Lake Forest, 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.
Lake Forest, IL air quality summary: Lake Forest, IL, holds a Clean Air Score of 76.9 and a grade of B. The annual PM2.5 mean is 7.2, reflecting a moderate level of long-term particulate exposure. Lake Forest has an annual PM2.5 mean of 7.2, which is considered moderate for long-term exposure. Long-term air quality in Lake Forest has been improving over recent years.
Clean Air Score
The Clean Air Score of 76.9 and grade of B signify that Lake Forest generally maintains stable air quality. These values indicate that fine particulate levels are typically kept within acceptable environmental ranges over the long term.
🏡 What This Means for Buying
Potential residents should view Lake Forest's air quality as a consistent environmental factor. Air quality should be treated as one factor in a broader relocation or housing decision.
Indoor Air Quality in Lake Forest, 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 Lake Forest.
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 Lake Forest:
- 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 Lake Forest Homes:
🩺 My Health Risk Assessment
See how Lake Forest'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, Lake Forest's air quality improved by 1.2 μg/m³. Based on NBER studies, this change correlates with a estimated 4.8% increase in relative property value retention.
Cleaner Alternatives in IL
Why Lake Forest earned a 76.9
Raw inputs, scoring weights, and data coverage for this city.
Best Time to Run
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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% | 69.2 |
| Unhealthy Days | 25% | 100 |
| 5-Year Trend | 20% | 56 |
| Seasonal Variability | 10% | 92.1 |
| 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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Lake Forest Air Quality FAQs
Is Lake Forest a good fit for people who care about long-term air quality?
Lake Forest is a solid choice for those concerned with air quality, with a score of 76.9 and a grade of B. The annual PM2.5 mean of 7.2 indicates a moderate level of long-term exposure.
What is the frequency of unhealthy air or long-term pollution exposure in Lake Forest?
Lake Forest records an unhealthy days percentage of 0, supporting its B grade. This indicates that while particulates are present, residents are not frequently exposed to dangerous pollution spikes.
Is air quality in Lake Forest improving or getting worse over time?
The air quality in Lake Forest is currently showing an improving trend. Long-term particulate levels have been decreasing over recent years.
Does air quality vary within different parts of Lake Forest?
Air quality can vary within the city due to local traffic, industry, and location patterns. Proximity to major roads or local industrial activity can lead to minor variations in particulate levels.