Chicago, IL Air Quality
Report & Trends
Analysis & History
The Verdict
Compared to other metro areas, Chicago, IL scores poorly.
You are most likely to need an air purifier in July, when historical averages peak.
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.
With a median PM2.5 score of 60, Chicago, IL residents frequently face "Moderate" to "Unhealthy" air days. 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.
Calculate Your Wildfire Defense
Don't guess. Enter your room size to see exactly which machine clears smoke in 15 minutes.
Coway AP-1512HH
The industry standard. Perfect for living rooms.
Wildfire smoke is 2.5 microns wide—too small for normal filters. Using an undersized purifier is dangerous false security.
Common Questions
When is the worst time for air quality in Chicago, IL?
Based on 10 years of data, the worst months for air quality in Chicago, IL are: July (AQI 72.8), August (AQI 72.2), June (AQI 71.7). 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 Chicago, IL given the air quality?
Yes, but with caveats. Chicago, IL 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 Chicago, IL improving?
Yes. Our 10-year analysis shows a positive trend. Despite regional wildfire challenges, average particulate levels in Chicago, IL have decreased, likely due to favorable weather patterns and reduced local emissions.
Do I really need an air purifier in Chicago, IL?
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 Chicago, IL 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 Chicago, IL 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
As the climate shifts, so does our definition of "Good" air. Chicago, IL is on the front lines of this change.