Bad Air Days in Fayette County, Ohio: under 1 a Year

under 1 bad air days a year

Rare: among the cleanest-air counties EPA monitors. Ranked 876 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 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 record for Fayette

In 2000 to 2009 this county averaged 16 bad days a year; in 2016 to 2025, under 1. The air has improved. The worst recent year was 2016, with 1 bad day on 353 monitored days.

Date	AQI	Main pollutant
2017-06-04	115	Ozone
2016-06-11	108	Ozone
2017-06-03	100	Ozone
2016-04-18	97	Ozone
2017-06-21	93	Ozone

The air on a normal day

Across 2,258 monitored days from 2016 to 2022, the air in Fayette County rated Good on 92% of them, more often than the 72% typical of monitored counties, and Moderate on 7%. The median day sat at AQI 36; one day in ten went above 49.

The pollutant setting the AQI on an ordinary day here:

ozone100%2,258 days

Every recent year on file

Year	Days monitored	Good	Moderate	Over 100	Over 150	Median AQI	Highest AQI
2022	128	126	2	0	0	35	64
2021	360	339	21	0	0	36	90
2020	341	318	23	0	0	35	80
2019	355	332	23	0	0	38	74
2018	364	337	27	0	0	35	80
2017	357	326	30	1	0	35	115
2016	353	310	42	1	0	37	108
2015	327	294	30	3	0	37	115
2014	346	314	30	2	0	37	122
2013	332	304	26	2	0	35	108
2012	350	265	75	10	1	38	200
2011	340	280	51	9	0	37	140
2010	352	277	70	5	0	40	129

Ohio 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.