Abstract
The mechanism of noise generation by large wind turbine generators (WTGs), and the sound level impact can vary dramatically over time at a given receptor location, and to a degree greater than many other types of industrial noise. It is widely known that WTGs tend to emit greater sound power as wind speed increases, but it is perhaps less predictable how other environmental factors influence the radiated sound power for a given reference-height wind speed and the propagation of sound to a receptor.