Worst air pollution St. Elmo - Chattanooga, today and tomorrow
Today (16 July): Air quality in St. Elmo is fair. AQI, PM2.5, PM10, NO2, and O3 are fair; SO2, CO, HCHO, and PM1 are good. Pollution peaks around 3:00 PM (PM10: 34.5/100).
Tomorrow (17 July 2026): Air quality in St. Elmo is fair. PM1 increases to fair; all other pollutants stay as today. Pollution peaks around 11:00 PM (NO2: 34.0/100). Airmine updates local air quality forecasts four times daily.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Chattanooga's St. Elmo air quality reflects the historic neighbourhood at the base of Lookout Mountain, with vehicle traffic on the surrounding St. Elmo Avenue corridor contributing local sources. The Lookout Mountain escarpment creates dramatic topographic variation, while the neighbourhood's unique position at the mountain base provides some cleaner downslope airflows and St. Elmo generally maintains moderate Chattanooga metropolitan readings throughout most of the year.
Today - 16 July | Pollution peaks at 15:00
AQI:
Fair
34.5/100
PM2.5 (fine particles):
Fair
23.5/100
PM10 (coarse particles):
Fair
34.5/100
NO2 (nitrogen dioxide):
Fair
32.6/100
O3 (ozone):
Fair
32.1/100
SO2 (sulfur dioxide):
Good
8.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.4/100
PM1 (ultrafine particles):
Good
18.3/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 23:00
AQI:
Fair
34.0/100
PM2.5 (fine particles):
Fair
31.2/100
PM10 (coarse particles):
Fair
25.3/100
NO2 (nitrogen dioxide):
Fair
34.0/100
O3 (ozone):
Fair
30.8/100
SO2 (sulfur dioxide):
Good
7.9/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.1/100
PM1 (ultrafine particles):
Fair
29.6/100
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Frequently Asked Questions
Is air quality bad in St. Elmo right now?
On 16 July 2026, overall air quality in St. Elmo is fair. AQI is the main air quality indicator at 34.5/100. Pollution peaks around 3:00 PM (PM10: 34.5/100).
Will air quality be worse tomorrow in St. Elmo?
On 17 July 2026, air quality conditions in St. Elmo will be similar to today, with AQI forecast at fair at 34.0/100. Pollution peaks around 11:00 PM (NO2: 34.0/100).
When is air pollution at its worst in St. Elmo?
At St. Elmo, air quality tends to follow Chattanooga's broader seasonal rhythm: once summer humidity fades, winter typically offers the most consistently clean air, but 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 St. Elmo 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