目的：大气中SO 2污染会对人体健康带来潜在的危害，因此有必要了解广州市区SO 2污染与人群暴露水平。

Objective: As there is a potential health impact of SO 2 pollution on human body, it is important to understand the characteristics of population exposure to SO 2 in the urban area of Guangzhou.

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目的了解我国农村欠发达地区空气污染的状况及农村人群对空气污染的实际暴露水平。

Objective To evaluate the levels and characters of indoor and outdoor air pollution in rural areas of China.

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