10th International Aerosol Conference
September 2 - September 7, 2018
America's Center Convention Complex
St. Louis, Missouri, USA

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Partitioned Particulate Data and Health Risk Quantification of Metal Content in Mixed Residential Areas of Northern India

AJAY TANEJA, DR. B.R.A. University, Agra, India

     Abstract Number: 66
     Working Group: Aerosol Toxicology

Abstract
The work presents the investigation of indoor air pollution through analysis of size segregated aerosol data (>2.5 µm, 2.5-1.0 µm, 1.0-0.5 µm, 0.5-0.25 µm) in varied residential homes separated by income and location at Agra, India. The study offered that discrepancy in lifestyle and indoor activities affects indoor particle mass concentration level dependent upon the source and house characteristics. Around 28-39% increased particulate concentrations were reported in low socio-economic homes than higher waged homes. A cascade impactor with PTFE filters collected particulate matter (PM) pollutant in coarse (>2.5 µm) and fine (quasi-accumulation ranges) (2.5-1.0, 1.0-0.5, 0.5-0.25 µm). Elevated loading for smaller size particulates (PM0.5-0.25= 54.08 μg/m3) was observed. Three main behavioural groups were identified following the size partitioning trend of elements (a) elements: Fe, Ca, Cr, Cu concentrated in coarser particles (b) elements distributed mainly within fine particle ranges: Zn, K, Al, Pb, Ni and (c) elements: Mn and Mg exhibiting indefinite partitioning pattern. Fine to coarse mass concentration ratio of all metals except Fe and Cr indicated their derivation from anthropogenic indoor sources. Enrichment factor and correlational analysis gave insight of the potential sources of metals. Bioavailability index further calculated showed the importance of smaller size particles in simulated lung environment that further varied with element (21% for Pb) and size (higher in PM0.5-0.25) elucidating increase in aerosol enrichment to finest particle. Higher non-carcinogenic and carcinogenic threats were embedded within Mn (HQ= 12.1) and Cr(VI) (ELCR= 1.21*10-3 (adults); 3.63*10-4 (child)) in fine (PM2.5-1.0) and coarser (PM>2.5) fractions respectively. Results of this work provide insight into size segregated particulate monitoring and address need for inclusive investigation to study its toxicity and control measures in establishing safer indoor environment.