Abstract
The study of atmospheric particulate matter has a high significance in realising the pollution status of any region. In this study, we have investigated the nature of PM2.5 aerosol samples over a semi-urban atmosphere located in the south-western part of India, using a low volume air sampler for 5 days (120 h). The analyses of the particles were carried out using Attenuated total reflectance - Fourier transform infrared (ATR-FTIR) spectrometer and Confocal micro Raman spectroscope. IR spectrum revealed the presence of both organic compounds and inorganic ions. Raman analysis showed the presence of large number of soot particulates. Sources such as biomass burning, cooking fuel (firewood) combustion, open waste burning, sea salt, soil dust, vehicular and industrial emissions contributed to aerosol loadings in the sampling site. NOAA’s Hysplit air trajectory model were used for the identification of distant sources that contributed to aerosol loading in the sampling location. This study revealed that the quality of air around the sampling site is good and that the local emissions from open waste burning and cooking fuel (firewood) combustion contributed to the enrichment of samples with carbonaceous aerosols.
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