TagNoise 101(6)
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2018-05-22Aircraft Noise 101
★ 32This presentation, sponsored by the Port of Seattle and delivered by ESA Senior Vice President Steve Alverson on May 22, 2018, provides an introductory overview of aircraft noise for community members and stakeholders. It covers the evolution and quantification of aviation noise, how it is regulated, and draws on Alverson's 37 years of experience conducting over 200 aviation noise studies. The session concluded with a question-and-answer period for attendees. -
Common Sound Levels Reference Chart
An infographic comparing common outdoor and indoor sound levels measured in decibels (dB(A)), ranging from 0 (Threshold of Hearing) to 110 dB (Rock Band / Car Horn at 3 ft.). Outdoor examples include Car Horn, Gas Lawn Mower, Noisy Urban, and Busy Highway; indoor examples include Rock Band, Food Blender, Vacuum Cleaner, and Normal Speech. -
SEL Sound Exposure Level and Energy Metrics
An educational diagram illustrating acoustic measurement concepts including Sound Exposure Level (SEL), Lmax, LEQ, and energy, plotted as sound level (dB) over time (seconds). The graphic shows how SEL compresses a noise event's total energy into a normalized 1-second value, with Lmax appearing approximately 10dB above the LEQ reference line. -
SEL and DNL 65 Noise Metrics Educational Slide — Port Of Seattle Part 150 Study
An educational slide produced by the Port of Seattle for Seattle-Tacoma International Airport explaining aircraft noise metrics, including Single Event Sound Level (SEL), Hourly LEQ, and Day-Night Level (DNL). The slide illustrates how varying numbers of daily flight events (1, 10, or 100) can produce identical DNL 65 noise levels, and includes charts showing sound levels over time periods ranging from seconds to 24 hours. -
2024-06-10SEL, Hourly LEQ, and DNL Aircraft Noise Measurement Diagram — Part 150 Study Technical Review Committee Meeting #1
Three-panel educational diagram illustrating how aircraft noise is measured and averaged across different time scales: Single Event Sound Level (SEL) showing two aircraft flyovers with Lmax and duration annotations, Hourly LEQ showing cumulative noise over one hour, and Day-Night Level (DNL) showing 24-hour noise distribution with a 10-dB nighttime penalty applied during nighttime hours. No source organization or document identifier is visible. -
2019-01-12Noise 101 Symposium: Principles of Aviation Noise
This document is a presentation from a Noise 101 Symposium held on January 12, 2019, organized by the City of SeaTac and the Port of Seattle, and delivered by Steve Alverson of Environmental Science Associates (ESA). The symposium covered four key modules: the principles of aviation noise, methods for quantifying aircraft noise, aircraft noise regulations and guidance, and principles of aircraft noise control. The half-day session was designed to provide attendees with a foundational understanding of how aircraft noise is measured, regulated, and managed in the context of Seattle-Tacoma International Airport.