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Daily PM2.5(aerosol particles with an aerodynamicdiameter of less than 2.5 μm)samples were collectedat an urban site in Guangzhou in 2014 and at a suburban site in Zhuhai in 2014-2015,respectively.Samples were subject to chemicalanalysis for various chemical components including organic carbon(OC),element carbon(EC),majorwater-soluble inorganic ions,and trace elements.Positive matrix factorization(PMF)model,were appliedto apportion sources for PM2.5 in both sites.