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Aerosol Size Distribution and Seasonal Variation in an Urban Area of an Industrial City in Central India


To study the size distribution and seasonal variations of atmospheric aerosols, size-segregated aerosol samples were collected from July 2009 to June 2010 using the nine-stage cascade impactor aerosol sampler in Durg City, India. The aerosol particles exhibited bimodal size distribution on mass concentration with a peak at 2.5–4.4 μm size ranges in the coarse mode and 2.1–2.5 μm size ranges in the fine mode. The aerosol mass and size distribution during monsoon were found unimodal distribution with a peak in the coarse mode, while they showed trimodal distributions during winter with all three peaks appearing in the fine mode. The annual mean concentration of PM10 aerosol was found to be 253.5 ± 99.4 μg/m3, which is four times higher as compared to the annual guideline of National Ambient Air Quality Standards (NAAQS) of India prescribed by the Central Pollution Control Board (CPCB), India. The highest aerosol mass concentrations were found during winter due to enormous biomass burning, while the lowest concentrations were observed during monsoon due to heavy rainfall. Air quality index values calculated in this study showed that 35 % of the days were unhealthy for sensitive people, 35 % were unhealthy or very unhealthy, while 3.3 % were found as hazardous in Durg City, India.

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The authors would like to thank Head, School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur, India for providing laboratory support to carry out this work.

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Correspondence to Manas K. Deb.

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Deshmukh, D.K., Deb, M.K., Verma, D. et al. Aerosol Size Distribution and Seasonal Variation in an Urban Area of an Industrial City in Central India. Bull Environ Contam Toxicol 89, 1098–1104 (2012).

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  • Atmospheric aerosols
  • Size distribution
  • Mass concentration
  • Air quality index