目的研究安徽省农村居民居住环境的不同及室内空气污染与慢阻肺（COPD）患病率的关系。
Objective To study rural inhabitants living condition and room air pollution in Anhui province, and its relationship with prevalence rate of COPD.
这些引起了严重的污染问题，因为通过分子扩散的传质比涡流扩散的要慢。
This cause serious pollution problems because mass is transferred less rapidly by molecular diffusion than by eddy diffusion.
吸烟、空气污染及因工作长期接触尘埃及化学品都是导致慢阻肺病的风险因素。
Smoking and exposure to air pollution and occupational dusts and chemicals are known risk factors.
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