Polycyclic Aromatic Hydrocarbons (PAHs), their nitro-derivatives (NPAHs) and hundreds of other organic compounds are present in ambient air in gas and particulate form. PAHs and NPAHs originate from diesel and gasoline exhaust emission and other combustion sources. NPAHs are also formed through the nitration of parent PAHs in the atmosphere. Concentrations of PAHs and NPAHs in the particulate matter fraction PM10 collected in the centre of Kraków (-nitrofluoranthene and 1-nitropyrene were

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... ted from particulate matter and analysed applying the GC/MS technique. Depending on the compounds the relative recoveries ranged from 72 to 94%. The concentrations of PM10 in the study period ranged between 23.5 and 153.8 µg·m -3 . The average concentrations of PAHs and NPAHs ranged from 26.6 to 276.4 ng·m -3 and from 0.6 to 9.1 ng·m -3 , respectively. The highest concentrations were observed for benzo[a]pyrene, benzo[a]anthracene, pyrene and fluoranthene. The average concentration of benzo[a]pyrene (BaP), which is a marker for the particle-bound atmospheric PAHs, was 9.5 ng·m -3 . The concentrations of 3-nitrofluoranthene and 1-nitropyrene were below the quantification limits of the method (< MQL). 1000091 e3sconf/2016 E3S Web of Conferences SEED 00091 (2016)