Bad Air Days in Wabash County, Indiana: 2 a Year

2 bad air days a year

Fewer bad air days than most monitored US counties. Ranked 546 of 996 monitored counties, where 1 is worst.

What makes them bad: mostly ozone: summer smog (0% particle days).

When the bad days come in Wabash

Most bad days here fall in June and May. Averaged over 2016 to 2025.

Is a purifier worth it here?

Bad air days are rare here. A standard furnace filter is enough; no purifier needed for outdoor air.
On the odd bad day, check AirNow and keep windows shut.

The record for Wabash

In 2000 to 2009 this county averaged 11 bad days a year; in 2016 to 2025, 2. The air has improved. The worst recent year was 2016, with 5 bad days on 347 monitored days.

Date	AQI	Main pollutant
2018-05-28	129	Ozone
2018-05-25	126	Ozone
2018-05-27	126	Ozone
2023-06-02	126	Ozone
2018-06-07	119	Ozone

Most days, not the worst ones

Across 3,559 monitored days from 2016 to 2025, the air in Wabash County rated Good on 90% of them, more often than the 72% typical of monitored counties, and Moderate on 10%. The median day sat at AQI 36; one day in ten went above 51.

The pollutant setting the AQI on an ordinary day here:

ozone100%3,559 days

Wabash County by year

Year	Days monitored	Good	Moderate	Over 100	Over 150	Median AQI	Highest AQI
2025*	351	323	27	1	0	34	112
2024	365	324	41	0	0	36	84
2023	364	313	48	3	0	36	126
2022	362	334	27	1	0	37	112
2021	362	327	34	1	0	35	101
2020	363	337	26	0	0	35	97
2019	351	319	32	0	0	37	97
2018	362	315	42	5	0	35	129
2017	332	302	29	1	0	35	105
2016	347	309	33	5	0	35	115
2015	358	330	26	2	0	35	126
2014	336	304	30	2	0	36	108
2013	353	309	42	2	0	35	105
2012	355	266	65	24	1	37	169
2011	336	278	51	7	0	37	129
2010	357	316	39	2	0	38	105

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

Elsewhere in Indiana

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.