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Summary: The atmospheric microbial pollutants are potentially correlated to population density and activity as well as to human health. The higher the population density is, the heavier the air microbial pollution will become. Some meteorological factors exert great influence on air microbial pollution. Generally, wind, solar radiation and rainfalls purify air and, consequently cause a decrease in atmospheric microbial pollution. On the other hand, prevailing strong winds may favour this pollution, especially in dry conditions and in absence of vegetation. Obviously, relatively high temperatures associated with high RH enhance the growing of microbes. However, the higher the temperature is, the lower the viability of airborne microbes will be; nonetheless, with high RH a decrease in suspended particles may be recorded.