Objective To analyze the indoor air quality of 17 stations of metro line 2 in Xi'an.
Methods With reference to the Technical Rules of Health Monitoring for Public Places (GB/T 17220-1998), indicators including temperature, relative humidity, wind velocity, carbon monoxide (CO), carbon dioxide (CO2), formaldehyde, respirable particular matter (PM10), air bacteria, noise, and illumination were detected in the 17 station halls and platforms.
Results Except the temperature of Station 16 and the PM10 in Stations 9 & 10 were higher than the standards, the indicators of the other 14 stations were all within the acceptable limits. The temperature, the concentrations of CO2 and formaldehyde were higher in the station halls, and the relative humidity, noise levels, and illumination levels were higher in the platforms (P<0.05).
Conclusion The indoor hygienic quality of Xi'an metro line 2 is at a high level. Routine hygienic monitoring should be performed after the commercial operation.
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