10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
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Winter Time Aerosol Size Distribution Study Across Three Sites in Delhi
Suneeti Mishra, S.N. TRIPATHI, Deepika Bhattu, Varun Kumar, Suresh Tiwari, Atul K. Srivastava, Deewan S. Bisht, IIT Kanpur
Abstract Number: 1395 Working Group: Aerosol Chemistry
Abstract Particle size distribution, mass and number were measured at three sites in Delhi, during the winter of 2017.These sites were at different locations with distinct land–use patterns and sources contributing to air pollution. Vehicular emissions being the dominant source at all the three locations. Particle size distribution helps us to better understand about the sources and various atmospheric processing like aging. At all the three sites, a set of Scanning Mobility Particle Sizer (SMPS) and Optical Particle Sizer (OPS) were deployed which collectively measure size selected aerosols from ultrafine (13 nm) to coarse (10 µm) range. At the third site an additional Aerodynamic Particle Sizer (APS) measured from 0.5 µm up to 20 µm was also deployed giving a deeper insight into the coarse range. Individual distributions were merged to give wide range size distributions and understanding the mode formation at all the sites. Their temporal and spatial variation along with the diurnal properties was closely studied to understand the particle formation and the time of the day to find their source. The distributions were of three types unimodal, bimodal and trimodal depending on the time of the day. During the afternoon and evening session modes increased in the nucleation and accumulation range as compared to morning. Strong nucleation and accumulation modes observed at all three sites at different time interval suggest the different sources responsible for the particulate matter.