|Decibels, named for Alexander Graham Bell, measure the intensity
of sound waves. A 10-point increase in decibels corresponds to a
tenfold increase in power a 30-decibel noise is 10 times more
powerful than a 20-decibel noise and 100 times more powerful
than a 10-decibel noise.
* Permissible exposure time for continuous noise before possible hearing damage can occur, according
to the National Institute for Occupational Safety and Health and CDC. If a sound reaches 85 db or
stronger, it can cause permanent hearing damage.
SOURCES: Temple University Department of Civil/Environmental Engineering