St. Louis Fall AQI: Air Quality Guide
Learn about fall air quality patterns in St. Louis and how to stay safe during this season.
Current Air Quality
Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution.
Seasonal Patterns
Fall air quality in St. Louis is influenced by weather patterns, temperature inversions, and seasonal activities. Check our seasonal guides for more information.
View Current Air Quality →PM2.5 Levels
Fine particulate matter data →
Ozone Levels
Ground-level ozone data →
Seasonal Guides
Air quality by season →
Health Effects
Learn about air pollution impacts →
Frequently Asked Questions About St. Louis Air Quality
What is the current air quality in St. Louis?
The current Air Quality Index (AQI) in St. Louis, MO is 56, which is considered moderate.
Is it safe to exercise outdoors in St. Louis?
Generally yes. With an AQI of 56, outdoor exercise is acceptable for most people. Sensitive individuals should monitor symptoms.
When is the best time of year to visit St. Louis for good air quality?
Spring and early fall typically offer the best air quality in St. Louis. Summer months may have elevated ozone levels, while winter can see higher PM2.5 from temperature inversions.
What causes air pollution in St. Louis?
Air pollution in St. Louis can come from vehicle emissions, industrial activity, construction, wildfires, and weather patterns. Local geography and seasonal factors also play a significant role.