.

The record for Klickitat

The worst recent year was 2020, with 9 bad days on 318 monitored days.

Date	AQI	Main pollutant
2020-09-12	1358	PM2.5
2020-09-11	1220	PM2.5
2020-09-13	1196	PM2.5
2020-09-14	968	PM2.5
2020-09-15	532	PM2.5

Most days, not the worst ones

Across 1,732 monitored days from 2016 to 2025, the air in Klickitat County rated Good on 86% of them, more often than the 72% typical of monitored counties, and Moderate on 13%. The median day sat at AQI 23; one day in ten went above 52.

The pollutant setting the AQI on an ordinary day here:

fine particles (PM2.5)100%1,732 days

Klickitat County by year

Year	Days monitored	Good	Moderate	Over 100	Over 150	Median AQI	Highest AQI
2025*	91	77	13	1	0	23	119
2024	106	101	5	0	0	17	64
2023	118	109	8	1	0	20	128
2022	117	103	14	0	0	18	96
2021	119	103	16	0	0	21	76
2020	318	284	25	9	9	22	1358
2019	365	300	65	0	0	27	97
2018	257	199	53	5	1	26	159
2017	119	105	11	3	1	21	152
2016	122	113	9	0	0	19	63
2015	120	107	12	1	0	21	108
2014	118	113	5	0	0	21	76
2013	118	108	10	0	0	18	70
2012	304	264	40	0	0	23	82
2011	175	141	34	0	0	25	91
2010	122	111	11	0	0	22	66

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

Washington 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.