What is a Sulfur dioxide (SO₂)?

Sulfur dioxide (SO₂) is a colorless gas with a sharp, pungent odor, primarily produced by burning sulfur or sulfur-containing compounds. It is also emitted naturally from volcanic activity. Sulfur dioxide is a vital industrial chemical, most commonly used as an intermediate in the production of sulfuric acid. It is also employed as a bleaching agent, preservative, refrigerant, and reducing agent. In the food industry, it is used in small amounts as a preservative in dried fruits and wines, though it must be labeled due to potential allergic reactions in sensitive individuals. In the atmosphere, sulfur dioxide is considered a major air pollutant, with known effects on respiratory health, thus requiring regulated emissions. When dissolved in water, it forms sulfurous acid, which contributes to acid rain. Due to its dual nature—being both useful and potentially harmful—sulfur dioxide must be handled and monitored with care.

※Includes information on some trading companies