The element nitrogen and sulfur in waste tyres are major precursors of secondary pollutions.
废轮胎本身含有的硫和氮是热解二次污染物产生的前驱元素。
Cooking oil fume, one of major indoor air pollutions with chemical elements, greatlyly harms the health of professional workers exposed to it.
烹调油烟是室内主要空气污染物之一，化学成分复杂，严重影响职业接触人群的健康。
Mine solid wastes and acid wastewater in resources exploitation have become two major environmental pollutions.
矿山固体废物和酸性废水已成为矿山资源开发过程中的两大环境公害。
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