Quantity of CO2 gas has a positive relationship with the bacteria in the air (Kim et al., Wang et al, 2009; 2010), there are a lot of reasons why the indoor air ventilation is not good enough, and human activities (Mancinelli et al., 1987), but the Board of education and Kristinsson (2008) found that only 21% CO2 gas and nitrogen (N2) 79% can inhibit the growth of bacteria.
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