Medford, MA
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.
Medford, MA air quality summary: Medford, MA, maintains a clean air score of 83.2 and an air quality grade of B. The city's annual PM2.5 mean is 6 micrograms per cubic meter. Medford has a PM2.5 annual mean of 6, which represents a moderate and acceptable level for long-term particulate exposure. Long-term air quality in Medford has been improving over recent years.
Clean Air Score
The score of 83.2 and B grade indicate that Medford generally experiences favorable long-term air quality. These values suggest that particulate pollution typically stays within acceptable ranges for the area.
🏡 What This Means for Buying
Prospective residents should view air quality as a positive component of the local environment in Medford. The B grade provides a reliable indicator of typical long-term atmospheric conditions.
Indoor Air Quality in Medford, MA
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 Medford.
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 Medford:
- 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 Medford Homes:
🩺 My Health Risk Assessment
See how Medford'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 2020 and 2024, Medford's air quality improved by 3.5 μg/m³. Based on NBER studies, this change correlates with a estimated 14% increase in relative property value retention.
Cleaner Alternatives in MA
Why Medford earned a 83.2
Raw inputs, scoring weights, and data coverage for this city.
Best Time to Run
Find the cleanest hours for your run today.
Cycling Forecast
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% | 85 |
| Unhealthy Days | 25% | 100 |
| 5-Year Trend | 20% | 67.5 |
| Seasonal Variability | 10% | 92 |
| 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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Medford Air Quality FAQs
Is Medford a good fit for people who care about long-term air quality?
Medford is a good choice for those concerned with air quality, as shown by its score of 83.2 and grade of B. The PM2.5 annual mean of 6 is considered favorable for an urban area near Boston.
How frequent is unhealthy air in Medford?
Medford records an unhealthy air day frequency of 0%, which aligns with its overall grade of B. This indicates that residents almost never encounter acute spikes in particulate pollution.
Is air quality in Medford improving or getting worse over time?
Long-term air quality in Medford has been improving over recent years. This positive trend indicates a gradual decrease in typical particulate concentrations for the community.
Does air quality vary across different parts of Medford?
Air quality can vary within Medford due to local traffic, industry, and location patterns. Localized factors like proximity to major highways can affect the specific air quality at any given address.