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With more and more serious air pollution, PM2.5 has become a major threat to people health. However, as for the subway which is a large concentrated, dense, complicated public place, the related research is limited. In this paper, the concentration of PM2.5 was measured in a subway station of northern cities, then the data was analyzed, the change law of concentration of PM2.5 was found out, which can provide a scientific basis for the proposed measures to effective control PM2.5.
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