SeaTac, WA
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.
SeaTac, WA air quality summary: SeaTac, WA, holds a Clean Air Score of 78.5 and an overall grade of B. The city's average annual PM2.5 concentration is 6.9 µg/m³. SeaTac recorded an annual PM2.5 mean of 6.9 µg/m³, which represents relatively low long-term particulate exposure. Long-term air quality in SeaTac has been improving over recent years.
Clean Air Score
A score of 78.5 and a B grade indicate that SeaTac consistently maintains healthy long-term air quality. This reflects low average exposure to fine particulate matter for residents.
🏡 What This Means for Buying
SeaTac's strong air quality record is a positive factor for long-term residency. Prospective homebuyers should weigh this data alongside other location and lifestyle considerations.
Indoor Air Quality in SeaTac, WA
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 SeaTac.
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 SeaTac:
- Wildfire smoke infiltration (PM2.5)
- 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 SeaTac Homes:
🩺 My Health Risk Assessment
See how SeaTac's air quality affects you and your family specifically.
Health Advice
Enjoy the outdoors! Air quality is great.
Add SeaTac Air Quality to your site
Perfect for local news, real estate blogs, and community pages.
</> Create Free Widget🏡 Property Value Impact Analysis
Between 2020 and 2024, SeaTac's air quality improved by 4.4 μg/m³. Based on NBER studies, this change correlates with a estimated 15% increase in relative property value retention.
Cleaner Alternatives in WA
Why SeaTac earned a 78.5
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% | 73.2 |
| Unhealthy Days | 25% | 100 |
| 5-Year Trend | 20% | 72 |
| Seasonal Variability | 10% | 92.6 |
| 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.
More Cities in WA
Similar Rankings Nationwide
SeaTac Air Quality FAQs
Is SeaTac a good fit for people who care about long-term air quality?
SeaTac, WA, is a healthy choice with a Clean Air Score of 78.5 and a grade of B. Its annual PM2.5 mean of 6.9 µg/m³ indicates a consistently good environment for residents.
What is the frequency of unhealthy air days in SeaTac?
SeaTac reports 0% unhealthy air days, which contributes to its B grade and healthy annual PM2.5 average. This suggests that the city is rarely impacted by severe pollution spikes.
Is the air quality in SeaTac improving or getting worse over time?
Historical data shows that air quality in SeaTac is on an improving trend over recent years. A 98.4% data completeness rate provides a reliable basis for this environmental assessment.
Does air quality vary across different parts of SeaTac?
Air quality can vary within the city due to local traffic, industry, and location patterns. Proximity to airport operations and major transit corridors can influence local particulate levels.