Air Quality Rankings for Kentucky 2026

Kentucky has 27 cities with EPA air quality data. Morgan, Kentucky has the cleanest air with a 5-year average AQI of 35. Jefferson, Kentucky has the highest AQI at 54.

#	City	5yr Avg AQI	Current AQI	Worst Pollutant	Trend	Grade
1	Morgan, Kentucky	35	38	Ozone	Stable	B
2	Greenup, Kentucky	36	39	Ozone	Stable	B
3	Trigg, Kentucky	36	39	Ozone	Stable	B
4	Carter, Kentucky	37	40	Ozone	Stable	B
5	Washington, Kentucky	37	40	Ozone	Stable	B
6	Edmonson, Kentucky	38	39	Ozone	Stable	B
7	Simpson, Kentucky	39	43	Ozone	Stable	B
8	Pike, Kentucky	39	39	PM2.5	Improving	B
9	Boone, Kentucky	40	44	Ozone	Worsening	C
10	Bullitt, Kentucky	40	44	Ozone	Stable	C
11	Hancock, Kentucky	40	42	Ozone	Stable	B
12	Livingston, Kentucky	40	42	Ozone	Stable	B
13	Jessamine, Kentucky	40	43	Ozone	Stable	B
14	Oldham, Kentucky	40	42	Ozone	Stable	B
15	Pulaski, Kentucky	42	45	Ozone	Worsening	C
16	Boyd, Kentucky	44	46	PM2.5	Improving	B
17	Campbell, Kentucky	44	44	PM2.5	Improving	B
18	Perry, Kentucky	44	45	PM2.5	Improving	B
19	Hardin, Kentucky	44	45	PM2.5	Improving	B
20	Warren, Kentucky	44	44	PM2.5	Stable	C
21	Bell, Kentucky	45	49	Ozone	Worsening	C
22	Fayette, Kentucky	45	45	PM2.5	Stable	C
23	Christian, Kentucky	45	47	Ozone	Worsening	C
24	McCracken, Kentucky	46	47	PM2.5	Improving	C
25	Daviess, Kentucky	47	51	PM2.5	Stable	C
26	Henderson, Kentucky	53	53	PM2.5	Worsening	D
27	Jefferson, Kentucky	54	55	PM2.5	Stable	C

Air quality data for Kentucky is sourced from the EPA Air Quality System (AQS), which monitors outdoor air quality at thousands of stations nationwide.
— EPA Air Quality System

Frequently Asked Questions

Morgan, Kentucky has the best air quality in Kentucky with a 5-year average AQI of 35 and a grade of B.

Kentucky has 27 cities with EPA air quality monitoring data in our database, covering multiple years of AQI measurements.

The Air Quality Index (AQI) measures five major pollutants: ground-level ozone, particulate matter (PM2.5 and PM10), carbon monoxide, sulfur dioxide, and nitrogen dioxide. Lower AQI values indicate cleaner air — 0-50 is "Good," while 150+ is "Unhealthy."

Sources: EPA Air Quality System (AQS)

Cities ranked by 5-year average AQI (lower is better). Grades factor in average AQI, trend direction, unhealthy days, and dominant pollutant.

Cleanest Cities Nationwide →All Air Quality in Kentucky →