Westminster, CO
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.
Westminster, CO air quality summary: Westminster, CO, has a clean air score of 76.2 and a grade of B. The city reports an annual PM2.5 mean of 7.2 micrograms per cubic meter. Westminster's annual PM2.5 mean of 7.2 represents moderate but acceptable particulate exposure for the long term. Long-term air quality in Westminster has been improving over recent years.
Clean Air Score
A clean air score of 76.2 and a B grade denote healthy long-term air quality. These metrics signify that particulate levels are effectively managed and within acceptable ranges for the region.
🏡 What This Means for Buying
Air quality in Westminster is a positive factor for prospective long-term residents. The B grade reflects a stable environmental baseline for those looking for healthy residential conditions.
Indoor Air Quality in Westminster, CO
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 Westminster.
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 Westminster:
- 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 Westminster Homes:
🩺 My Health Risk Assessment
See how Westminster'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, Westminster's air quality improved by 1.8 μg/m³. Based on NBER studies, this change correlates with a estimated 7.2% increase in relative property value retention.
Cleaner Alternatives in CO
Why Westminster earned a 76.2
Raw inputs, scoring weights, and data coverage for this city.
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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% | 68.3 |
| Unhealthy Days | 25% | 100 |
| 5-Year Trend | 20% | 59 |
| Seasonal Variability | 10% | 88.9 |
| 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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Westminster Air Quality FAQs
Is Westminster a good fit for people who care about long-term air quality?
Westminster is a good choice for air-quality-conscious individuals, featuring a score of 76.2 and a B grade. The annual PM2.5 mean of 7.2 reflects healthy long-term conditions.
What is the frequency of unhealthy air exposure in Westminster?
Westminster reports a 0% frequency of unhealthy air days, consistent with its B grade. Residents rarely experience spikes in particulate matter considered unhealthy.
Is air quality in Westminster improving or getting worse over time?
Air quality in Westminster has shown an improving trend in recent years. This positive movement is an encouraging sign for future environmental conditions in the city.
Does air quality vary across different parts of Westminster?
Air quality can vary within the city due to local traffic, industry, and location patterns. Localized factors like proximity to major roads and industrial sites may cause minor variations.