介绍:

smog 雾霾

mask 口罩、面膜

A mask is an object normally worn on the face, typically for protection, disguise（伪装）, performance, or entertainment.

gas mask 防毒面

oxygen mask 氧气面罩

air purifier /ˈpjʊrɪfaɪər/ 空气净化器
An air purifier is a device which removes pollution from the air in a room.

fire extinguisher 灭火器 /ɪkˈstɪŋɡwɪʃər/