The basic step of controlling acid rain is to lessen emits of sulfur dioxide and nitrogen oxides 控制酸雨的根本措施是减少二氧化硫和氮氧化物的排放。
2.
These efforts resulted in 70 recommendations to improve visibility on the colorado plateau and a regulatory commitment and strategies to dramatically reduce sulfur dioxide levels in 13 states 作为他们的努力成果，提出了70条关于增强科罗拉多平原可见度的建议，一个在13个州减少二氧化硫排放的规定和策略被通过。
