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Supplemental Noise Metrics
What are supplemental noise metrics?
To analyze the impacts of aviation noise, the Federal Aviation Administration (FAA) uses the Day-Night Average Sound Level (DNL) as the primary metric for quantifying individuals' cumulative exposure to aircraft noise. Noise impact analysis around airports can be supplemented by computing other metrics, referred to as "supplemental", to provide more information about noise from aircraft operations. These type of metrics used to measure noise depends on the community and their activity.
Supplemental metrics include:
These metrics are computed in existing aircraft noise computer programs.
Another metric used in supplemental noise analysis but not computed in existing aircraft noise computer programs is
• Number-of-events Above a Specified Sound Level (NA)
Which supplemental noise metrics are commonly used?