3.19 day-night-average sound level. On a given day of the week, twenty-four-hour average frequency-weighted sound level after addition of 10 decibels to levels from midnight to 0700 hours and from 2200 hours to midnight. Unit, decibel (dB); abbreviation,...
3.16 one-hour-average sound level. Time-averaged frequency-weighted sound level during a time period of one hour. Unit, decibel (dB); abbreviation, 1 HL; symbol,...
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