noun
sulfur dioxide gas; sulfurous acid gas
Chemical term for SO₂ gas. In everyday contexts, often referred to simply as 二酸化硫黄 (にさんかいおう).
火山活動によって亜硫酸ガスが放出された。
Sulfur dioxide gas was released by volcanic activity.
More common modern term for sulfur dioxide; 亜硫酸ガス is an older or more traditional chemical name.
Compound of 亜硫酸 (ありゅうさん, 'sulfurous acid') and ガス ('gas').