A-weighted sound level

A-weighted sound level

The sound level measured with a sound-level meter using A-weighting, which alters the sensitivity of the sound-level meter with respect to frequency so that the sound-level meter is less sensitive at frequencies where the ear is less sensitive; usually used in specifying permissible sound levels in buildings.
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Measurements were also taken in the vicinity of the power plant and helped to define a "no residence" area based on a maximally allowable A-weighted sound level of 50 dB (night-time outdoor noise, limit value for urban residential areas in Austria [8]).
The A-weighted sound level does not tell the whole story, and evaluating low-frequency noise should also be considered.
The lowest A-weighted sound level represents an ideal acoustic environment.
One of the reasons of this--noise calculation software and methods used by environmental assessment professionals in transport infrastructure projects are adapted for calculating merely the overall A-weighted sound levels. The range of frequencies that is considered a low frequency sound in different countries often depends on the legally defined limit levels of the sound.
To underscore this incompatibility, when OSHA introduced the Noise Exposure Regulation (1971), the overriding principal was to "remove the hazard" or "remove the worker" when noise reached a time-weighted average of 90 dBA (A-weighted sound levels).