Since the beginning of winter, with the lowering of temperatures, coupled with the occasional haze shrouded in the north and south, as well as the rainy streak in the south, I believe that we often see some residents choose to exercise in the underground garage, or walking, or jogging, or even dancing. The author believes that the exercise in the underground garage, the human body is more harmful than chronic “suicide”. 1, the underground garage air quality is poor According to the Shanghai Institute of Environmental Science data in September 2014, the underground garage carbon monoxide, nitric oxide, non-methane total hydrocarbons, PM10 and other pollution are significantly higher than outdoor air, especially carbon monoxide, up to 33% ~ 104%. The reporter of Liaoshen Evening News also measured PM2,5 in six underground parking lots in Shenyang, and the results showed that PM2,5 in the parking lot was as high as 121 micrograms/m3. 2, the subway air quality is worrying Earlier this year, an environmental research institute called Darwin measured the Beijing subway platform and outdoor measurement values, after comparison found that the underground PM2, 5 values equivalent to 16 times outdoor. The “Environmental Quality Analysis of Shanghai Metro Platforms” shows that the average concentrations of PM1, 0, PM2, 5 and PM10 on Shanghai test platforms reached 234ug/m3 (micrograms per cubic meter), 293ug/m3 and 372ug/m3, respectively, and the concentration of particulate matter exceeded the standard more seriously. 3, underground garage exercise hazards Due to poor ventilation in most underground garages, the diffusion of pollutants is very slow, the pollutants in the exhaust emissions of cars and PM2, 5 and large particles of dust concentration content is high. Exercise in such an environment, human respiratory heartbeat accelerated, more likely to inhale these harmful substances, light dizziness, coughing, serious respiratory disease or induce cardiovascular disease, long-term exercise may even be carcinogenic. In addition, due to the dim light of the underground garage, there are also greater traffic safety hazards. 4, preventive measures In summary, despite the cold weather or rainy or snowy, please try not to go to the underground garage or basement exercise. We should choose a park with fresh air or more trees to exercise, and do a good job of insulation, rain protection and other measures. In case of rain or foggy weather, you can exercise moderately indoors, please do not go out to exercise, and do not go to the underground garage or basement to exercise. Try to reduce the activities to the crowded subway and other places, and wear a mask if necessary.