Thirteen fractions of ambient dust were investigated in Zabrze, a typical urban area in the central part of Upper Silesia (Poland), during a heating season. Fifteen PAH and Cr, Mn, Co, Ni, As, Se, Cd, Pb contents of each fraction were determined. The dust was sampled with use of a cascade impactor and chemically analyzed with an energy dispersive X-ray fl uorescence spectrometer (PANalytical Epsilon 5) and a gas chromatograph with a fl ame ionisation detector (Perkin Elmer Clarus 500). The concentrations of PM 1 and the PM 1 -related PAH and elements were much higher than the ones of the coarse dust (PM 2.5-10 ) and the substances contained in it. The concentrations of total PAH and carcinogenic PAH were very high (the concentrations of PM 1 -, PM 2.5 -, and PM 10 -related BaP were 16.08, 19.19, 19.32 ng m -3 , respectively). The municipal emission, resulted mainly from hard coal combustion processes, appeared to be the main factor affecting the air quality in Zabrze in winter.