过去,喷气式发动机的涌现,明显地减少了飞机的燃料消耗和废气的产生。但是,喷气式飞机却又带来了氮氧化物排放量增加的新问题,而氮氧化物是破坏大气臭氧层的一种主要污染物。德国研究部和航空航天局的联合调查表明,空中交通所产生的氮氧化物几乎全部 In the past, the advent of jet engines significantly reduced aircraft fuel consumption and emissions. However, jets bring new problems of increasing nitrogen oxides emissions, which are a major pollutant in destroying the atmospheric ozone layer. A joint survey conducted by the German research department and NASA shows that almost all nitrogen oxides produced by air traffic