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The sources of different pollutants contributing to ambient PM_2.5 in the Banja Luka (Bosnia and Herzegovina) suburban area were estimated. From January 2016 to March 2017, a total of 140 daily PM_2.5 filter samples were collected and analyzed by complementary nondestructive analytical techniques. Concentrations of Na, Mg, Al, Si, S, Cl, K, Ca, Ti, V, Cr, Mn, Fe, Ni, Cu, Zn, Br, Rb, Sr, and Pb were determined by energy dispersive X-ray fluorescence technique while black carbon concentration was estimated using multi-wavelength absorption optical measurements. Evaluation of the emission sources was performed based on the obtained PM_2.5 composition data using positive matrix factorization model. The results indicate five main groups of sources contributing to the annual mean PM_2.5 concentration (38.7 µg/m³): secondary sulfur/coal combustion 35.4% (11.8 µg/m³), biomass combustion 26.1. % (9.2 …