title: Reply to Ahad et al.: Source apportionment of polycyclic aromatic hydrocarbons in the Athabasca oil sands region is still a work in progress.
authors: Abha
authors: A
authors: Parajulee
authors: Frank
authors: F
authors: Wania
mesh_terms: D004777:Environment; D004785:Environmental Pollutants / Q000032:analysis*; D019652:Extraction and Processing Industry / Q000706:statistics & numerical data*; D008956:Models, Chemical; D010578:Petroleum / Q000032:analysis*; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis*; D018570:Risk Assessment / Q000706:statistics & numerical data*
chemical_list: D004785:Environmental Pollutants; D010578:Petroleum; D011084:Polycyclic Aromatic Hydrocarbons