发现，气溶胶中由人为污染物形成的那些颗粒物元素的浓度（特别是硫）相当高，其数值与在高度工业化的美国东北部和西欧的工业城市的观测结果相当；

It has been found that the concentrations of those elements due to man-made air pollutants, especially S, are high and are comparable with those often found in the heavily industrialized eastern U.

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据环保局统计，汞的主要来源是占国内人为排汞量40%的燃煤电厂污染物。

The leading source of mercury is pollution from coal-burning power plants, which accounts for 40% of all domestic anthropogenic mercury, according to the EPA.

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PM的形成是由许多人为的因素或大自然自己散发出来的，也有污染物与空气产生相互反应而产生。

Many manmade and natural sources emit PM directly or emit other pollutants that react in the atmosphere to form PM.

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