Sulfur dioxide has a more venerable history as an air pollutant than any other chemical . 作为一种空气污染物来说，二氧化硫比任何其它化合物历史更悠久。
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。
An example of the effect that nearby, mountain ridges may have on pollutant transport is give in fig. 7－4 . 图74例示了附近山峰对污染物输送可能有的影响。
Federal regulations imposed nox exhaust-emission standards on all 1973 passenger vehicle . 联帮政府的法规又强制规定了所有1973年起的新型载客汽车排放Nox废气污染物的标准。
Depending on the nature of the pollutant, this transfer can be innocuous or stimulatory to the forest . 根据污染物的性质，这种转移对森林可能是无害的，还可能有促进作用。
The point source data file contains data for sources emitting more than a specifilc amount of a pollutant per year . 点污染源数据文件列有每年超量排放污染物的污染源数据。
These air pollutant effects can be distinguished from effects of smoking, occupation, age, or social class . 这些空气污染物的影响能够与吸烟的影响、职业、年龄或社会因素的影响区分开。
The four places in the automobile from which pollutants can escape are the fuel tank, carburetor, crankcase and tail pipe . 汽车内泄漏污染物的四个位置是燃油箱、化油箱、曲轴箱和尾管。
Modification of rinsing techniques by installing cascading or counter-current rinse systems increases the contaminant concentration . 安装了阶梯式装置或对流漂洗装置，可改进漂洗技术，把污染物的浓度提高。
It is not unlikely that the components in certain forms of air pollution might also operate to induce bronchus pastic responses by this mechanism . 某些形式的空气污染物成分通过这种机理也可能引起支气管痉挛。
