Exposure limits in noise exposure are a trade-off between sound level (measured in decibels) and duration of exposure (time). For an 8-hour exposure, for example, the maximum permissible sound level is 90 dB. Anything beyond 8 hours at this noise level is not allowed. But for greater exposure levels, such as 95 dB, the maximum allowed exposure time is only 4 hours. In a time-weighted average (TWA), greater noise levels require shorter exposure times, and lower noise levels allow longer exposure times. For a 12-hour work shift, the maximum allowable exposure is only 87 dB.
According to the World Health Organization Intensity safe volume must not exceed 85 decibels and hearing consecutive day 8 hours sound intensity level sound than the sound may cause damage to the ear and mind of the listener. consider it as Noise pollution .