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An investigation of environmental variables affecting concentrations of polycyclic aromatic hydrocarbons in eastern Alaska Analytical methods for determining polycyclic aromatic hydrocarbon (PAH) concentrations in spruce needles were developed and evaluated. Concentrations of four PAHs (phenanthrene, anthracene, fluoranthene and pyrene) were determined in spruce needles collected near Eastern Alaska roadways. These needle concentrations were used to develop multivariate models that described the influence of climate and geographical variables on concentrations. These variables included latitude, longitude, radial distance from urban site, elevation, temperature, precipitation, ecosystem type, tree species, non-volatile extractable content of needles, and forest fire impact. The models show that three possible sources of PAHs exist in... Categories: Data, Publication; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: M1-Changes in Plant and Animal Distributon, P2-Changes in Plant and Animal Species Due to Climate Change