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Airborne Microbial Contamination Investigation in Public Places of Tianjin

The natural sedimentation method was employed to monitor air microbes at eighteen different public places. There are significant differences of microbial concentration in air among the functional places in Tianjin (p<0.05). The density of bacteria, fungi and total microbes were 1.22×104 CFU/m3, 2.6×103 CFU/m3, and 1.48×104 CFU/m3, respectively. There are 18 sampling sites, within which extremely and seriously polluted area accounted for 11%, and moderately and slight polluted area accounted for 6%, and clean and relatively clean area equally accounted for 33%. The industrial and transport regions were the most seriously contaminated district by airborne microbes in Tianjin, and our study here indicates that routine monitoring of airborne microorganisms quality plays a critical role in preventing outbreak of airborne diseases and detecting source of microbial pollution.