3.18 night-average sound level. Time-averaged frequency-weighted sound level between 0000 and 0700 hours and 2200-2400 hours. Unit, decibel (dB); abbreviation, NL; symbol, Ln.
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3.18 night-average sound level. Time-averaged frequency-weighted sound level between 0000 and 0700 hours and 2200-2400 hours. Unit, decibel (dB); abbreviation, NL; symbol, Ln.
« Back to Standards Terminolgy Index