Reducing environmental and health disparities and improving the health of Washington state residents in large port districts.

The deadline for creating a community engagement plan was moved from January 1, 2026, to June 1, 2027, and the requirement for port districts to review compliance was removed.

The requirement for qualifying port districts to obtain specific adverse impact assessments from the University of Washington's department of environmental and occupational health sciences before approving actions was deleted.

New findings were added acknowledging specific health risks like breast cancer and heart disease linked to airport pollution, and noting failures of previous noise mitigation programs like double-paned windows.

The University of Washington is now required to develop exposure maps, assess air quality and noise in specific community types (schools, homes), and create a science-based approach for evaluating impacts, recurring every two years starting June 2027.

Definitions were updated to replace general terms like 'overburdened communities' with 'aviation-impacted communities' and to specifically define aviation-related air quality and noise impacts.

New language was added to establish a grant program to support mitigation strategies and address deficiencies in previous noise mitigation projects, and to direct the state auditor to assess the Port of Seattle's past efforts.