title: Soot in urban atmospheres: determination by an optical absorption technique.
abstract: We have used the high optical absorptivity of urban and source particulates to trace their "graphitic" component. The optical absorptivity and the particulate carbon loading show a strong correlation. Analyses of the data indicate that primary soot emissions compose a major fraction of the carbonaceous aerosol and put a low limit on secondary organic material produced in correlation with the ozone concentration.
authors.forename: H
authors.initials: H
authors.lastname: Rosen
authors.forename: A D
authors.initials: AD
authors.lastname: Hansen
authors.forename: R L
authors.initials: RL
authors.lastname: Dod
authors.forename: T
authors.initials: T
authors.lastname: Novakov