Preliminary Research On The Dynamics Of Airborne Fungi Concentrations And Rapid Detection Technique In A Library Of Beijing

Indoor air quality have drawn much attention in recent years, monitoring the concentration of the biological air pollutants is necessary for improving the residential or occupational environments because of the association between various health effects and them. Fungi were the significant biological pollutants of indoor air, many epidemiology researches have shown the relationship between airborne fungi and human respiratory disabilities. Document the populations and dynamics of airborne fungi, establish a rapid, accurate detection technique were important for the public health and daily life.The study was conducted in a library of Beijing, we collected air samples monthly from two reading rooms (3rd floor, 5th floor), underground stack room, duplicate-book stack room and outdoor air, sampling began from November 2004 to October 2005. The result shows that as a natural ventilation building, the changing of indoor airborne fungi concentration was similar to the outdoor air. Outdoor air and human activity were the main source of indoor airborne fungi of library, and ventilation and cleaning can lower the fungi concentration effectively. Cldosporium, Penicillium and Aspergillus were the prevalent fungi taxa of indoor air. As the common allergenic fungi, the indoor air percentages of Penicillium and Aspergillus are often higher than outdoor, especially in winter and spring period. The granularity of indoor air fungi in library was lower than outdoors: in the two reading rooms, the airborne fungi granularity was mainly 1.0~6.0μm; in the two close stack rooms, the granularity was mainly 1.0~3.5μm so the indoor airborne fungi aerosol were more possible to invade respiratory tract.