The following formula represents the exposure duration in minutes such that noise at x dBA for T(x) minutes or longer becomes hazardous (NIOSH 1998, 1-2). I will refer to T(x) values as T-durations.
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We can compose the two functions to obtain the T-duration as a function of being x metres away from a source that is D decibels loud at 1 metre away.
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Here is another slider one can use to play with the number of metres and see specific values of the decibels and T-durations, respectively.
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