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Fine Particulate Characterization and Source Apportionment

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  • Environmental Sciences
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  • Earth Science

Abstract

Abstract Fine Particulate Characterization and Source Apportionment Increasing ambient levels of fine particles due to anthropogenic activities are leading to adverse effects on human health and climate change. Indian subcontinent has witnessed high levels of air emission and its increasing concern. Air quality management in India is being studied with more rigor, in recent times due to immense pressure from public to clean the ambient air. India has also progressed in understanding TSP and PM10 sources but the amount of information available on fine particulate pollution in India is very limited. The ‘Auto Fuel Policy Report’ submitted to the Government of India by the ‘Committee’ in 2002, identified many gaps in available knowledge about the sources and recommended a need to carry out “Source Apportionment”. The present research is an attempt to address this issue with a view to fill the scientific gap. In the present study, outdoor and indoor fine particles were measured at four locations in Mumbai city, India, during 2007-2008. The fine particles were measured using a MiniVol PM2.5 Sampler. After gravimetric measurement, ions, elements, elemental carbon and organic carbon and organic markers were analyzed. The present research tried to assess air quality status for different land use patterns but the research shows that sites, though associated with particular zone are in a broader sense mixed zones. Reconstruction of mass of PM2.5 in Mumbai city indicate highest contribution from organic matter (36-52%) followed by secondary inorganic aerosols (21-27%). Contribution by crustal (6-12%), noncrustal (4-8%) and sea salt (6-11%) were low as compared to organic matter and SIA. The sources to fine particles in Mumbai were quantified using receptor technique like ‘Chemical Mass Balance’ (CMB) modeling and ‘Principal Component Analysis’. The source apportionment was attempted using source profiles developed in India and organic marker source profiles from Asia

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