Incheon International Airport Corporation

Aircraft Noise Unit (LdendB(A))

LdendB(A) [Day-evening-night Average Sound Level]

This is the evaluation method officially used by the FAA, which applies a weighted evaluation unit to the equivalent noise (Leq) with an additional 5 dB for the evening period (19:00–22:00) and 10 dB for the nighttime period (22:00–07:00).

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The day, evening, and nighttime weighted equivalent noise level of aircraft is calculated on a daily basis by measuring the SEL value whenever an aircraft passes, which exceeds the background noise, adding a +5 dB and +10 dB weight for the evening and nighttime periods, respectively, and averaging the cumulative SEL values.
T : Aircraft Noise Measurement Time (= 86,400 seconds), TO : Reference time (1 second)
i : i: Noise exposure level measured from 07:00 to 19:00. j : Noise exposure level measured from 19:00 to 22:00. k : 2Noise exposure level measured from 22:00 to 07:00.

The aircraft noise unit has been changed from the noise exposure planning level (WECPNL**) to the weighted equivalent continuous perceived noise level (LdendB(A)) in accordance with the related legal amendment (effective from January 1, 2023).

*Amendment to the “Enforcement Decree of the Noise and Vibration Control Act” and the “Enforcement Decree of the Airport Noise Prevention and Areas Assistance Act.”

** WECPNL(Weighted Equivalent Continuous Perceived Noise Level) : This is a calculation method that applies weights to the number of aircraft operations during the daytime, nighttime, and late-night periods based on the maximum noise level measured when an aircraft passes.

Data on International Organizations Related to Aircraft Noise

For further details, please visit the relevant websites.

ICAO Website FAA Website Flightradar24 Website

Aircraft Noise Unit (LdendB(A))

LdendB(A) [Day-evening-night Average Sound Level]

Data on International Organizations Related to Aircraft Noise

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