Below are some related articles and website links that you may find informative and useful

Articles of Interest

About Noise and Hearing

About Face Protection

Safety-Related Organizations

http://www.csagroup.org/

http://www.csse.org/

http://www.ansi.org/

http://www.asse.org/

http://www.ccohs.ca/

http://www.labour.gc.ca

http://www.worldsafety.org/

http://www.naosh.org/

http://www.wsps.ca/

http://epa.gov/

Other Helpful Links

Hellberg Safety Sweden

http://www.hellbergsafety.com

Lynn Valley MFG: Hardhat Accessories

www.lynnvalleymfg.com/products/safety/