Bethesda, MD
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.
Bethesda, MD air quality summary: Bethesda, MD, holds a clean air score of 88.9 and an A grade, with an annual PM2.5 mean of 4.5. These metrics indicate an excellent long-term air quality profile for the community. In Bethesda, the annual PM2.5 mean is 4.5, which is considered relatively low long-term particulate exposure. Long-term air quality in Bethesda has been improving over recent years.
Clean Air Score
The clean air score of 88.9 and A grade signify that Bethesda maintains very high air quality standards. These ratings reflect long-term particulate levels that are well within ranges considered optimal for residential environments.
🏡 What This Means for Buying
Air quality is a strong positive factor to consider when evaluating long-term housing or relocation in Bethesda. An A grade suggests that the local environment is a high-quality aspect of the community.
Indoor Air Quality in Bethesda, MD
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 Bethesda.
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 Bethesda:
- 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 Bethesda Homes:
🩺 My Health Risk Assessment
See how Bethesda's air quality affects you and your family specifically.
Health Advice
Enjoy the outdoors! Air quality is great.
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Between 2019 and 2024, Bethesda'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 MD
No cleaner cities found in this state. Bethesda is already a top performer!
Why Bethesda earned a 88.9
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% | 100 |
| Unhealthy Days | 25% | 100 |
| 5-Year Trend | 20% | 59.5 |
| Seasonal Variability | 10% | 89.4 |
| 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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Bethesda Air Quality FAQs
Is Bethesda a good fit for people who care about long-term air quality?
Bethesda holds a clean air score of 88.9 and an A grade, with an annual PM2.5 mean of 4.5. These metrics suggest an excellent environment for individuals who prioritize high air quality.
What is the frequency of unhealthy air or long-term pollution exposure in Bethesda?
Bethesda reports 0% unhealthy air days according to current records. This, combined with its A grade and low PM2.5 mean, indicates a very low risk of significant particulate exposure.
Is air quality in Bethesda improving or getting worse over time?
The trend for air quality in Bethesda has been improving over recent years. This reflects a positive shift in particulate levels for the community.
Does air quality vary within the area of Bethesda?
Air quality can vary within Bethesda due to localized factors such as traffic density and proximity to commercial zones. While the overall grade is excellent, specific areas may experience slight variations in particulate levels.