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Ambient Ultrafine Particles Near Sea-Tac Airport: Presentation to the Federal Way Transportation & Planning Commission

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Researchers from the University of Washington studied ultrafine particles (UFPs) — tiny airborne pollutants less than 100 nanometers in diameter — near Seattle-Tacoma International Airport. Their findings highlight that jet aircraft engines produce exceptionally small particles (under 30 nanometers), while diesel vehicles also contribute elevated UFP levels within about 200 meters of major roads. Although UFPs are currently unregulated, a growing body of scientific evidence suggests they pose significant health risks to nearby communities.

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Presentation by University of Washington researchers Timothy Larson, Edmund Seto, Elena Austin, Timothy Gould, and Michael Yost to the Federal Way Transportation & Planning Commission on April 1, 2019, covering ambient ultrafine particles (UFPs) near Sea-Tac Airport. Topics include UFP size classification (under 100 nanometers), health effects compared to PM2.5, diesel engine emissions elevating UFP levels within 200 meters downwind of major roadways, and jet aircraft emissions of ultra-ultrafine particles under 30 nanometers. UFPs are described as unregulated but potentially important air quality hazards.

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