Translation guide
In Japanese, 'noxious gas' is most commonly expressed as 有毒ガス (yūdoku gasu), literally 'poisonous gas'. This is the standard term for harmful gases in general. For specific contexts like chemical warfare or industrial accidents, other terms like 毒ガス (doku gasu) or 有害ガス (yūgai gasu) may be used.
Referring to any gas that is harmful to living organisms, typically through inhalation.
The most common and general term for 'noxious gas' or 'poisonous gas'. Used in news, safety manuals, and everyday conversation.
Noxious gas leaked from the factory.
Please be careful not to inhale noxious gas.
Often used specifically for chemical warfare agents or highly toxic gases. Slightly more dramatic than 有毒ガス.
The use of poison gas weapons is prohibited by international law.
Literally 'harmful gas'. Often used in industrial or environmental contexts, emphasizing the harmful effects rather than immediate toxicity.
This device removes noxious gases.
Emphasizing the unpleasant odor rather than toxicity.
有毒ガス (yūdoku gasu) is the most general term for poisonous/noxious gas. 毒ガス (doku gasu) often implies chemical warfare agents or extremely toxic substances. 有害ガス (yūgai gasu) is broader and includes gases that are harmful over long-term exposure, not just acutely toxic.
Avoid directly translating 'noxious' as 有害 (yūgai) in all cases. While 有害ガス is correct, 有毒ガス is more common for immediate danger. Also, 毒気 (dokuke) exists but is archaic and rarely used.