title: Particulate carbon in Los Angeles air.
abstract: A selective combustion method has been applied to the determination of total, organic and elemental particulate carbon in Los Angeles air. Carbon concentrations (10-56 micrograms m-3) and their temporal variations are presented for multiday smog episodes. Organic carbon/elemental carbon concentration ratios ranged from approximately 3 during the winter months to approximately 10 during the smog season. Photochemical production of particulate organic carbon is estimated to be approximately 76-118 X 10(3) kg/day, as compared to approximately 31 X 10(3) kg/day from direct emissions. This estimate is also consistent with gas-to-particle conversion considerations for precursor hydrocarbons.
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D002140:California; D002244:Carbon / Q000032:analysis*; D005843:Geography; D006801:Humans; D014505:Urban Population
chemical_list: D000393:Air Pollutants; D002244:Carbon