St. Louis, MO Air Quality
Report & Trends
Analysis & History
The Verdict
St. Louis, MO is currently ranked #210 out of 224 cities tracked.
Plan your outdoor activities carefully in June, the statistical peak for AQI spikes in MO.
Health Recommendation
Sensitive groups should consider monitoring daily forecast apps significantly closer.
10-Year Annual PM2.5 Average
Analysis: Annual average Median AQI from 2015 to 2025.
Our 10-year analysis of St. Louis, MO reveals a distinct pattern in particle pollution exposure. Since 2015, particle pollution days have trended downward, signaling a positive shift in local air hygiene.
Seasonal Risk Calendar
The "Smoke Season" Calendar
Values represent historical Average Monthly AQI (PM2.5). Higher is worse.
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Common Questions
When is the worst time for air quality in St. Louis, MO?
Based on 10 years of data, the worst months for air quality in St. Louis, MO are: June (AQI 73.2), October (AQI 71.7), August (AQI 66.7). These months typically see the highest concentrations of PM2.5 due to fine particulate matter trapped by local geography.
Is it safe to move to St. Louis, MO given the air quality?
Yes, but with caveats. St. Louis, MO offers an incredible quality of life, but new residents should be aware of the "pollution season." Most homes in the area need robust air filtration systems to maintain safe indoor levels during these few weeks a year.
Is the air quality in St. Louis, MO improving?
Yes. Our 10-year analysis shows a positive trend. Despite regional wildfire challenges, average particulate levels in St. Louis, MO have decreased, likely due to favorable weather patterns and reduced local emissions.
Do I really need an air purifier in St. Louis, MO?
Based on the 10-year analysis, absolutely. The levels of PM2.5 recorded during peak events are unsafe for indoor occupation without filtration. A CADR-rated purifier is considered essential appliance for St. Louis, MO households.
How accurate is this data?
This report is built on official EPA Air Quality System (AQS) data. We aggregated daily summary files from 2014 to present to build these charts. Unlike real-time apps that estimate, this is the verified historical record.
Is St. Louis, MO safe from other disasters?
Air quality is just one factor. Check our sister site for a complete analysis of tornado, hurricane, and flood risks.
Full Safety Report →Summary
Ignoring these trends won't make the particle pollution go away. Smart filtration is the best insurance policy for St. Louis, MO homeowners.