German Federal Organization Against Aircraft/Airpo
Bundesvereinigung gegen Fluglärm e.V. BVF is the representant of people by Art. 32 German air traffic law. Site has extensive information about airport and aircraft noise, noise protection and other aspects of air traffic, and links to other sites. Mostly in German, some English.
Institute of Noise Control
The Institute of Noise Control Engineering of the USA is a professional organization. A primary purpose of the Institute is to promote engineering solutions to environmental noise problems.
National Council of Acoustical Consultants
Major international organization of acoustical consultants.