Marion, IL
Long-term air quality
What this page tells you
This page combines annual PM2.5, unhealthy days, 5-year trend, and data coverage so you can compare long-term air quality, not just today's reading.
Marion, IL air quality summary: Marion, IL has a clean air score of 78.5 and a grade of B, with an annual PM2.5 mean of 6.9. These metrics indicate moderate and acceptable long-term air quality for residents. In Marion, the annual PM2.5 mean of 6.9 represents moderate but acceptable levels for long-term exposure. Long-term air quality in Marion has been improving over recent years.
Clean Air Score
The clean air score of 78.5 and B grade reflect air quality levels that are generally favorable for long-term living. These scores are based on historical trends in fine particulate concentrations.
🏡 What This Means for Buying
Prospective residents should treat air quality as one factor in a comprehensive evaluation of Marion. The B grade indicates a stable and acceptable environmental profile.
Indoor Air Quality in Marion, IL
Outdoor pollution can still affect indoor air when windows are open, filtration is weak, or wildfire smoke moves in.
How to react when today's AQI changes
Use the AQI bands below to decide whether to open windows, run an air purifier, or stay indoors when pollution spikes in Marion.
AQI 0-50
GoodOpen windows: Open windows if you want fresh air.
Air purifier: No purifier needed for most homes.
Indoor activity: Normal indoor activity is fine.
AQI 51-100
ModerateOpen windows: Sensitive groups should limit open-window time.
Air purifier: Use fans or filtration if dust or pollen is bothering you.
Indoor activity: Most people can stay active indoors.
AQI 101-150
Unhealthy for Sensitive GroupsOpen windows: Keep windows closed.
Air purifier: Run a HEPA purifier in the main room and bedroom.
Indoor activity: Sensitive groups should reduce outdoor exposure.
AQI 151+
UnhealthyOpen windows: Keep windows and doors closed.
Air purifier: Run HEPA continuously and seal obvious drafts.
Indoor activity: Stay indoors as much as possible; use an N95 if you must go out.
Common indoor air concerns in Marion:
- Seasonal pollen and dust mite allergens
- VOCs from household products
Recommended action: If today's AQI reaches 101 or higher, close windows and run HEPA filtration before indoor air starts to feel smoky or stale.
Top Products for Marion Homes:
🩺 My Health Risk Assessment
See how Marion's air quality affects you and your family specifically.
Health Advice
Enjoy the outdoors! Air quality is great.
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</> Create Free Widget🏡 Property Value Impact Analysis
Between 2019 and 2024, Marion's air quality improved by 2 μg/m³. Based on NBER studies, this change correlates with a estimated 8% increase in relative property value retention.
Cleaner Alternatives in KY
Why Marion earned a 78.5
Raw inputs, scoring weights, and data coverage for this city.
Best Time to Run
Find the cleanest hours for your run today.
Cycling Forecast
Avoid pollution spikes on your next ride.
📅 Past 30 Days Trend
Real-time daily PM2.5 AQI
🌸 Pollen Outlook
Current Seasonal Forecast
How it worksBased on current seasonal forecast data. Not a long-term pollution rating or relocation score.
Score Breakdown
| Component | Weight | Score Contribution |
|---|---|---|
| Annual Air Quality | 40% | 72.8 |
| Unhealthy Days | 25% | 100 |
| 5-Year Trend | 20% | 60 |
| Seasonal Variability | 10% | 93.8 |
| Extreme Events | 5% | 100 |
Explore More Air Quality Data
Frequently Asked Questions
About This Data
Data Sources
Historical air quality mapping and scoring are based completely on official U.S. Environmental Protection Agency (EPA) AirNow API data. 5-day AQI forecasts are provided by WAQI.
Methodology
Our Clean Air Score (0-100) is a proprietary algorithm that weighs multiple factors:
- Annual PM2.5 averages (40%)
- Frequency of unhealthy days (25%)
- 5-year pollution trends (20%)
- Seasonal variability and extreme events (15%)
Updates & Accuracy
Real-time data is updated hourly. Historical aggregate scores are recalculated monthly to reflect the latest trends. While we strive for accuracy, sensor maintenance and local conditions can affect individual readings.
Practical Advice
When AQI > 100: Sensitive groups (children, elderly, asthmatics) should limit prolonged outdoor exertion.
When AQI > 150: Everyone should avoid outdoor exercise and keep windows closed.
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Marion Air Quality FAQs
Is Marion a good fit for people who care about long-term air quality?
Marion, IL maintains a clean air score of 78.5 and a grade of B, suggesting favorable conditions. The annual PM2.5 mean of 6.9 reflects moderate and acceptable particulate levels.
How often does Marion experience unhealthy air frequency?
Marion has an unhealthy days percentage of 0 and an annual PM2.5 mean of 6.9. These metrics support its B grade and indicate very few instances of elevated pollution exposure.
Is the air quality in Marion improving or worsening over time?
Air quality in Marion is improving over recent years. The trend direction indicates a positive shift in long-term particulate pollution levels.
How does air quality vary within Marion?
Air quality can vary within the city due to local traffic, industry, and location patterns. Specific localized sources may influence the air quality in different neighborhoods.