HighlightsParticle size distribution is divided in two groups, particles sized under 50 μm and particles within the range of 100–1000 μm.Soot particles are represented by amorphous carbon, while in 5% of cases structured carbon particles is found.According to RAMAN spectra, large particles are carbon agglomerates of irregular form.Samples contained metals hazardous to organisms such as Al, Cd, Cr, Cu, Fe, Mg, Ni, Pb and Zn.Buses running on diesel fuel are the source of emission of predominantly large particles.

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