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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Day-night average sound level ： ウィキペディア英語版 Day-night average sound level 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 10 dB. This noise is weighted to take into account the decrease in community background noise of 10 dB 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. The FAA says that a maximum day-night average sound level of 65 dB is incompatible with residential communities.〔(【引用サイトリンク】url=http://www.massport.com/environment/environmental-reporting/noise-abatement/noise-monitoring/ )〕 Communities in affected areas may eligible for mitigation such as soundproofing. ==See also== *Aircraft noise 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Day-night average sound level」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.