TagDNL65(41)

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  • HR 5874 – Decrease Noise Levels Act

    116th CONGRESS 2d Session H. R. 5874   To require the Administrator of the Federal Aviation Administration to amend regulations concerning the day-night average sound level, and for other purposes. IN THE HOUSE OF REPRESENTATIVES February 12, 2020 Ms. Meng (for herself, Mr. Smith of Washington, Mr. Espaillat, Ms. Brownley of California, Mr. Beyer, Mr.
  • 2020-02-12

    H.R. 5874 – Decrease Noise Levels Act

    H.R. 5874, the 'Decrease Noise Levels Act,' introduced in February 2020, would require the FAA to lower the threshold for significant aircraft noise from a day-night average sound level of 65 to 60 decibels. The bill also directs the FAA to publish a public report within one year outlining a strategy to further reduce residential noise levels to 55 decibels over the following decade. Additionally, it mandates that community outreach efforts include evaluations of alternative noise measurement metrics beyond the current standard.

  • The Port Package Explainer

    Does your home have a Port Package of noise mitigation windows and insulation? Having problems with your windows? Mold? You're not alone. Help us help you.

  • DNL65 For Dummies

    There is a geographic area around every large airport where, according to a formula developed by the Federal Aviation Administration (FAA), the ‘noise’ level is equal to or greater than 65 decibels DNL (Day Night Level). That area is depicted on a noise exposure map (NEM) and referred to as the Noise Boundary or just
  • 2018-01-01

    DNL65 Boundary Map (2018)

    This document contains a series of maps outlining a highlighted geographic zone spanning several Seattle-area neighborhoods, including Glendale, Southern Heights, Boulevard Park, and North SeaTac. The yellow-shaded areas, bordered in red, appear to delineate a specific study or policy boundary likely related to Sea-Tac Airport noise impact zones. Streets and landmarks such as Hamm Creek Natural Area, Des Moines Memorial Drive, and Southern Heights Park are visible within and around the designated boundary.
  • Dnl 2018 65
    2018-01-01

    Sea-Tac Airport DNL 65 Noise Contour Map with 2018 Noise Complaints — Burien, White Center, and Tukwila

    An OpenStreetMap-based map of the Seattle–Tacoma area showing Sea-Tac Airport's flight corridor, marked with a highlighted orange corridor zone and a black oval outline indicating the primary noise impact area. Red dot clusters represent noise complaints or flight track incidents concentrated over the Burien, White Center, and Tukwila neighborhoods south of Seattle, with a secondary cluster further south near Federal Way.
  • 2018-01-01

    Part 150 2013 Noise Exposure Map NEM PLOT Future 2018

    This is the Future (2018) Noise Exposure Map (NEM/NCP) for Seattle-Tacoma International Airport, produced as part of a 14 CFR Part 150 Study Update by the Port of Seattle. The map displays DNL noise contour bands (65–70, 70–75, and 75+ dBA) overlaid on surrounding land uses, with a data table showing the DNL 65–70 dBA contour covering 4.4 square miles and affecting an estimated 9,712 people; it includes a Sponsor's Certification signed by Elizabeth Leavitt, Director of Aviation Planning and Environmental Programs for the Port of Seattle.
  • 2015-03-27

    City of Sea-Tac Noise Contours Map: Sea-Tac Airport Projected 2018 DNL Levels

    This map from the City of SeaTac shows projected 2018 average day/night noise levels (DNL) radiating from Seattle-Tacoma International Airport, with contour zones indicating areas expected to experience noise levels of 65, 70, and 75 decibels. The noise contours extend north into Burien, south into Des Moines, and affect portions of Tukwila and Normandy Park, with the most intense noise zone (DNL 75) centered directly over the airport. Prepared in March 2015 using Port of Seattle Airport Noise Programs data from July 2014, the map serves as a planning reference for land use and noise mitigation policy in surrounding communities.
  • 2013-11-19

    Seattle-Tacoma International Airport Noise Programs

    Seattle-Tacoma International Airport operates several noise programs aimed at reducing the impact of aircraft noise on surrounding communities, including sound insulation, flight track monitoring, and community land-use planning. A key component is the Part 150 Noise Study, which makes the airport eligible for federal grants and focuses on areas within the 65 decibel Day Night Level (DNL) contour, without imposing flight restrictions or shifting noise to other neighborhoods. The program also includes an updated Noise Remedy Boundary that has been expanded beyond the previous boundary to better reflect projected future noise contours around the airport.
  • 2010-04-01

    From Whence Came Ldn / DNL 65?

    by Nick Miller With FAA developing a research roadmap, and fears (hopes?) expressed by many in our airport noise community that the compatibility guideline might change, I became “curiouser and curiouser” about the real origin of 65 DNL as various claims were made about its origin, its immutability, its arbitrariness, and its scientific basis or