2004年秋季以来,北至京城,南至广州,都遭遇到了越来越严重的“大雾”干扰:城市能见度急剧下降,交通堵塞严重,并导致呼吸道感染等疾病频发。这种笼罩在城市上空、形似锅盖的“大雾”,并不是我们平时所说的“雾”,而是一种“灰霾”,它比“雾”的危害更大。一、雾和灰霾雾是气溶胶系统,是由大量悬浮在近地面空气中的微小水滴或冰晶组成 Since the fall of 2004, Beijing has been in the north, and Guangzhou has suffered from more and more serious “deep fog” disturbances: sharp decline in visibility in cities, severe traffic congestion, and frequent respiratory diseases. This kind of “dense fog” over the city and resembling a pot lid is not what we usually call “fog,” but an “ash”, which is more harmful than “fog.” 1. Fog and haze fog are aerosol systems consisting of a large number of tiny water droplets or ice crystals suspended in the air near the ground.