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

under 1 bad air day a year

Rare: among the cleanest-air counties EPA monitors. Ranked 766 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 Jackson

Most bad days here fall in May and June. 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.

The worst days on file

The worst recent year was 2016, with 2 bad days on 183 monitored days.

Date	AQI	Main pollutant
2016-06-11	129	Ozone
2016-05-24	101	Ozone
2016-04-17	100	Ozone
2016-05-23	100	Ozone
2016-06-10	100	Ozone

The air on a normal day

Across 1,110 monitored days from 2016 to 2019, the air in Jackson County rated Good on 91% of them, more often than the 72% typical of monitored counties, and Moderate on 9%. 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%1,110 days

Year by year

Year	Days monitored	Good	Moderate	Over 100	Median AQI	Highest AQI
2019	360	340	20	0	35	80
2018	341	321	20	0	32	90
2017	226	206	20	0	40	93
2016	183	146	35	2	40	129
2015	167	141	25	1	41	101
2014	181	147	34	0	42	93
2013	183	158	24	1	43	105
2012	148	124	23	1	42	119
2011	183	154	29	0	42	100
2010	172	127	43	2	45	105

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, and on why a purifier does not touch ozone in smoke vs ozone.