Bad Air Days in Whitley County, Indiana: 1 a Year

1 bad air day a year

Fewer bad air days than most monitored US counties. Ranked 676 of 996 monitored counties, where 1 is worst.

What makes them bad: mostly particles: smoke and dust (100% particle days).

Which months to watch

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

What actually helps 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 worst days on file

The worst recent year was 2023, with 7 bad days on 363 monitored days.

Date	AQI	Main pollutant
2023-06-27	223	PM2.5
2023-06-28	198	PM2.5
2023-06-29	159	PM2.5
2023-07-16	149	PM2.5
2023-07-17	133	PM2.5

An ordinary day in Whitley

Across 3,555 monitored days from 2016 to 2025, the air in Whitley County rated Good on 62% of them, less often than the 72% typical of monitored counties, and Moderate on 38%. The median day sat at AQI 43; one day in ten went above 61.

The pollutant setting the AQI on an ordinary day here:

fine particles (PM2.5)100%3,543 days

Whitley County by year

Year	Days monitored	Good	Moderate	Over 100	Over 150	Median AQI	Highest AQI
2025*	363	233	128	2	0	39	108
2024	366	278	88	0	0	35	70
2023	363	195	161	7	3	48	223
2022	360	221	138	1	0	44	109
2021	361	203	158	0	0	47	96
2020	336	160	176	0	0	51	79
2019	352	213	139	0	0	43	91
2018	348	235	113	0	0	41	84
2017	350	223	127	0	0	44	87
2016	356	240	116	0	0	40	79
2015	359	170	189	0	0	51	89
2014	356	173	181	2	0	51	125
2013	360	130	229	1	0	54	104
2012	307	179	127	1	0	44	106
2011	348	142	206	0	0	53	89
2010	249	125	123	1	0	50	102

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

Indiana 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.