10dB

Day-Night Average Sound Level

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The Day-Night Average Sound Level (Ldn or DNL) is the average noise level over a 24 hour period. the noise between the hours of 10PM and 7AM is artificially increased by 10dB. This noise is weighted to take into account the decrease in community background noise of 10dB during this period.

The Federal Aviation Administration has established this measure as a community noise exposure metric to aid airport noise analyses under Federal Aviation Regulation Part 150.

Retrieved from "http://en.wikipedia.org/wiki/Day-Night_Average_Sound_Level"

Categories: Orphaned articles from July 2006 | All orphaned articles | United States administrative law | Federal Aviation Administration | Airport terminology

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