Learn how chemicals affect our environment. Discover how industrial emissions have polluted our ecosystems. Understand how toxic substances behave in the body and the natural environment. Toxicology is a science focusing on the harmful effects chemical and physical agents have on living organisms and biological systems. Generally speaking, toxicology is the study of poisons and pollutants. And as a U of S toxicology student, you will be studying in a new facility home to Canada’s foremost university-based centre for water pollution research.