The chemical formula for sulfur dioxide is SO₂. This compound consists of one sulfur (S) atom bonded to two oxygen (O) atoms. It is a colorless gas with a distinct, sharp smell. Sulfur dioxide is commonly produced by volcanic eruptions and industrial processes, such as the burning of fossil fuels. It is also used as a preservative and antioxidant in the food industry. SO₂ is notable for its role in environmental issues, contributing to acid rain and air pollution when emitted in large quantities. Understanding its chemical properties is crucial in both chemistry and environmental science.