That depends how close you measure to the bus. The closer - the louder! The distance is very important if you measure with a sound pressure level meter.
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•Sound can be measured in many ways such as decibels. There is a special machine which you can by that measures how many decibels something makes. A pin makes 10 decibels where as a loud persons or a stereo can make up to 80 decibels. Volume is measured in decibels. So Frequency is measured in hertz
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The usual symbol for decibels is dB.
An SPLOIUYTR machine measures decibels.