People commonly use shampoo, hairspray~1, deodorant~2, cleaning sprays, paint and glues.Such products can dirty the air. In fact, they are as bad for urban air as is burning gasoline or diesel~3 fuel~4. That’s the finding of a recent study.人们常使用洗发水、发胶、除臭剂、清洁剂、油漆和胶水。这些产品会污染空气。事实上,它们对城市空气的危害和燃烧汽油或柴油一样严重。这是最近一项研究的发现。