Bioaerosols are usually defined as airborne particles or large molecules that are either alive, carry living organisms or are released from living organisms, presented in the form of pollen, fungal spores, bacteria, viruses, and so on. Bioaerosls account for large proportions of atmospheric particles, and may potentially influence the hydrological cycle and global climate as ice nuclei and cloud condensation nuclei. The behavior of bioaerosls in various environment is affected by the community, size, shape, and chemical components of atmospheric particles, and meteorological factors. Recently bioaerosols have attracted more and more interest, but large uncertainties exist in identifying communities and sources of a broad coverage of bioaerosols based on traditional cultivation and chemical techniques.

In this study, we will investigate and characterize the budgets, residence time, diversity and sources of cultivable and uncultivable bioaerosls in multiple continental and marine environment by molecular genetic and individual particle techniques on attempts at elucidating their possible effects on climate change.