Air pollutants are separated into two categories: primary pollutants and secondary pollutants.
污染物可分为两类别：主要染物及次级污染物。
Igars and cigarettes, the primary source of ETS [environmental tobacco smoke], are smaller sources that emit pollutants near people and thereby exposures to ETS are very localized.
雪茄烟和香烟，这两个二手烟的重要来源只是靠近人体的污染源中的相对较小的来源，因此环境烟海的暴露度非常局限。
But strict controls and transfer of pollutants to safe locations is a primary concern.
但是对发电站严格的控制和把污染物运输到安全的地点是主要的关注点。
But strict controls and transfer of pollutants to safe locations is a primary concern.
但是严格控制和将污染物转移到安全地点是首要关注的问题。
Motor vehicles are the primary source of several important air pollutants: carbon monoxide, volatile organic compounds, and nitrogen oxides.
机动车辆是几种重要的空气污染物的主要来源：一氧化碳、挥发性有机化合物，和氮氧化物。
The various affecting atmospheric pollutants diffusion is analyzed and the effect tendency of primary factor to atmospheric pollutants diffusion is discussed.
本文分析了影响大气污染物扩散的各种因素，讨论了主要因素对大气污染物扩散的影响趋势。
Perfluorinated compounds are emerging persistent organic pollutants. Wastewater treatment plants are reported to be one of their primary sources.
全氟化合物是一种新型持久性有机污染物，污水处理厂是其一个主要污染来源。
Perfluorinated compounds are emerging persistent organic pollutants. Wastewater treatment plants are reported to be one of their primary sources.
全氟化合物是一种新型持久性有机污染物，污水处理厂是其一个主要污染来源。
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