Description of the measurement of an individual’s continuous sound exposure during a 31-day period

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Abstract
A dosimeter based on the equal energy rule with range from 55-110 dB was used to monitor continuously the noise exposure of 1 subject. The subject works in a relatively quiet laboratory area. The daily A-weighted average sound level was measured for each 24-h period [Leq(24)] beginning at approximately 8:00 a.m. During the day the noise exposure associated with specific activities was noted. The 31-day average sound level was 76 dB while the daily Leq(24) values varied from a low of 59 dB to a high of 83 dB. The type of activity that contributed most of the subject''s total sound dose was night-time parties at private homes or nightclubs. Five such parties accounted for 42% of his total sound dose. One exposure at an automobile hobby shop and 3 outings at a bowling alley contributed another 27% to the total sound dose. If these outside recreational activities had been avoided, the 31-day average sound level would have been reduced to 71 dB. The problems involved in monitoring a 24-h noise exposure are discussed.

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