April 1, 2019August 12, 2026

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

Notes

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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As the source for federal transportation grants, the Puget Sound Regional Council was charged with developing a system to meet the growing need for commercial aviation. When the search for a second airport failed, they authorized the Port of Seattle to build the Third Runway, with a mandate to develop a noise abatement and mitigation program. In their effort to stop the Third Runway, the ACC argued over every detail of the Port's efforts--including property buyouts and sound insulation. The dispute was meant to be settled by a three member Expert Arbitration Panel. This is their final report. It finds 2-1, that the Port's program was insufficient in several respects. Despite that, funding for the Third Runway was approved by the PSRC, and the 'Port Package' program, proceeded largely unchanged. Expert Arbitration Panel's final decision finding that the Port of Seattle had not shown sufficient reduction in real on-the-ground noise impacts to satisfy noise reduction conditions required for approval of a third runway at Sea-Tac International Airport. The majority decision concluded the Port's noise abatement programs were insufficient despite being impressive in scope.

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