I know there are lots of effects of exposure to large amount of noise (wite noise and noise on construction sites) can you help me with some links to different reasearch projects related to this topic thanks in adavance Big Ed

try this: http://www.google.com/u/who?q=hearing+damage+studies&sitesearch=who.int&domains=who.int

 

it should be a good resource

It's quite amazing how much noise there is in places you wouldn't expect the noise to be over 60db or so. I recall my 7th-9th grade school cafeteria (or dining room or whatever) having even up to 90db. Yipes. Finnish people are mostly shy and quiet fellows but when they get together the noise becomes unbearable.