Singh Tejveer, Khillare P S, Shridhar Vijay, Agarwal Tripti
Air Pollution Monitoring Laboratory, School of Environmental Sciences, Jawaharlal Nehru University, New Delhi 110067, India.
Environ Monit Assess. 2008 Jun;141(1-3):67-77. doi: 10.1007/s10661-007-9879-8. Epub 2007 Jul 27.
To study the visual air quality of Delhi, size fractionated aerosols - coarse and fine fractions of PM10 - were collected and analysed for SO4(-2), NO(-3), NH4+ and EC at three sites with different background activities. The analysed species constitute a smaller portion of coarse fraction (39%) but a larger portion of fine fraction (69%). The sampling was performed from June 2003 to November 2003 which covers monsoon and post monsoon seasons. Aerosol data was used to describe the spatial variation of Visibility Range as a function of chemical composition of visibility impairing aerosols. During the study period, visibility was found to be poor varying between 4.7 and 13 km with an average value of 9.4 km. It is observed that visibility impairment was more due to carbonaceous aerosol followed by sulphate.
为研究德里的视觉空气质量，采集了粒径分级的气溶胶——PM10的粗颗粒和细颗粒部分，并在三个具有不同背景活动的地点分析了其中的SO4(-2)、NO(-3)、NH4+和EC。所分析的物种在粗颗粒部分占比更小（39%），但在细颗粒部分占比更大（69%）。采样于2003年6月至2003年11月进行，涵盖季风和季风后季节。利用气溶胶数据描述了视程作为能见度受损气溶胶化学成分函数的空间变化。在研究期间，发现能见度较差，范围在4.7至13公里之间，平均值为9.4公里。据观察，能见度受损更多是由于碳质气溶胶，其次是硫酸盐。
