Weighted Equivalent Continuous Perceived Noise Level

A measure proposed by International civil aviation organization to assess the continuous exposure to long-term noise of multiple aircraft.

The calculations are complicated, but the WECPNL used for environmental regulations in Japan is defined with the following simplified formula:


LA = Average power of peak levels of aircraft noise 10 dB or more greater than background noise
N = Number of aircraft departing per hour

This is weighted based on the time of day by the following:


N1 = 24:00 - 07:00

N2 = 07:00 - 19:00

N3 = 19:00 - 22:00

N4 = 22:00 - 24:00

See also: Equivalent Continuous Sound Level.

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Subjects: Noise & Vibration