How dirty is the air in the subway? The air in the subway is not fresh and circulating, and the density of the crowd is large, causing hypoxia. But for the people in beishangguang, the essential means of transportation is the subway, so how to take the subway to prevent diseases?
For commuters taking the subway every day, the round-trip time is generally 1 to 2 hours, that is to say, there are 1 to 2 hours in the anoxic and dirty air environment every day, 'long-term exposure to this environment is not only to affect lung function, anoxia will cause damage to the whole body organs'.
In the morning and evening of the peak subway, people tightly stick together, even breathing becomes difficult. The data shows that 5 million small particles can be generated per minute in the subway; the average PM 2.5 value of the subway, especially the platform, is 16 times higher than the ground, and the pollution particles are complex, diverse and ubiquitous.