Bad Air Days in Trigg County, Kentucky: 0 a Year

0 bad air days a year

Rare: among the cleanest-air counties EPA monitors. Ranked 964 of 996 monitored counties, where 1 is worst.

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

In 2000 to 2009 this county averaged 16 bad days a year; in 2016 to 2025, 0. The air has improved.

Date	AQI	Main pollutant
2017-05-09	87	Ozone
2018-05-11	87	Ozone
2019-09-16	87	Ozone
2020-06-07	84	Ozone
2016-06-09	80	Ozone

The air on a normal day

Across 2,218 monitored days from 2016 to 2022, the air in Trigg 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 36; one day in ten went above 48.

The pollutant setting the AQI on an ordinary day here:

ozone100%2,218 days

Every recent year on file

Year	Days monitored	Good	Moderate	Over 100	Over 150	Median AQI	Highest AQI
2022	126	116	10	0	0	39	80
2021	345	330	15	0	0	35	74
2020	362	350	12	0	0	34	84
2019	353	328	25	0	0	37	87
2018	348	324	24	0	0	35	87
2017	327	309	18	0	0	37	87
2016	357	319	38	0	0	36	80
2015	344	318	26	0	0	36	71
2014	347	311	35	1	0	36	101
2013	336	314	21	1	0	36	115
2012	337	263	63	11	1	40	159
2011	351	274	76	1	0	41	112
2010	364	225	132	7	0	45	147

Kentucky 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.