Swansea, 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.
Swansea, MA air quality summary: Swansea, MA holds an excellent clean air score of 88.6 and an A grade. The city's annual PM2.5 mean is 5.1, indicating relatively low long-term particulate exposure. Swansea's annual PM2.5 mean is 5.1, representing the average concentration of fine particles in the air over the course of a year. Long-term air quality in Swansea has been improving over recent years.
Clean Air Score
An A grade and clean air score of 88.6 reflect exceptional long-term air quality. This suggests a very healthy environment for residents with minimal exposure to significant pollution sources.
🏡 What This Means for Buying
Air quality is a standout positive feature for Swansea and should be considered a major benefit for homebuyers. It offers some of the cleanest air in the broader coastal region.
Indoor Air Quality in Swansea, 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 Swansea.
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 Swansea:
- 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 Swansea Homes:
🩺 My Health Risk Assessment
See how Swansea'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, Swansea's air quality improved by 1.7 μg/m³. Based on NBER studies, this change correlates with a estimated 6.8% increase in relative property value retention.
Cleaner Alternatives in MA
Why Swansea earned a 88.6
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% | 98.4 |
| Unhealthy Days | 25% | 100 |
| 5-Year Trend | 20% | 58.5 |
| Seasonal Variability | 10% | 92.3 |
| 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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Swansea Air Quality FAQs
Is Swansea a good fit for people who care about long-term air quality?
Swansea is an outstanding choice with its clean air score of 88.6 and A grade. The annual PM2.5 mean of 5.1 is well below regional averages, offering low long-term exposure.
What is the frequency of unhealthy air or long-term pollution exposure in Swansea?
Swansea recorded 0% unhealthy days, reflecting its consistently high air quality. The A grade and 5.1 PM2.5 mean confirm that pollution levels remain low year-round.
Is air quality in Swansea improving or getting worse over time?
The air quality in Swansea is improving. Long-term trends indicate that fine particulate matter levels have been decreasing steadily.
Does air quality vary across different parts of Swansea?
Air quality can vary within the city due to local traffic, industry, and location patterns. Proximity to major roads or the coastline can lead to minor localized differences in air conditions.