SmogRank / World / United States / Kentucky / December 2025
Most polluted cities in Kentucky, United States, December 2025
17 cities in Kentucky, United States ranked by their average PM2.5 over the 31 days. Worst: Louisville at 10.9 µg/m³, #1,141 of 2,960 cities in the world. Cleanest: Pikeville at 5.8. A city needs measurements on 70% of the days to be ranked.
Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.
- 1Louisville 0%
- 2Flatwoods 0%
- 3Valley Station 0%
- 4Owensboro 0%
- 4Saint Matthews 0%
- 6Middlesboro 0%
- 7Jeffersontown 0%
- 8Paducah 0%
- 8Elizabethtown 0%
- 10Ashland 0%
- 11Lexington-Fayette 0%
- 12Nicholasville 0%
- 13Somerset 0%
- 14Highland Heights 0%
- 15Oak Grove 0%
- 16Hazard 0%
- 17Pikeville 0%
The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales
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SmogRank, most polluted cities in Kentucky, United States, PM2.5, December 2025, smogrank.com/us/region/kentucky/history/2025-12 (accessed 6 Oct 2026).
You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.