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The Day-Night Average Sound Level (Ldn or DNL) is a noise metric used primarily to assess the impact of environmental noise, particularly in urban areas and near transportation facilities like airports and highways. It is a 24-hour average sound level that accounts for both the daytime and nighttime noise levels, with a weighting factor that penalizes nighttime noise.

Ancestors (6)

  1. Sound measurements
  2. Physical quantities
  3. Quantity
  4. Mathematical concepts
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