This paper expounds the source and distribution of the harmful heavy metal in Chinese environment at present, and probes into how to prevent the harmful heavy metal pollution.
就当前我国环境中有害重金属的来源及分布作了简要阐述，对如何防治重金属污染进行了探讨。
The purpose of researches on urban dust is focused on the source of dust material, composition of dust, distribution, migration and evolution, pollution effects and prevention and cure.
研究城市灰尘的目的是研究其物质来源、物质成分、分布规律、迁移演化、污染效应、防治治理等。
Objective to study distribution of air pollution source, determine the historical exposure concentration of air pollution in the region, and assure the work scope of health investigation.
目的根据区域大气污染源分布研究确定区域大气污染物历史暴露浓度，确定健康调查工作范围。
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