TagNoise Mitigation(259)

Washington House Bill 2103 (2024) requires large port districts operating major airports, such as Seattle-Tacoma International Airport, to dedicate a growing portion of their property tax levy revenue toward programs that reduce noise and air pollution impacts on nearby communities. The bill was prompted by health and equity concerns, as studies show that communities of color living close to Sea-Tac face higher rates of asthma, heart disease, premature births, and other health disparities. Mitigation programs funded under the bill may include repairing failed soundproofing equipment, providing air purifiers, creating urban green spaces, and supporting indoor community facilities in affected neighborhoods.

Washington Senate Bill 5955 (2024) requires large port districts operating airports, such as the Port of Seattle which runs Sea-Tac International Airport, to dedicate a growing share of their annual property tax levy revenue toward programs that reduce noise and air pollution impacts on nearby communities. Starting in 2024, at least half of any levy revenue increase must fund mitigation efforts, rising to a minimum of 1% of total levy revenue by 2025 and increasing by 1% each year up to a cap of 10%. The bill was introduced in response to documented health disparities—including higher rates of asthma, heart disease, and premature births—affecting Black, Hispanic, Native Hawaiian, and Pacific Islander residents who disproportionately live within 10 miles of Sea-Tac Airport.

Chapter 15.12 of the Burien Municipal Code establishes minimum building construction standards to reduce aircraft noise for properties near Seattle-Tacoma International Airport. Buildings are divided into three noise reduction zones (35 dB, 30 dB, and 25 dB), each requiring progressively higher sound transmission ratings for walls, windows, doors, roofs, and ventilation systems. The code applies to all new construction and most additions intended for human occupancy, with limited exceptions for small remodels and non-inhabited structures like warehouses and garages.

This Port of Seattle briefing, presented by Noise Programs Manager Stan Shepherd, covers key topics related to aircraft noise management at Seattle-Tacoma International Airport, including flight procedures, noise contours, and mitigation programs. It highlights a steady rise in noise complaints received through the Noise Information Hotline and online forms, growing from 2,172 inquiries in 2014 to 2,959 in 2016, with a small number of repeat callers accounting for the majority of contacts each year.

This Port of Seattle document outlines key federal aviation noise and air quality legislation relevant to the StART (Sea-Tac Airport Roundtable) Federal Working Group, including provisions from the FAA Reauthorization Act of 2018 and proposed 2019 legislation. It highlights priority items such as evaluating alternatives to the DNL 65 noise standard, studying health impacts of aircraft noise in major metro areas including Seattle, and creating environmental mitigation grant programs for airports. Additional considerations include secondary noise insulation, increased funding for federal noise programs, and greater flexibility for local communities to address aviation impacts.

A scientific study found that aircraft noise exposure causes measurable damage to blood vessel function and increases harmful oxidative stress in mice, mimicking cardiovascular risks seen in human populations living near airports. Researchers demonstrated that three interventions — regular physical exercise, intermittent fasting, and a drug that activates a protective enzyme called α1AMPK — can each effectively prevent or reduce this noise-induced vascular damage. These findings suggest that lifestyle changes like exercise and dietary restriction may offer practical, evidence-based strategies for mitigating the cardiovascular health risks associated with aircraft noise exposure.

This document outlines a proposed framework for an Airport Citizen Participation Program centered on the Noise Remedy Update, which expanded and refined the noise element of the Sea-Tac Communities Plan from 1982 to 1984. It details four key programs — Acquisition, Demonstration, Highline Plan Update, and Noise Abatement — each with specific goals such as relocating 524 residential units, trialing neighborhood reinforcement for 26 homes, and establishing a Joint Committee on Airport Overflights. All programs feed into a public Forum coordinated by the Port of Seattle's Public Information Department, with citizen representatives serving on advisory committees.

Senate Bill 1167, introduced by Sen. Patty Murray in April 2023, would allow airports to receive additional federal funding to repair or replace sound insulation previously installed in nearby homes under the Airport Improvement Program. The bill provides a one-time waiver allowing airports to seek new federal assistance for sound insulation projects without prior government costs counting against them, provided the homes fall within the DNL 65 noise threshold or the original insulation caused physical damage. This legislation is particularly relevant to communities around Sea-Tac Airport, where aging soundproofing materials and ongoing aircraft noise concerns have prompted calls for updated noise mitigation support.