Background Levels of Airborne Microbe in Beijing-Tianjin Region
京津地区大气微生物本底研究

In Beijing-Tianjin region of 34500km2, 1100 sampling points have been set up in different types of ecological environment, more than 20000 samples of airborne bacteria and airborne micro-fungi collected, and then over 20000 specimens of microfuhgi and 400 of bacteria identified. Tens of graphs of pollution distribution of airborne bacteris and microfungi and their variation were mapped. According to-the author, pollution conditions of bacteria and microfungi in the ambient air may be divided into seven levels, which will make pollution monitoring.of airborne bacteria available.