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To investigate the status and distribution characteristics of microbial pollution on the surface of indoor air and public facilities at a metro station of a city in the central south China.
The total number of bacteria and fungi in the air and those of bacteria, fungi, coliform, and Staphylococcus aureus on the surface of key public facilities were sampled and detected. Multiple linear regression and Logistic regression were used to analyze the influencing factors.
The median of the total number of bacteria and fungi in the indoor air of metro station was 194.35 and 346.29 CFU/m3, respectively, the median of the total number of bacteria and fungi on the surface was 15.00CFU/25cm2 and 0.00CFU/50cm2, and the positive rates of coliform group and Staphylococcus aureus were 2.22% and 11.11%, respectively. There were differences in the temporal and spatial distribution of microorganisms in the indoor air of the metro: the total number of bacteria in the station hall was the highest and the total number of fungi in the platform was the highest; the total number of bacteria was the highest in the early peak period and the highest in the evening peak period. The total number of bacteria and fungi on the surface of the ticket inspection machine was higher than that of other public facilities, the total number of fungi on the surface of public facilities at noon was lower than that in the evening peak period, and the positive rate of coliform group was lower than that in the morning peak period. The total number of bacteria in the indoor air of subway station was negatively correlated with temperature (β=-0.06,95%CI: -0.11 to -0.01) and wind speed (β=-0.28, 95%CI: -0.55 to -0.01). The total number of air fungi was positively correlated with relative humidity (β=0.01, 95%CI: 0.00 to 0.02) and negatively correlated with PM2.5 (β=-0.01, 95%CI: -0.02 to-0.01). There was a negative correlation between the total number of bacteria on the surface and PM2.5 (β=-0.04, 95%CI: -0.07 to -0.02).
The level of microorganisms in indoor environment of three metro stations in a city in the central south China is low, and the surface of public facilities is contaminated by pathogenic bacteria. The distribution of bacterial and fungal concentrations in metro stations vary among regions and time periods, which is related to temperature, humidity, wind speed, and PM2.5.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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