What is the current air quality index (AQI) in Seattle, Washington?

The air quality index (AQI) in Seattle, Washington is updated in real time on this page. AQI values below 50 are considered 'Good,' values between 51-100 are 'Moderate,' and values above 100 are considered 'Unhealthy' for sensitive groups. Check the live map above for the most current reading.

What does the Air Quality Index (AQI) measure?

The AQI is a standardized EPA scale measuring five major pollutants: ground-level ozone, particulate matter (PM2.5 and PM10), carbon monoxide, sulfur dioxide, and nitrogen dioxide. The scale runs from 0 to 500, with higher values indicating greater health concern.

What are the main sources of air pollution in Seattle?

The main sources include vehicle emissions, seasonal wildfire smoke from Pacific Northwest wildfires, industrial emissions, residential wood burning, and marine vessel emissions from the port. Wildfire smoke during summer and fall can significantly worsen Seattle's air quality.

How can I protect myself when Seattle's air quality is poor?

Stay indoors with windows closed, use HVAC air filters rated MERV 13 or higher, avoid outdoor exercise, use a HEPA air purifier, and monitor the AQI regularly. People with respiratory conditions, children, and the elderly should take extra precautions.

How often should I change my air filter to maintain good indoor air quality in Seattle?

Change your air filter every 60 to 90 days under normal conditions. During wildfire season or periods of poor outdoor air quality, change it as often as every 30 days. Homes with pets, allergies, or multiple occupants should also consider more frequent replacements.

When is air quality typically worst in Seattle, Washington?

Air quality in Seattle is typically worst from July through September when wildfire smoke drifts in from Washington, Oregon, California, and British Columbia. Winter inversions can also trap pollutants near the ground, occasionally causing elevated AQI readings during colder months.

Live Air Quality Index AQI Map Seattle Washington Today

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