secondary pollutants

The term photochemical oxidants refers to the secondary pollutants formed in photochemical smog.

光化学氧化剂这一词是指在光化学烟雾中生成的次生污染物.

Secondary pollutants produced as a result of the use of petrol-engined vehicles include nitrogen dioxide and ozone.

二次污染物是由汽油引擎车辆产生的，包括二氧化氮和臭氧。

This essay evaluates the present situation of air pollution in Fuxin city in 1996-2000 using air pollution index, analyzing the present situation, varying tendency and the reasons of pollution, and pointing out the primary pollutants and the secondary pollutants.

本文采用API空气污染指数法对阜新市1996-2000年大气污染状况进行了评价，分析了污染现状、污染变化的趋势和原因，指出了首要污染物和次要污染物。

These plant residues and sediment carrying a certain amount of pollutants, if not promptly removed from the water, may be pollutants will re-enter the water body to cause secondary pollution, thus affecting the purification of the wetland system at the same time lead to resource waste.

这些植物残体与底泥携带有一定量的污染物，如果不及时的从水体中移除，可能污染物会重新进入水体中造成二次污染，从而影响人工湿地系统的净化效果，同时造成资源的浪费。

The removal efficiency of organic pollutants characterized by AOX in a typical secondary effluent of sewage treatment plant ( Beijing GaoBeiDian sewage treatment plant) was studied by SAT ( Soil Aquifer Treatment).

研究了土壤含水层处理工艺对典型城市二级出水（北京高碑店污水处理厂）以可吸附有机卤化物（AOX）表征的有机物的去除效果。