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Washington State legislation (PSSB 5652) aimed at reducing health and environmental impacts on communities near Sea-Tac Airport, where residents face disproportionate exposure to aviation-related air pollution and noise linked to serious health conditions. The bill establishes a grant program to fix failed noise-mitigation home improvements (known as 'port packages') and fund new mitigation strategies, while directing the University of Washington to conduct ongoing air quality and noise assessments every two years. It also requires the State Auditor to evaluate the Port of Seattle's noise mitigation efforts and directs the Department of Commerce to administer a mitigation grant program using the State Aircraft Noise and Air Quality Mitigation Account.

Researchers from the University of Washington presented findings to King County's Airport Round Table Advisory Committee showing that aviation emissions pose significant public health risks to nearby communities. Airports account for 70% of airborne lead emissions in King County, primarily from piston-engine aircraft burning leaded aviation gasoline, and multiple studies link living close to such airports with elevated blood lead levels in children. The presentation also highlighted broader health harms from aviation pollutants—including ultrafine particles and nitrogen oxides—affecting neurological, cardiovascular, and respiratory health.

Agenda for the August 11, 2025 King County International Airport Boeing Field Roundtable Advisory Committee meeting, including topics such as RNAV recommendation outreach, insurance requirements, lead impacts on community health, and Vision 2045 Airport Plan updates. Also includes minutes from the July 14, 2025 meeting covering approval of June minutes, public comment on meeting facilitation

Washington Senate Bill 5652 would require large port districts — primarily the Port of Seattle, which operates Sea-Tac Airport — to develop environmental justice plans, community engagement strategies, and impact assessments aimed at reducing health and environmental disparities for residents affected by airport and port operations. For major capital projects valued at $8 million or more, or any action adding airport gates, the port would need an independent assessment from the University of Washington on cumulative health impacts to overburdened communities, along with a plan to mitigate those impacts. The bill was introduced in February 2025 and referred to the Senate Committee on Environment, Energy & Technology.