Hazelwood, MO
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.
Hazelwood, MO air quality summary: Hazelwood, MO holds a Clean Air Score of 67.1 and a grade of C, with an annual PM2.5 mean of 8.9 µg/m³. This data reflects the long-term particulate exposure levels recorded in the area. Hazelwood records an annual PM2.5 mean of 8.9 µg/m³, representing moderate long-term particulate exposure. Historical data indicates that long-term air quality in Hazelwood has been improving over recent years.
Clean Air Score
The Clean Air Score of 67.1 and C grade indicate moderate long-term particulate conditions in Hazelwood. These figures focus on chronic pollution levels over several years of historical records.
🏡 What This Means for Buying
Prospective residents should consider the C grade as a factual context for evaluating long-term living in Hazelwood. Air quality is one component of a broader residential research process.
Indoor Air Quality in Hazelwood, MO
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 Hazelwood.
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 Hazelwood:
- 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 Hazelwood Homes:
🩺 My Health Risk Assessment
See how Hazelwood's air quality affects you and your family specifically.
Health Advice
Good for most outdoor activities.
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</> Create Free Widget🏡 Property Value Impact Analysis
Between 2019 and 2024, Hazelwood's air quality improved by 1.9 μg/m³. Based on NBER studies, this change correlates with a estimated 7.6% increase in relative property value retention.
Cleaner Alternatives in IL
Why Hazelwood earned a 67.1
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% | 44.8 |
| Unhealthy Days | 25% | 100 |
| 5-Year Trend | 20% | 59.5 |
| Seasonal Variability | 10% | 91.5 |
| 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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Hazelwood Air Quality FAQs
Is Hazelwood a good fit for people who care about long-term air quality?
Hazelwood, MO holds a Clean Air Score of 67.1 and a C grade, with an annual PM2.5 mean of 8.9 µg/m³. This profile reflects a moderate long-term air quality baseline for the community.
How often does Hazelwood experience unhealthy air frequency?
In Hazelwood, 0% of days recorded unhealthy air levels, which aligns with its C grade and 8.9 µg/m³ annual PM2.5 mean. This suggests that acute pollution spikes have been rare in the long-term data.
Is the air quality in Hazelwood improving or getting worse over time?
Long-term monitoring in Hazelwood suggests that air quality has been improving over recent years.
Does air quality vary within Hazelwood?
Air quality within Hazelwood can fluctuate due to local factors like traffic and industrial density, reflecting common urban environmental variations.