What Is Sour Gas? Acid gas is an irritating gas produced by the volatilization of acid substances such as formic acid and acetic acid. Sour gas (Chemical gas) Right! Chinese name Sour gas Foreign name sour gas Acid gas is an irritating gas produced by the volatilization of acid substances such as formic acid and acetic acid. IN OTHER LANGUAGES English Čeština Dansk Deutsch Svenska Français Italiano Nederlands Norsk Polski Português Español 日本語 한국어