School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur 492010, Chhattisgarh, India.
Bull Environ Contam Toxicol. 2012 Nov;89(5):1098-104. doi: 10.1007/s00128-012-0834-1. Epub 2012 Sep 19.
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 PM(10) aerosol was found to be 253.5 ± 99.4 μg/m(3), 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.
为了研究大气气溶胶的粒径分布和季节性变化，我们于 2009 年 7 月至 2010 年 6 月在印度德干市使用九级冲击式空气采样器采集了按粒径分段的气溶胶样品。气溶胶粒子的质量浓度呈双峰分布，粗模态峰值出现在 2.5-4.4μm 粒径范围内，细模态峰值出现在 2.1-2.5μm 粒径范围内。季风期间的气溶胶质量和粒径分布呈单峰分布，峰值出现在粗模态，而冬季则呈三峰分布，所有三个峰值均出现在细模态。PM（10）气溶胶的年平均浓度为 253.5±99.4μg/m3，是印度中央污染控制委员会（CPCB）规定的国家环境空气质量标准（NAAQS）年度指导值的四倍。冬季由于大量生物质燃烧，气溶胶质量浓度最高，而季风期间由于降雨量较大，浓度最低。本研究计算的空气质量指数值显示，德干市 35%的日子对敏感人群不健康，35%的日子不健康或非常不健康，3.3%的日子被认为是危险的。
