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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 防毒面具
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/