Measuring Noise
Noise hazard depends on the level (sometimes called intensity) of the noise, its duration, and how often the exposure occurs. The point above which regular exposure to sounds becomes hazardous is a level of about 85 decibels (abbreviated dB, or sometimes dBA which is the value that more closely corresponds to human hearing). Noise is measured using a sound level meter.
You Don’t Get “Used to Noise”
Noise does not have to be uncomfortably loud, or even painful, to be damaging. You may think your ears are “used to the noise,” but what has probably happened is that your hearing has been temporarily dulled or that hearing loss has already begun.
A Rule of Thumb
When you feel the need to shout in order to be heard three feet away, the noise levels are probably 85 dBA or more and hearing protectors are recommended.
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