Abstract:Airborne microbes are important biological components in urban ecosystem, they have a direct relation with ecological balance and many life phenomena in nature, and play much important roles in natural cycle of matter. The biological particles, such as bacteria, fungus spores, antinomyces, virus and so on, are widely distributed in the air. Soil, water, animal and plant life, human beings are the main sources of airborne microbes. Moreover, sewage sludge treatment, animal feeding, fermentation course and ru...