Bad Air Days in Warrick County, Indiana: 3 a Year

3 bad air days a year

About the middle of monitored US counties. Ranked 434 of 996 monitored counties, where 1 is worst.

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

The bad-air season here

Most bad days here fall in 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

In 2000 to 2009 this county averaged 39 bad days a year; in 2016 to 2025, 3. The air has improved. The worst recent year was 2016, with 5 bad days on 183 monitored days.

Date	AQI	Main pollutant
2016-06-25	151	Ozone
2016-06-10	136	Ozone
2023-06-28	133	Ozone
2018-07-13	126	Ozone
2023-06-06	122	Ozone

An ordinary day in Warrick

Across 3,350 monitored days from 2016 to 2025, the air in Warrick County rated Good on 89% of them, more often than the 72% typical of monitored counties, and Moderate on 11%. The median day sat at AQI 37; one day in ten went above 53.

The pollutant setting the AQI on an ordinary day here:

ozone100%3,350 days

Every recent year on file

Year	Days monitored	Good	Moderate	Over 100	Over 150	Median AQI	Highest AQI
2025*	365	319	46	0	0	37	97
2024	366	326	39	1	0	38	101
2023	365	311	47	7	0	38	133
2022	365	326	38	1	0	37	101
2021	365	337	27	1	0	35	105
2020	366	347	17	2	0	33	112
2019	365	337	28	0	0	36	93
2018	365	324	38	3	0	35	126
2017	245	212	30	3	0	42	112
2016	183	136	42	5	1	42	151
2015	183	143	38	2	0	42	115
2014	183	140	41	2	0	44	105
2013	183	146	37	0	0	44	97
2012	183	97	62	24	2	49	159
2011	183	127	47	9	1	46	159
2010	183	110	67	6	0	48	122

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