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Pam Hardy <br />Apri19, 2008 <br />Page 4 <br />~ wes~e ~ ~ yp~ca~ nose ~eve~s m the environment <br />Common Outdoor Noise Source Noise Level Common Indoor Noise Source <br />dBA <br />120 dBA <br />Jet fly-over at 300 meters Rock concert <br />110 dBA <br />Pile driver at 20 meters 100 dBA <br />Night club with live music <br />90 dBA <br />Large truck pass by at 15 meters <br />80 dBA Noisy restaurant <br />Garbage disposal at 1 meter <br />Gas lawn mower at 30 meters ]Q dBA Vacuum cleaner at 3 meters <br />Commercial/Urban area daytime Normal speech at 1 meter <br />Suburban expressway at 90 meters 60 dBA <br />Suburban daytime Active office environment <br />50 dBA <br />Urban area nighttime Quiet office environment <br /> 40 dBA <br />Suburban nighttime <br />Quiet rural areas 30 dBA Library <br /> Quiet bedroom at night <br />Wilderness area 20 dBA <br /> 10 dBA Quiet recording studio <br />Threshold of human hearing o daA Threshold of human hearing <br />