10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
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Indoor-Outdoor Particulate Relationship and Its Metal Bound Concentrations in Domestic Homes of ‘World Heritage Site’ Agra, India
HIMANSHI ROHRA, Ajay Taneja, DR. B.R.A. University, Agra, India
Abstract Number: 67 Working Group: Aerosol Exposure
Abstract The present work endeavours to parade the influence of particle size and associated metals (Al, Ba, Ca, Cu, Fe, K, Mg, Mn, b, Cd, Co, Zn) within coarse (2.5-10µm), accumulation (2.5-0.25µm) and ultrafine (UF) (<0.25µm) particulate matter (PM) ranges in living rooms of residential homes with their subsequent comparison with outdoor levels at Agra, India. Higher PM concentrations were measured through cascade impactor in indoors (PM10= 264 µg/m3; PM2.5= 195 µg/m3) as compared to outdoors (PM10= 212 µg/m3; PM2.5= 153 µg/m3); both surpassing the WHO benchmark targets. In view of size segregated aerosol, q-UF particles dominated indoor (37%) and outdoor (28%) concentration levels; accounting as major health concern. Poor relationship between indoor-outdoor particle sized levels and coarse and fine PM indicate heterogeneity of sources in concurrent with wash out of particles during precipitation events in sampling tenure. A unimodal lognormal distribution of PM was obtained with preference to droplet mode peak (1.0-0.5µm) in outdoors that shifted to smaller size (0.5-0.25µm) in indoors. For K, Co, Zn, modal shifting in indoor vs outdoor aerosol distribution were observed. The applied regression model further inspected the infiltration capacity of varied particle size modes in different housing conditions. Shifting of particles towards q-UF range in indoors of roadside homes impacted resident exposure to toxic particles. This work prerequisites in designing pollution control strategies to achieve a healthier indoor living environment in this area.