noxious

Gas or vapor that is harmful or unpleasant to breathe in.

A type of gas that is poisonous or very harmful.

Refers to harmful or poisonous emissions, often from industrial processes or vehicles.

有害雑草

A plant that is considered harmful to the environment, agriculture, or livestock.

有害または有毒な雑草。

有毒物質

A material or chemical that is poisonous or causes harm.

有害、有毒、または非常に不快な物質

不快なにおい

An extremely unpleasant or harmful odor.

非常に不快または有害なにおい。