👉 Dioxides are a group of organic compounds that contain one or more oxygen atoms. They are produced when certain chemicals react with other substances, such as sulfuric acid, and they can have harmful effects on humans and the environment. In general, dioxides are formed when two chemicals react in a chemical reaction, such as burning a coal or using a fuel. The reaction produces products that can be toxic if not handled properly. Dioxides can also cause respiratory problems for people who breathe them