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Sources and seasonal variation of atmospheric polycyclic aromatic hydrocarbons in Dalian, China: Factor analysis with non-negative constraints combined with local source fingerprints

Local Source FingerprintsEnvironmental ChemistryEnvironmental MonitoringEngineeringAtmospheric ScienceAir QualitySource ApportionmentFactor AnalysisAir PollutionSeasonal VariationPolycyclic Aromatic HydrocarbonEarth ScienceChemical Emission