3.17 day-average sound level. Time-average frequency-weighted sound level between 0700 and 2200 hours. Unit, decibel (dB); abbreviation, DL; symbol, Ld.
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3.17 day-average sound level. Time-average frequency-weighted sound level between 0700 and 2200 hours. Unit, decibel (dB); abbreviation, DL; symbol, Ld.
« Back to Standards Terminolgy Index