与此同时，中国正准备推出一套新的排放测试标准，更严格地限制氮氧化物等尾气的排放——氮氧化物等尾气会引发呼吸系统的疾病。
Meanwhile, China is preparing to introduce a new set of emissions testing standards, with tougher limits on exhaust gases such as nitrogen oxides, which cause respiratory diseases.
柴油机的尾气中颗粒物、氮氧化物和碳氢化合物含量的很高，对环境造成了严重危害。
Emissions of diesel engine cause serious harm to environment because of including a great deal of particulate, NOx and hydrocarbon.
介绍用酸性尿素溶液作吸收剂，吸收硝酸尾气中氮氧化物的净化方法。
The method for removing nitrogen oxides in the effluent gas from manufacturing nitric acid by using acidic urea solution as an absorbent to absorb the nitrogen oxides is introduced.
介绍用酸性尿素溶液作吸收剂，吸收硝酸尾气中氮氧化物的净化方法。
The method for removing nitrogen oxides in the effluent gas from manufacturing nitric acid by using acidic urea solution as an absorbent to absorb the nitrogen oxides is introduced.
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