title: Concentration and size distribution of viable bioaerosols during non-haze and haze days in Beijing.
abstract: Accumulation of airborne particulate matter (PM) has profoundly affected the atmospheric environment of Beijing, China. Although studies on health risks have increased, characterization of specific factors that contribute to increased health risks remains an area of needed exploration. Chemical composition studies on PM can readily be found in the literature but researches on biological composition are still limited. In this study, the concentration and size distribution of viable airborne bacteria and fungi were determined in the atmosphere from May to July 2013 in Beijing, China. Samples were collected during non-haze days and haze days based on the value of air quality index (AQI) PM2.5. Multiple linear regression results indicated that concentrations of viable bioaerosol exhibited a negative correlation with PM2.5 (AQI) ranging from 14 to 452. There was a little difference in size distribution of bioaerosol between non-haze and haze days that all airborne bacteria showed skewed trends toward larger sizes and airborne fungi followed a Gaussian distribution. Spearman's correlation analysis showed that a fraction of bioaerosol with fine and coarse particles had negative and positive relations with PM2.5 (AQI), respectively. Moreover, the temporal variation of d g (aerodynamic diameter) of bioaerosol with PM2.5 (AQI) fluctuated from 9:00 to 21:00, which suggested that their deposition pattern would vary during a day. The primary research in this study implied that aerodynamic size variation should be considered in assessing the bioaerosol exposure during haze weather.
authors.affiliation: Beijing Agro-Biotechnology Research Center, Beijing Academy of Agriculture and Forestry Sciences, Banjing, Haidian District, 100097, Beijing, People's Republic of China.
authors.forename: Min
authors.initials: M
authors.lastname: Gao
authors.forename: Tianlei
authors.initials: T
authors.lastname: Qiu
authors.forename: Ruizhi
authors.initials: R
authors.lastname: Jia
authors.forename: Meilin
authors.initials: M
authors.lastname: Han
authors.forename: Yuan
authors.initials: Y
authors.lastname: Song
authors.forename: Xuming
authors.initials: X
authors.lastname: Wang
mesh_terms: D000336:Aerosols / Q000737:chemistry*; D000393:Air Pollutants / Q000032:analysis*; D001419:Bacteria; D002681:China; D002947:Cities; D004784:Environmental Monitoring / Q000379:methods*; D005658:Fungi; D010316:Particle Size; D052638:Particulate Matter / Q000032:analysis*; D014887:Weather
chemical_list: D000336:Aerosols; D000393:Air Pollutants; D052638:Particulate Matter