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PM samples had been collected from low-temperature burning/smoldering of Miocene lignites from Poland and basket willow (Salix viminalis L.) agent of biomass. The calculated levoglucosan δ13C values of xylites varied from -23.6 to -21.6‰, while for detritic coal examples they ranged from -24.2 to -23.1‰, with method of -22.7 and -23.7‰, correspondingly. The calculated levoglucosan δ13C value of basket willow-wood was -27.1‰. Values of willow wood mixtures with xylite varied from