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Do you wear a mask when you take the subway every day?
REEI 2019/12/09

On December 9, 2019, The Paper released a report on subway pollution, which quoted REEI’s research results on the air quality in Beijing subways, that is, whether it is during the heating season or the non-heating season. Compared with the average PM2.5 concentration in Beijing's air, the PM2.5 concentration in subway is always higher. 

For the full report, please refer to:每天乘坐地铁的你,戴口罩了吗?