Westfield, 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.
Westfield, MA air quality summary: Westfield, MA has a Clean Air Score of 89.3 and an air quality grade of A. The annual mean PM2.5 concentration is 5.0 µg/m³. In Westfield, the annual mean concentration of PM2.5 is 5.0 µg/m³, which is relatively low long-term particulate exposure. The long-term air quality trend in Westfield is showing limited change in recent years.
Clean Air Score
A Clean Air Score of 89.3 reflects relatively low long-term particulate exposure over the long term. This score and grade highlight the particulate matter levels in Westfield relative to clean air targets.
🏡 What This Means for Buying
For residents and homebuyers, Westfield’s air quality should be treated as one factor in a broader long-term housing decision. Evaluation should consider relatively low long-term particulate exposure as a component of living conditions.
Indoor Air Quality in Westfield, 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 Westfield.
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 Westfield:
- 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 Westfield Homes:
🩺 My Health Risk Assessment
See how Westfield'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, Westfield's air quality worsened by 0.1 μg/m³. Based on NBER studies, this change correlates with a estimated 0.4% decrease in relative property value retention.
Cleaner Alternatives in MA
No cleaner cities found in this state. Westfield is already a top performer!
Why Westfield earned a 89.3
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% | 50 |
| Seasonal Variability | 10% | 92.8 |
| 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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Westfield Air Quality FAQs
Is Westfield a good fit for people who care about long-term air quality?
Westfield holds a Clean Air Score of 89.3 and a grade of A. The annual mean PM2.5 level of 5.0 µg/m³ reflects relatively low long-term particulate exposure.
How often does Westfield experience unhealthy air or long-term pollution exposure?
The city experienced unhealthy air conditions 0% of the time during the study period. This frequency contributes to the overall grade of A for Westfield.
Is air quality in the city improving or getting worse over time?
The air quality trend in Westfield is showing limited change in recent years.
How does air quality vary across different parts of the city?
Air quality can vary within the city due to local traffic, industrial activity, and location patterns, even without localized monitoring.