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What's a Decibel?

Published by Bureau of Transportation Statistics | Department of Transportation | Catalog Last Checked: February 05, 2026 at 03:33 AM | Dataset Last Updated: November 17, 2020
dBs measure sound. Every day the sounds we hear usually fall between 0dB (the faintest detectable noise) and 120dB (a thunderclap). dBs are special units used to represent significant differences in energy with smaller, more manageable numbers.

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