Sulfur dioxide is a colorless gas with a sharp, pungent smell. It is produced naturally by volcanic eruptions and is also released during the burning of fossil fuels, such as coal and oil. This gas plays a significant role in air pollution and can contribute to the formation of acid rain, which can harm plants, animals, and buildings. In addition to its environmental impact, sulfur dioxide is used in various industries. For example, it is commonly found in the production of sulfuric acid, a key chemical in fertilizers and batteries. It also acts as a preservative in the food industry, helping to prevent spoilage.