English http://www.ccohs.ca/oshanswers/phys_agents/exposure_can.html http://www.ccohs.ca/oshanswers/phys_agents/exposure_can.html CCOHS - Occupational Exposure Limits in Canada specific occupational noise exposure limits English Noise - Occupational Exposure Limits in Canada Canadian Centre for Occupational Health and Safety English this site Noise – Occupational Exposure Limits in Canada Exposure Limits Canadian Centre for Occupational Health and Safety (CCOHS) Canadian Centre for Occupational Health and Safety (CCOHS)