AI Article Synopsis
- Atmospheric bioaerosol particles were collected from Oct. 2013 to Aug. 2014 in Qingdao, showing seasonal variations; the highest concentration of total airborne microbes occurred in winter and the lowest in summer.
- The overall mean concentration of microbes was about 6.55 × 10(5) Cells/m(3) on clear days, which increased during hazy (7.09 × 10(5) Cells/m(3)) and foggy (9.00 × 10(5) Cells/m(3)) conditions.
- Analysis revealed that temperature and ozone levels negatively correlated with airborne microbes, while pollutants like PM2.5 and SO2 positively correlated, indicating that increased microbes can degrade air quality on haz
Article Abstract
Atmospheric bioaerosol particles were collected using a bioaerosol sampler from Oct. 2013 to Aug. 2014 in the coastal region of Qingdao. The total microbes were measured using an epifluorescence microscope after staining with DAPI (4',6-diamidino-2-phenylindole). The concentration of total airborne microbes showed seasonal variation, with the highest value in winter and the lowest in summer. The mean concentration of total microbes was 6.55 × 10(5)Cells/m(3) on non-hazy days. The total microbe concentration increased to 7.09 × 10(5) and 9.00 × 10(5)Cells/m(3) on hazy and foggy days, respectively. The particle sizes of the total microbes presented a bimodal distribution on sunny days, with one peak at 1.1-2.1 μm and another at 4.7-7.0 μm. The size distribution of total microbes showed an increase in the fine fraction on hazy days and an increase in the coarse fraction on foggy days. However, the size distribution became unimodal during a heating period. Spearman correlation analysis showed that temperature and O3 had a significant negative correlation with the airborne microbe concentration, while PM2.5, SO2, NO2, CO and the air quality index (AQI) had significant positive correlations with the airborne microbe concentration during hazy days. The increased number of airborne microbes will affect the air quality on hazy days.
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| http://dx.doi.org/10.1016/j.scitotenv.2015.10.001 | DOI Listing |
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