Question

unit of noise measurement

Answer 1

It's basically the same for 'sound' and 'noise', i.e. Decibels.

Answer 2

1 micropascal (μPa) = 10-6 Pa – commonly used when measuring sound pressures. decibel (dB) – a measure of the intensity of a sound; 1/10 of a Bel. Decibels are a relative unit comparing two pressures; therefore, a reference pressure must also be indicated.