Objective to investigate impact of coal-burning air pollution on respiratory system among primary and middle school students, and to provide evidence for the prevention and control of air pollution.

目的探讨煤烟型大气污染对中小学生呼吸系统健康的影响，为大气污染的预防控制提供依据。

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Burning gas, oil and coal creates air pollution.

燃烧可燃气体、石油和煤炭会产生空气污染。

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In Ulan Bator, the air pollution is mainly related to the burning of coal, wood and everything else for heating, cooking, and electricity generation.

乌兰巴托空气污染的主要原因是燃烧煤、木材和其它所有用于加热、做饭和发电的材料。

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