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Title: Characterization of PM, PM<sub>10</sub> and PM<sub>2.5</sub> mass concentrations at a tropical semi-arid station in Anantapur, India
Authors: Balakrishnaiah, G
Kumar, K Raghavendra
Reddy, B Suresh Kumar
Gopal, K Rama
Reddy, R R
Reddy, L S S
Narasimhulu, K
Ahammed, Y Nazeer
Balanarayana, C
Moorthy, K Krishna
Babu, S Suresh
Keywords: Particulate matter (PM)
Fine particles
Coarse particles
Meteorological parameters
Aerosol optical depth (AOD)
Issue Date: Apr-2011
Publisher: NISCAIR-CSIR, India
Abstract: The particulate matter (PM), PM<sub>10</sub> and PM<sub>2.5</sub> concentrations are estimated from regular measurements of size segregated as well as total mass concentration of near surface composite aerosols, using a ten-channel Quartz Crystal Microbalance (QCM) Cascade Impactor in a tropical semi-arid station, Anantapur, India for the period May 2006 – April 2007. The monthly variations of PM, PM<sub>10</sub> and PM<sub>2.5</sub> and season-wise shares of PM<sub>10</sub> and PM<sub>2.5 </sub>to PM have been computed. The highest contribution of PM<sub>10</sub> to PM has been noticed during local summer season, while the maximum share of PM<sub>2.5</sub> to PM has been noticed during the winter season. The average values of PM, PM<sub>10</sub> and PM<sub>2.5</sub> mass concentrations have been found to be 21.21±1.21, 18.7±1.06 and 17.02±1.28 <img src='/image/spc_char/micro.gif' border=0> g m<sup>-3</sup>, respectively. Seasonally, the concentration has been highest in winter (24.62±3.53, 22.07±2.56, 21.29±2.31) and lowest in monsoon (18.12±1.62, 16.46±1.82, 14.47±1.57) for PM, PM<sub>10</sub> and PM<sub>2.5</sub>, respectively. The back trajectory cluster analysis revealed that the aerosol loading has been significantly higher in fine mode during periods of continental air mass (winter) but when the winds shift to marine (monsoon), the loading became higher due to major contribution of sea salt aerosols, particularly in the coarse mode. PM<sub>10</sub> and PM<sub>2.5 </sub>concentrations has been highly correlated with PM and inversely correlated with local wind speed. The results of this analysis underlined the importance of local emission sources, mostly from anthropogenic, which are responsible for the high PM<sub>10</sub> and PM<sub>2.5</sub> concentration levels observed during this one year - sampling period.
Description: 95-104
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.40(2) [April 2011]

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