Analysis on Indoor Air Quality of Wuhan Metro System, 2017-2018

Objective To investigate the environmental sanitation condition of the platform and station hall of four subway lines in Wuhan City, and to provide sanitary basis for the operation of subway.

Methods According to the requirements of national standards. The temperature, relative humidity, wind speed, carbon dioxide, carbon monoxide, formaldehyde, illuminance, noise, total number of bacteria and concentration of radioactive radon in the air of platform floor and hall floor of Wuhan metro line 11, line 7, Zhifang line and south extension line 2 were detected and evaluated of 2017-2018.

Results The indexes detected on platform floor and station hall floor all conform to the requirements of national standards. The formaldehyde in the platform floor of various railway stations was 0.030 mg/m³, the illumination was 460.594 Lx, and the radon was 24.650 bq/m³, all of there were lower than the station hall floor, and the difference was statistically significant (P < 0.01).The total number of bacteria, formaldehyde, temperature, wind speed, carbon monoxide, carbon dioxide and radon of the four routes were statistically significant (P < 0.01). There were no statistically significant difference in noise and illumination (P>0.05).

Conclusion There were some differences between the platform floor and the hall floor. Some indexes of different subway lines were different. Wuhan metro line 11, line 7, line paper square, line 2 south extension line overall air quality condition were good.