Noise pollution is measured in?

Question

Noise pollution is measured in

(a). Hertz

(b). Fathom

(c). Nanometer

(d). Decibel

Answer 1

http://www.aandc.org/research/wind_noise...

Is interesting and so is

http://www.defra.gov.uk/environment/nois...

so the answer is definitely d , but d depends on a , not much at all to do with b  and almost certainly not c

Answer 2

a?? we both dont know

Answer 3

(d)Decibel.

'

Answer 4

decibel~!