Normal, 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.
Normal, IL air quality summary: Normal, IL maintains a Clean Air Score of 81.2 and carries a long-term air quality grade of B. The city's annual mean PM2.5 concentration is measured at 6.4 micrograms per cubic meter. Normal recorded an annual mean PM2.5 concentration of 6.4 micrograms per cubic meter. Long-term air quality in the area has been improving over recent years.
Clean Air Score
The score of 81.2 and grade of B reflect the city's overall performance in managing particulate matter over multiple years. This evaluation provides a baseline for understanding the long-term atmospheric conditions in Normal.
🏡 What This Means for Buying
Air quality should be treated as one factor in a broader relocation or housing decision. Prospective residents may use these metrics to understand the typical multi-year exposure environment.
Indoor Air Quality in Normal, 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 Normal.
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 Normal:
- 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 Normal Homes:
🩺 My Health Risk Assessment
See how Normal'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, Normal's air quality improved by 2.6 μg/m³. Based on NBER studies, this change correlates with a estimated 10.4% increase in relative property value retention.
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Why Normal earned a 81.2
Raw inputs, scoring weights, and data coverage for this city.
Best Time to Run
Find the cleanest hours for your run today.
Cycling Forecast
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📅 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% | 79.5 |
| Unhealthy Days | 25% | 100 |
| 5-Year Trend | 20% | 63 |
| Seasonal Variability | 10% | 94.4 |
| 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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Normal Air Quality FAQs
Is Normal a good fit for people who care about long-term air quality?
Normal has a Clean Air Score of 81.2 and a grade of B, indicating its general suitability based on historical data. The annual mean PM2.5 level of 6.4 reflects moderate or acceptable but still relevant for long-term exposure.
What is the frequency of unhealthy air or long-term pollution exposure in Normal?
The percentage of unhealthy air days in Normal is 0 percent. This contributes to the city's overall grade of B and its recorded annual mean PM2.5 of 6.4.
Is air quality in Normal improving or getting worse over time?
Air quality in Normal is currently described as improving over the monitored period.
Does air quality vary across different neighborhoods in Normal?
Air quality can vary between different areas of the city; please refer to neighborhood or ZIP-level details for more specific local information.