Worst air pollution Downtown Chattanooga - Chattanooga, today and tomorrow
Today (20 September): Air quality in Downtown Chattanooga is moderate. AQI and PM10 are moderate; PM2.5 and NO2 are fair; O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 8:00 AM (PM10: 44.9/100).
Tomorrow (21 September 2026): Air quality in Downtown Chattanooga is fair. AQI improves to fair; PM2.5 decreases to good; PM10 decreases to fair; O3 increases to fair; all other pollutants stay as today. Pollution peaks around 7:00 PM (NO2: 26.0/100). Airmine updates local air quality forecasts four times daily.
Get the full experience in the Airmine app.
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
Follow your pollen exposure and performance with the free Airmine–Strava integration. See your pollen and air quality exposure for every Strava activity.
Chattanooga's Downtown air quality reflects the Tennessee River valley's topographic enclosure between Lookout and Signal mountains, with vehicle traffic on the surrounding Market Street and Broad Street corridors generating local sources. The river valley's ridgeline enclosure concentrates emissions under inversions, while the Tennessee Aquarium and Riverpark provide limited local buffering and downtown generally maintains moderate to elevated Chattanooga metropolitan readings throughout most of the year.
Today - 20 September | Pollution peaks at 08:00
AQI:
Moderate
44.9/100
PM2.5 (fine particles):
Fair
20.9/100
PM10 (coarse particles):
Moderate
44.9/100
NO2 (nitrogen dioxide):
Fair
20.8/100
O3 (ozone):
Good
16.9/100
SO2 (sulfur dioxide):
Good
2.2/100
CO (carbon monoxide):
Good
0.6/100
HCHO (formaldehyde):
Good
2.3/100
PM1 (ultrafine particles):
Good
3.0/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 19:00
AQI:
Fair
26.0/100
PM2.5 (fine particles):
Good
16.1/100
PM10 (coarse particles):
Fair
22.0/100
NO2 (nitrogen dioxide):
Fair
26.0/100
O3 (ozone):
Fair
21.5/100
SO2 (sulfur dioxide):
Good
1.7/100
CO (carbon monoxide):
Good
0.6/100
HCHO (formaldehyde):
Good
2.4/100
PM1 (ultrafine particles):
Good
3.6/100
Other Landmarks in Chattanooga
Sports venues in Chattanooga
Frequently Asked Questions
Is air quality bad in Downtown Chattanooga right now?
On 20 September 2026, overall air quality in Downtown Chattanooga is moderate. AQI is the main air quality indicator at 44.9/100. Pollution peaks around 8:00 AM (PM10: 44.9/100).
Will air quality be worse tomorrow in Downtown Chattanooga?
On 21 September 2026, air quality conditions in Downtown Chattanooga will be better than today, with AQI forecast at fair at 26.0/100. Pollution peaks around 7:00 PM (NO2: 26.0/100).
When is air pollution at its worst in Downtown Chattanooga?
Downtown Chattanooga's air quality follows a clear seasonal pattern. In short, winter is typically the cleanest season, with mild temperatures and fewer stagnant air episodes, whereas 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 Downtown Chattanooga 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.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
Want to see air quality forecasts for other cities in United States?
Check air quality in other popular cities:
Data provided by Airmine — Last update: 20 September 2026 at 20:27 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.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
Some text on this page may be generated or summarised using artificial intelligence (AI). Wherever possible, AI-generated content is enriched with Airmine's proprietary data to improve its accuracy and relevance. However, AI-generated content may still contain errors, omissions, or inaccuracies.
Get the full experience in the Airmine app.