乐山本地居民都知道,乐山中心城区以北有几条著名的“黑龙”一直在肆虐,一是北门桥附近的嘉乐造纸厂和紧邻的乐山热电厂的两根粗大的生产烟囱;二是地处城区柏杨新区附近的国营乐山造纸厂的3根粗大的生产烟囱。3个生产厂家由于历史的原因,都修建在乐山中心城区4公里范围内的正北面,3个厂都以未经消烟除尘的燃煤为生产原料。一到开工,3个厂的5根粗大的“黑 Leshan local residents know that there are several famous ”Black Dragon“ north of Leshan central city area have been raging, one is near the North Gate Bridge Jiale paper mill and the next Leshan Thermal Power Plant two thick production chimneys; two Is located in the city of Bo Yang New Area near the Leshan State-owned paper mills, three coarse chimney production. Due to historical reasons, all three manufacturers have built north of the downtown area within 4 kilometers of Leshan Central City. All three factories use raw coal without dust and smoke as raw materials for production. One to start, three plants 5 thick ”black