TagNoise(310)

A standard audio engineering graph showing the frequency response curves for A-weighting (blue), B-weighting (yellow), C-weighting (red), and D-weighting (black) filters, plotted as Gain in dB versus frequency from 10 Hz to 100 kHz. A red arrow highlights the low-frequency region (~50-80 Hz) where the curves diverge most significantly, particularly relevant to aircraft noise assessment where D-weighting was developed specifically for aircraft noise measurement.

The City of Alexandria, Virginia issued a payment of $4,300 to Vianair, Inc., an aviation consulting firm based in Wilmington, Delaware, for an Airport Noise Study covering the period of June through November 2025. The payment was processed via electronic funds transfer (EFT) on December 23, 2025, under check number 00028041 and invoice number 1282. This document reflects the city's ongoing efforts to monitor and analyze airport noise impacts on its community.

A book published by Springer, authored by Sanford Fidell and Vincent Mestre, providing a comprehensive guide to U.S. aircraft noise regulatory policy. The work covers the regulatory frameworks, policies, and standards governing aircraft noise in the United States.

Seattle-Tacoma International Airport's Late Night Noise Limitation Program is a voluntary initiative that monitors aircraft takeoff and landing noise levels between 12:00 a.m. and 5:00 a.m., comparing them against established decibel thresholds at four monitoring sites. Noise exceedances are tracked quarterly and airlines are notified when their flights exceed the limits. The program originated from community discussions in 2018 and has been in operation since Q3 2019, running alongside a Late Night Runway Use Agreement with the FAA.