DOI: 10.1101/513093Jan 7, 2019Paper

Time- and size-resolved bacterial aerosol dynamics in highly polluted air: new clues for haze formation mechanism

BioRxiv : the Preprint Server for Biology
Ting ZhangMaosheng Yao


Aerosol chemistry is often studied without considering microbial involvements. Here, we have applied a high-volume (1 m3/min) aerosol sampler and the Micro-Orifice Uniform Deposit Impactor (NanoMoudi) along with molecular and microscopic methods to investigate time-and size-resolved bacterial aerosol dynamics in air. Under high particulate matter (PM) polluted episodes, bacterial aerosols were detected to have a viability up to 50-70% in the 0.56-1 μm size range, at which elevated levels of SO42-, NO3- and NH4+ were concurrently observed. Engineered or acclimated for both pharmaceuticals and wastewater treatment, bacteria such as Psychrobacter spp., Massilia spp., Acinetobacter lwoffii, Exiguobacterium aurantiacum, and Bacillus megaterium were shown to have experienced massive abundance shifts in polluted air on early mornings and late afternoons, on which were previously reported to witness rapid new particle formation events. For example, Acinetobacter spp. were shown to account for > 96% abundance at a corresponding PM2.5 level of 208 μg/m3. The bacterial aerosol changes corresponded to the observed PM2.5 mass peak shift from 3.2-5.6 μm to the high viability size range of 0.56-1μm. Additionally, it is interesting that elevat...Continue Reading

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