Franklin, 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.
Franklin, MA air quality summary: Franklin, MA holds a Clean Air Score of 84.8 and a grade of B, with an annual PM2.5 mean of 5.7 µg/m³. This data reflects the city's long-term air quality profile based on established historical records. Franklin records an annual PM2.5 mean of 5.7 µg/m³, which represents moderate long-term particulate exposure. Historical data suggests that long-term air quality in Franklin has remained neutral over recent years.
Clean Air Score
A Clean Air Score of 84.8 and B grade characterize Franklin as having moderate long-term air quality. These metrics evaluate chronic exposure to particulates over time.
🏡 What This Means for Buying
When considering Franklin for long-term residence, the B grade provides a neutral data point for atmospheric conditions. Air quality evaluation is one component of a thorough homebuying research process.
Indoor Air Quality in Franklin, 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 Franklin.
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 Franklin:
- 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 Franklin Homes:
🩺 My Health Risk Assessment
See how Franklin'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, Franklin's air quality improved by 0.3 μg/m³. Based on NBER studies, this change correlates with a estimated 1.2% increase in relative property value retention.
Cleaner Alternatives in RI
Why Franklin earned a 84.8
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% | 89.7 |
| Unhealthy Days | 25% | 100 |
| 5-Year Trend | 20% | 50 |
| Seasonal Variability | 10% | 89.5 |
| 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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Franklin Air Quality FAQs
Is Franklin a good fit for people who care about long-term air quality?
Franklin, MA has a Clean Air Score of 84.8 and a B grade, with an annual PM2.5 mean of 5.7 µg/m³. This profile suggests a moderate long-term air quality environment.
How often does Franklin experience unhealthy air frequency?
Franklin records 0% unhealthy air days, supporting its B grade and 5.7 µg/m³ annual PM2.5 mean. This suggests that high-pollution events are not common in the city's long-term record.
Is the air quality in Franklin improving or getting worse over time?
The air quality trend in Franklin is described as neutral, showing limited change over recent years.
Does air quality vary within Franklin?
Air quality can fluctuate across Franklin due to local factors like traffic and industrial patterns, as is common in many communities.