Decibles Loudness and perception..

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Some decibel ratings:
0 db Threshold of hearing
30 db Whisper
40 db Buzz of mosquito
50 db Normal conversation
70 db Vacuum cleaner
100 db Subway or power mower
120 db Rock concert
130 db Jackhammer or machine gun
150 db Nearby jet plane

The following is a list of DECIBEL INTENSITIES taken from Encarta 2005.

0-Threshold of hearing
10-rustle of leaves, a quiet whisper
20-average whisper
20-50-quiet conversation
40-45-hotel, theater between performances
50-65-loud conversation
65-70-traffic on a busy street
65-90-train
75-80-factory noise( light/medium work)
90-heavy traffic
90-100-thunder
110-140-jet aircraft at takeoff
130-threshold of pain
140-190-space rocket on takeoff

http://www.newton.dep.anl.gov/askasci/eng99/eng99325.htm