Statistical
analysis
showed
different schools
significantly
different
concentrations (P < 0.05)
abundance
downtown
greatest, reaching 3.3 103 to 4.95 104 cells per m3
. However, the results showed no
significant differences between the microbial populations obtained indoors and those obtained outdoors.
The dominant genera were very similar among the six samples. Our results suggest that the majority of
the inhalable bacteria were harmless to humans. Only a small fraction of microbial pathogens were
identified, and their relative abundance appeared to increase as the concentration of particulate matter
pollution increased. Analysis of these bacteria can give important clues regarding the exposure of
kindergarten children to bacteria in indoor and outdoor air.
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