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Dutch measure of aircraft noise
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The Kosten unit (Ke) is a commonly used aggregate measure for aircraft noise in the Netherlands, developed by the Kosten Committee 1963. A yearly average which represents outdoor noise levels.
References
Adviescommissie Geluidhinder door Vliegtuigen, 1967. Adviescommissie Geluidhinder door Vliegtuigen, Geluidhinder door vliegtuigen., TNO, Delft (1967).