Seattle Air Quality Index (AQI) Today - Live Pollution Data
Real-time air quality monitoring for Seattle, Washington. Get current AQI levels, health recommendations, pollution forecasts, and safety guidance for Seattle.
Current Pollutant Levels:
Seattle 4-Day Air Quality Forecast
Seattle 30-Day Air Quality History
Seattle Air Quality Data & Environmental Insights
Understanding Seattle Air Quality
The air quality in Seattle, Washington varies throughout the day and season. Our real-time monitoring system tracks PM2.5, PM10, ozone (O3), nitrogen dioxide (NO2), sulfur dioxide (SO2), and carbon monoxide (CO) levels to provide accurate AQI readings for Seattle.
Air quality monitoring in Seattle helps residents make informed decisions about outdoor activities. Weather patterns, local emissions, and seasonal factors all influence daily air quality readings.
Health Recommendations for Seattle Residents
Good Air Quality (0-50)
Air quality is satisfactory in Seattle. Perfect for all outdoor activities including jogging, cycling, and sports.
Moderate Air Quality (51-100)
Sensitive individuals in Seattle should consider limiting prolonged outdoor exertion, especially those with asthma or heart conditions.
Unhealthy Air Quality (101+)
When Seattle air quality reaches unhealthy levels, everyone should reduce outdoor activities and consider wearing N95 masks outdoors.
Air Pollution Sources in Seattle
Transportation
Vehicle emissions are a major contributor to urban air pollution
Local Industry
Manufacturing and industrial processes affect air quality
Weather Patterns
Wind, temperature, and humidity influence pollution dispersion
Regional Sources
Pollution can travel from neighboring areas
Best Times for Outdoor Activities in Seattle
Daily Patterns
In Seattle, air quality is typically best in early morning (6-8 AM) and late evening (8-10 PM) when traffic is lighter and atmospheric conditions favor pollution dispersion.
Seasonal Trends
Monitor Seattle AQI regularly as seasonal weather patterns can significantly impact air quality. Spring and summer often provide better conditions for outdoor exercise.
Seattle Metropolitan Area Facts
Frequently Asked Questions About Seattle Air Quality
Is Seattle air quality safe today?
The current air quality in Seattle will be displayed above with real-time data. Check the AQI value and color coding to determine if it's safe for outdoor activities.
What time of day is air quality best in Seattle?
Generally, air quality tends to be better in early morning hours (4-7 AM) and late evening (after 9 PM) when traffic is lighter. However, this can vary based on local conditions and weather patterns in Seattle.
What causes air pollution in Seattle?
Common sources of air pollution include vehicle emissions, industrial activities, construction dust, and seasonal factors. The specific mix varies by location and time of year.
How accurate is Seattle AQI data?
Our data comes from official monitoring stations and satellite observations, updated every hour. We use the same data sources as government agencies to ensure accuracy.
Recommended Air Purifier for Seattle
Health Recommendations for Seattle Residents
Seattle Outdoor Exercise Locations by Air Quality
Best Air Quality Spots
- Discovery Park (large natural preserve with Puget Sound access)
- Washington Park Arboretum (botanical preserve and natural areas)
- Green Lake Park (lake recreation with extensive green space)
- Olympic National Forest areas (pristine mountain wilderness nearby)
Moderate Air Quality Areas
- Downtown areas during off-peak hours
- Suburban parks and trails
- Residential neighborhoods
Higher Pollution Risk
- Major highway corridors
- Industrial areas
- Airport vicinity
- Downtown during rush hours
Seattle Air Quality vs Nearby Cities
How does Seattle's air quality compare to nearby cities within 300km?
Seattle's Regional Air Quality Context:
- Real-time comparison with cities within 300km radius
- Regional weather patterns affect air quality similarly across nearby cities
- Local pollution sources and geography create unique conditions
- Monitor regional trends to understand broader air quality patterns
Seattle Air Quality FAQ
What is the typical AQI range in Seattle?
Seattle enjoys good air quality with AQI typically ranging from 30-60, benefiting from its Pacific Northwest location with frequent rain, ocean breezes, and extensive forest cover that naturally filter and refresh the atmosphere.
The annual average AQI of 42 reflects the natural advantages of marine air circulation, regular precipitation that cleanses the air, and comprehensive urban forest preservation, though summer wildfire smoke can create temporary severe pollution episodes.
Air quality varies dramatically during wildfire season when regional smoke transport can overwhelm the natural advantages, while winter conditions typically provide some of the cleanest air of any major U.S. city.
When is Seattle air quality worst?
Wildfire season (July-September) can create severe air quality episodes, raising AQI from typical 35-45 to 150-400+ when smoke from Eastern Washington, Oregon, or British Columbia fires reaches the Puget Sound region.
Rush hour periods along I-5, I-90, and SR-520 create moderate pollution concentrations, raising AQI from 42 to 60-85 during peak commuting when traffic density is highest on bridge corridors.
Marine atmospheric inversions during certain weather patterns can trap emissions in the Puget Sound basin, raising AQI from 40 to 70-110 when normal air circulation patterns are disrupted.
Port of Seattle peak operations during certain wind conditions can elevate marine pollution, raising AQI from 40 to 60-90 when ship emissions combine with reduced atmospheric mixing.
How do seasonal changes affect Seattle's air quality?
Summer brings variable air quality with excellent conditions during clear periods (AQI 30-55) but potential for severe wildfire smoke episodes that can push AQI to 200-400+ during regional fire events.
Fall offers generally good air quality with AQI usually 35-60 as wildfire season ends and Pacific storms begin providing atmospheric clearing, though occasional late-season smoke events can still occur.
Winter provides excellent air quality with AQI typically 25-50, benefiting from frequent Pacific storms that wash the atmosphere and minimal wildfire risk combined with strong marine air circulation.
Spring shows excellent conditions with AQI 30-55 as ocean breezes are consistent, wildfire season has not begun, and frequent rain maintains optimal atmospheric conditions.
How does Seattle compare to other cities?
Seattle benefits from some of the most favorable natural air quality conditions of any major U.S. city due to marine air circulation, frequent precipitation, and extensive urban forest preservation.
Among Pacific Northwest cities, Seattle performs excellently due to Puget Sound air circulation advantages and comprehensive environmental policies, though shares regional wildfire smoke risks with other western cities.
The city demonstrates how maritime climate advantages combined with urban forest preservation can maintain excellent air quality in a major metropolitan area, serving as a model for sustainable urban air quality management.