Bethlehem, PA
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.
Bethlehem, PA air quality summary: Bethlehem, PA, maintains a clean air score of 80 and a B grade, with an annual PM2.5 mean of 6.6. These ratings indicate a stable and generally favorable air quality environment for the local community. In Bethlehem, the annual PM2.5 mean is 6.6, which is considered moderate or acceptable but still relevant for long-term exposure. Long-term air quality in Bethlehem has been improving over recent years.
Clean Air Score
The clean air score of 80 and B grade reflect long-term particulate levels that are well within acceptable national standards. This suggests that Bethlehem consistently provides a quality air environment for its residents.
🏡 What This Means for Buying
Air quality is a relevant factor to include in a comprehensive housing or relocation assessment in Bethlehem. A B grade indicates that environmental conditions are a stable and positive aspect of the city's living profile.
Indoor Air Quality in Bethlehem, PA
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 Bethlehem.
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 Bethlehem:
- 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.
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🩺 My Health Risk Assessment
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Health Advice
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Between 2019 and 2024, Bethlehem's air quality improved by 1.3 μg/m³. Based on NBER studies, this change correlates with a estimated 5.2% increase in relative property value retention.
Cleaner Alternatives in PA
Why Bethlehem earned a 80
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% | 76.5 |
| Unhealthy Days | 25% | 100 |
| 5-Year Trend | 20% | 56.5 |
| Seasonal Variability | 10% | 93.7 |
| 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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Bethlehem Air Quality FAQs
Is Bethlehem a good fit for people who care about long-term air quality?
Bethlehem holds a clean air score of 80 and a B grade, with an annual PM2.5 mean of 6.6. These figures suggest a favorable environment for individuals Focused on long-term air quality.
What is the frequency of unhealthy air or long-term pollution exposure in Bethlehem?
Bethlehem reports 0% unhealthy air days according to available records. Its B grade and 6.6 PM2.5 mean further indicate that acute pollution spikes are rare in the city.
Is air quality in Bethlehem improving or getting worse over time?
Air quality in Bethlehem has shown an improving trend over recent years. This reflects a positive shift in long-term particulate concentrations for the area.
Does air quality vary within the city of Bethlehem?
Air quality can vary within Bethlehem due to factors such as local traffic patterns, industrial presence, and geography. While the overall grade is positive, localized conditions near specific particulate sources may differ.