Abstract
In this study, the indoor air quality (IAQ) was investigated in a subway station with fully enclosed platform screen doors in Beijing, China. Eight indoor air pollutants, including PM2.5, PM10, SO2 (sulfur dioxide), NO2 (nitrogen dioxide), NH3 (ammonia), CO (carbon monoxide), CH2O (formaldehyde) and TVOC (total volatile organic compound), were measured for six consecutive days in October 2019. The results indicated that the IAQ in the subway station was basically stable at good levels for most times during the whole measurement period. All eight indoor air pollutants were far below their corresponding maximum allowable concentrations, except for the PM2.5 concentrations, which occasionally exceeded the concentration limits. The concentrations of indoor air pollutants in the subway station were basically within the corresponding standards. The correlation analyses showed that outdoor air pollutants have important influences on indoor air pollutants. The concentrations of PM10, PM2.5, SO2, NO2 and CO in the subway station were positively correlated with their corresponding outdoor concentrations. PM10 was statistically significantly correlated with the passenger flow and train frequency, but the other air pollutants were less impacted by the passenger flow and train frequency.
Highlights
The subway system is convenient and efficient and plays an important role in relieving the burdens of superficial traffic congestion
This might explain the increase of CH2 O concentrations which occurred at the morning or evening peaks
The TVOC concentrations remained stable during the test period, because the TVOC mostly came from the building material emissions [55]
Summary
The subway system is convenient and efficient and plays an important role in relieving the burdens of superficial traffic congestion. The electric power system has been adopted in the subway and has improved the air quality of the city [1,2,3]. The internal environment of a subway station platform is relatively confined, which can cause various types of trace air pollutants to accumulate, which will lead to potential health risks [4,5]. Epidemiological and toxicological studies show that the concentration of particulate matter, NO2 and SO2 , can affect the cardiovascular, pulmonary functions and respiratory system [6,7,8]. Short-term exposure to PM2.5 increases the risk for hospital admission for cardiovascular and respiratory diseases [9]. Long term exposure to PM2.5 increases respiratory disease, chronic lung disease, and mortality [10].
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