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What's a Decibel?

Published by Bureau of Transportation Statistics | Department of Transportation | Metadata Last Checked: February 05, 2026 | Last Modified: 2020-11-17
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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