Bad Air Days in Huntington County, Indiana: under 1 a Year

under 1 bad air days a year

Rare: among the cleanest-air counties EPA monitors. Ranked 878 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 Huntington

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

What to buy, and what not to

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.

Better or worse than it was

The worst recent year was 2016, with 1 bad day on 180 monitored days.

Date	AQI	Main pollutant
2016-05-24	105	Ozone
2017-06-10	100	Ozone
2018-05-28	97	Ozone
2016-04-18	93	Ozone
2018-05-25	93	Ozone

The air on a normal day

Across 1,138 monitored days from 2016 to 2019, the air in Huntington County rated Good on 94% of them, more often than the 72% typical of monitored counties, and Moderate on 6%. The median day sat at AQI 34; one day in ten went above 49.

The pollutant setting the AQI on an ordinary day here:

ozone100%1,138 days

Year by year

Year	Days monitored	Good	Moderate	Over 100	Median AQI	Highest AQI
2019	355	345	10	0	31	84
2018	358	337	21	0	31	97
2017	245	227	18	0	39	100
2016	180	156	23	1	37	105
2015	178	175	3	0	31	71
2014	176	168	8	0	35	80
2013	183	177	6	0	36	77
2012	180	140	38	2	42	126
2011	183	151	30	2	43	115
2010	182	159	23	0	41	90

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.