Abstract
This study aims to assess the spatial and temporal variations of size-segregated particulate matter (PM) concentration in indoor and outdoor environments located in Vellore city, India. Size-segregated PM was measured using an eight-stage cascade impactor in traffic and residential sites during monsoon, winter, and summer seasons. Results showed that bimodal and trimodal distribution were common in indoor and outdoor environments of residential and traffic sites. Average outdoor (indoor) size-segregated mass concentration in all stages varied from 5 to 38 (7 to 42) and 4 to 32 (2 to 37) μg m−3 in traffic and residential sites, respectively. The maximum and minimum contribution to total PM mass was observed in 9 to 10 and < 0.4 μm fractions, respectively. Indoor concentration in traffic and residential sites was highest during summer and monsoon seasons. However, outdoor concentration was observed to be maximum during summer in both sampling sites. Correlation analysis of size-segregated PM mass with wind speed and wind direction indicated the non-regional source for coarse fraction concentrations and local source for fine fraction concentrations. Further, study results showed the dominance of coarse size fractions across all seasons in both sites.
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