poison gas
Refers to toxic gases, especially those used as chemical weapons or in industrial accidents.
第一次世界大戦では毒ガスが使われた。
Poison gas was used in World War I.
News broke that poison gas had leaked at the factory.
The terrorists released poison gas in the subway.
He inhaled poison gas and was taken to the hospital.
The village came under a poison gas attack.
Poison gas was generated by the factory accident.