Worst air pollution Louisville, today and tomorrow
Today (16 July): Air quality in Louisville is medium. AQI and O3 are medium; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 1:00 PM (O3: 40.2/100).
Tomorrow (17 July 2026): Air quality in Louisville is fair. AQI worsens to fair; O3 increases to fair; all other pollutants stay as today. Pollution peaks around 1:00 PM (O3: 38.6/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Louisville's air quality reflects the Ohio River valley's tendency to trap emissions under temperature inversions, with the surrounding Kentucky and Indiana hills limiting dispersal on calm days. Vehicle emissions from I-264 and industrial sources from the southern Indiana manufacturing corridor are the primary contributors, and the Ohio River valley inversion effect can produce persistent multi-day pollution episodes in winter.
Today - 16 July | Pollution peaks at 13:00
AQI:
Medium
40.2/100
PM2.5 (fine particles):
Good
16.1/100
PM10 (coarse particles):
Good
7.7/100
NO2 (nitrogen dioxide):
Good
0/100
O3 (ozone):
Medium
40.2/100
SO2 (sulfur dioxide):
Good
0/100
CO (carbon monoxide):
Good
0/100
HCHO (formaldehyde):
Good
1.7/100
PM1 (ultrafine particles):
Good
10.7/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 13:00
AQI:
Fair
38.6/100
PM2.5 (fine particles):
Good
14.9/100
PM10 (coarse particles):
Good
7.3/100
NO2 (nitrogen dioxide):
Good
0/100
O3 (ozone):
Fair
38.6/100
SO2 (sulfur dioxide):
Good
0/100
CO (carbon monoxide):
Good
0/100
HCHO (formaldehyde):
Good
2.1/100
PM1 (ultrafine particles):
Good
9.1/100
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Frequently Asked Questions
Is air quality bad in Louisville right now?
On 16 July 2026, overall air quality in Louisville is medium. AQI is the main air quality indicator at 40.2/100. Pollution peaks around 1:00 PM (O3: 40.2/100).
Will air quality be worse tomorrow in Louisville?
On 17 July 2026, air quality conditions in Louisville will be worse than today, with AQI forecast at fair at 38.6/100. Pollution peaks around 1:00 PM (O3: 38.6/100).
When is air pollution at its worst in Louisville?
Louisville sees air quality change through the year, as winter is typically the cleanest season, with mild temperatures and fewer stagnant air episodes; by contrast, summer heat combined with the region's dense forest cover drives an extended ozone season. Occasional agricultural or prescribed-burning smoke can add short-lived particulate spikes outside the main summer ozone season.
Are air quality levels in Louisville based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
For long term forecasts and maps, see the Airmine app