Chemical Hazards and WHMIS

Canadian Centre for Occupational Health and Safety (CCOHS) - OSH Answers Web Site - Chemicals and Materials (including WHMIS 2015)
/oshanswers/chemicals/chemical.htm

Health Hazards

Canadian Centre for Occupational Health and Safety (CCOHS) - OSH Answers Web Site - How Workplace Chemicals Enter the Body
/oshanswers/chemicals/how_chem.html

Canadian Centre for Occupational Health and Safety (CCOHS) - OSH Answers Web Site - What Makes Chemicals Poisonous?
/oshanswers/chemicals/poisonou.html

Regulatory Guidelines

Canadian Centre for Occupational Health and Safety (CCOHS) - OSH Answers Web Site - Occupational Health and Safety (OH&S) Legislation in Canada - Introduction
/oshanswers/legisl/intro.html

Canadian Centre for Occupational Health and Safety (CCOHS) - OSH Answers Web Site - OH&S Legislation in Canada - Basic Responsibilities
/oshanswers/legisl/responsi.html