Abstract：Objective To investigate the microbial contamination status of centralized air conditioning ventilation systems in metros in Guangzhou City so as to provide evidence for formulating the related prevention and control measures. Methods According to the requirements of Hygienic Standard for Centralized Air Conditioning Ventilation System in Public Places (WS394-2012), the microbiological indices of centralized air conditioning ventilation systems in 10 stations of 5 different lines of metros were tested in April and August during 2013-2015. Results There were statistically significant differences in the qualified rates of the total bacterial count and the total fungal count in the wind supply system between summer and winter (P<0.05). The qualified rates of the total bacterial count and the total fungal count in summer were 41.11% and 72.22% respectively. The detected maximum concentrations of the total bacterial count and the total fungal count were 11 times and 5 times higher than the standard respectively. The qualified rates of the total bacterial count and the total fungal count in the wind from the wind supply system were 58.33% and 79.44% respectively, which were all lower than the qualified rates detected in the duct’s internal surface, with statistically significant differences (P<0.05). No β-Streptococcus haemolyticus was detected. The detection rate of Legionella pneumophila in cooling water was 48.33%, and the positive detection rate was significantly higher in summer than in winter, with a statistically significant difference (P<0.05). Conclusions There exists microbial contamination in centralized air conditioning ventilation systems of metros in Guangzhou City; and hence, we should pay special attention to the risk of the contamination and effectively control it so as to avoid the occurrence of large-scale public health emergencies.
江思力, 石同幸, 吕嘉韵, 施洁, 刘俊华, 刘鹏达. 广州市地铁站集中空调通风系统微生物污染状况[J]. 实用预防医学, 2016, 23(9): 1113-1115.
JIANG Si-li, SHI Tong-xing, LV Jia-yun, SHI Jie, LIU Jun-hua, LIU Peng-da. Microbial contamination status of centralized air conditioningventilation systems in metros in Guangzhou City. , 2016, 23(9): 1113-1115.
2016, Vol. 23 
