Sound emission level

The sound emission level is the sound power level, measured in decibels, of the sound emission from a sound source at a certain measuring distance. If the measuring distance is long because the sound source is inaccessible or even spatially extended, the background noise must be kept low at the place of measurement. For example, a measurement distance of 300 m is appropriate for a 200 m high wind turbine. You shouldn't stand next to a bush where the wind is rustling, and the measurement microphone needs a microphone windscreen .

The opposite of the sound emission level is the sound immission level , which denotes the sound pressure level of interferers at the location of those affected (immission location).