Niu Wenyi, a professor at the Department of Social Medicine and Health Education of Peking University College of Public Health, believes that underground, closed and dense people are also important reasons for air pollution in many underground places, including subways. Some people who produce fine particles will inevitably carry some dust, and mutual friction will lead to secondary dust. Although smoking is prohibited in public places, there are still smokers who go their own way ... These factors, coupled with poor underground ventilation, eventually lead to an increase in PM2.5 in the subway. If the relative humidity in the subway is higher than 70%, there is much dust, poor ventilation and insufficient sunshine, fungi can survive for a long time, which seriously affects people's health. The harm of air pollution, especially small pollution particles, to health has been confirmed by more and more studies. Recently, the British Medical Imaging Committee of Air Pollution said that 29,000 people die prematurely in London every year due to air pollution, which is 10 times the number of traffic accident deaths. Professor Kelly pointed out that PM2.5 is currently considered as the biggest killer of health. Even healthy people, in a polluted environment for a long time, will also cause various chronic diseases in the body.
In fact, the environment in London is much better than ours, and the value of PM2.5 can reach about 100. If measured by subway, I don't know how many times it will be in London. Niu Wenyi said that this reminds us that the relevant departments should pay attention to the subway environment, such as regularly replacing the filter of subway air conditioners, monitoring and informing the public in real time, and strengthening inspection and supervision by the PM2.5 numerical health department in the subway. Reducing the generation of harmful substances is an effective measure to improve the subway air. Smoke from smoking and formaldehyde in building materials are common pollution sources. Therefore, the use of environmentally friendly decoration materials in the subway is conducive to ensuring the air quality in the subway station, and the amount of ventilation will directly affect the air quality in the subway. She suggested that the locations of air supply and exhaust ports should be reasonably arranged in railway construction, and the air supply port should be as close as possible to the source of harmful substances or areas with high concentration of harmful substances, as close as possible to customers, evenly distributed, reducing eddy currents and avoiding local accumulation of harmful substances. You can choose to wear a mask.