Investigation of Indoor Air Quality and Staff Satisfaction in Underground Buildings in Xi’an, China

With the widespread promotion of underground buildings, it is necessary to know the status of indoor air quality of underground buildings. In this study, indoor air quality was tested from 9 sites of three styles underground buildings in Xi’an. Simultaneously, a questionnaire survey was conducted with indoor staff satisfaction. The results showed the concentrations of pollutants in 9 sites except for CO were all exceeding the standard. The concentrations of formaldehyde, PM10, CO2, and TVOC all exceeded the standard of 1.26, 1.62, 1.28, and 1.66 times. Pollutions were the most serious in underground shopping malls, followed by underground snack cities and underground electronic cities. PM10 and TVOC were the most prominent pollutants, followed by formaldehyde. Indoor air quality of underground shopping malls was the worst satisfaction with people. Indoor air quality of underground electronic cities was satisfied. Satisfaction limit of formaldehyde was lower than the standard value. Satisfaction limit of TVOC was higher than the standard value. Satisfaction limit of PM10 was slightly higher than the standard value, and satisfaction limit of CO2 was close in line with the standard value. It would contribute to the development and application of underground buildings.

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