I read this from Amerisure Insurance Company concerning noise on construction sites:

http://www.amerisure.com/Blog/Amerisure-Blog/How-to-improve-noise-protection-on-construction-si.aspx

This coincides with a post I made a week or so ago concerning the ‘buy quiet’ campaign (buying quiet tools):

https://safetyresourcesblog.com/2014/10/05/buy-quiet-niosh-save-hearing/