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. Polycyclic aromatic hydrocarbons (PAHs) are not decliningin Arctic air despite reductions in their global emissions. In Svalbard, theLongyearbyen coal-fired power plant is considered to be one of the majorlocal sources of PAHs. Power plant stack emissions and ambient air samples,collected simultaneously at 1 km (UNIS) and 6 km (Adventdalen) transectdistance, were analysed (gaseous and particulate phases separately) for 22nitro-PAHs, 8 oxy-PAHs, and 16 parent PAHs by gas chromatography in combinationwith single quadrupole electron capture negative ionization mass spectrometry (GC-ECNI-MS)and gas chromatography in combination with triple quadrupole electronionization mass spectrometry (GC-EI-MS/MS).Results confirm low levels of PAH emissions( ∑16 PAHs =1.5 µ g kg −1 coal) from the power plant. Phenanthrene, 9,10-anthraquinone,9-fluorenone, fluorene, fluoranthene, and pyrene accounted for 85 % ofthe plant emission (not including naphthalene). A dilution effect wasobserved for the transect ambient air samples: 1.26±0.16 and 0.63±0.14  ng m −3 were the sum of all 47 PAH derivatives for UNIS andAdventdalen, respectively. The PAH profile was homogeneous for theserecipient stations with phenanthrene and 9-fluorenone being most abundant.Multivariate statistical analysis confirmed coal combustion and vehicle andmarine traffic as the predominant sources of PAHs. Secondary atmosphericformation of 9-nitroanthracene and 2+3 -nitrofluoranthene was evaluated andconcluded. PAHs partitioning between gaseous and particulate phases showed astrong dependence on ambient temperatures and humidity. The present studycontributes important data which can be utilized to eliminate uncertaintiesin model predictions that aim to assess the extent and impacts of Arcticatmospheric contaminants.

Polycyclic aromatic hydrocarbons (PAHs) and oxy- and nitro-PAHs in ambient air of the Arctic town Longyearbyen, Svalbard