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      Seasonal variability in size-segregated airborne bacterial particles and their characterization at different source-sites.

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          Abstract

          Size-segregated aerosol samplings were carried out near the potential sources of airborne biological particles i.e. at a landfill site, an agricultural field and a road side restaurant-cluster site in winter, spring and summer seasons during 2013-2015 in New Delhi. The culturable airborne bacterial (CAB) concentrations showed significant seasonal variation from higher to moderate in spring and winter seasons and lowest during summer. Highest CAB concentrations were observed at the Okhla landfill site followed by restaurant-cluster area and agriculture site. The CAB particles showed bimodal size distribution, abundant in the size ranges of 1.1-2.1, 2.1-3.3 and 4.7-5.8 μm. However, substantial concentrations were also observed in the size bins of 0.43-0.65 and <0.43 μm, which are important for cloud condensation nuclei (CCN) activity of aerosols in addition to their adverse health effects. In spring, bacterial particles were also maximized in size ranges between 5.8 and >9.0 μm. Fine mode proportions of CAB were found to be higher in winter than other two seasons. Bacterial identification was done by 16s rDNA sequencing, and most abundant identified strains were Bacillus cereus (16%), Bacillus licheniformis (11%), Bacillus thuringiensis (9%), Micrococcus sp. (7%) and Acinetobacter sp. (9%).

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          Author and article information

          Affiliations
          [1 ] CSIR-National Environmental Engineering Research Institute, Delhi Zonal Center, New Delhi, 110028, India. s_agarwal@neeri.res.in.
          Journal
          Environ Sci Pollut Res Int
          Environmental science and pollution research international
          Springer Nature
          1614-7499
          0944-1344
          May 2017
          : 24
          : 15
          28390023 10.1007/s11356-017-8705-2 10.1007/s11356-017-8705-2

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