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Temporal and spatial trends of particulate n-alkanes C 24 –C 33 have been investigated at urban-fringe and traffic exposed inner urban sites of a larger European city. The annual average sum of n-alkanes at the four sampling sites ranged from 21 to 31ngm −3 . The urban impact factor was ∼30% averaged over the year. The seasonal biogenic emissions of the uneven n-alkanes cause...
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