title: LETTERS TO THE EDITOR.
authors.affiliation: a Lawrence Berkeley National Laboratories.
authors.forename: Michael G
authors.initials: MG
authors.lastname: Apte
authors.affiliation: b A.S.L. & Associates.
authors.forename: Allen S
authors.initials: AS
authors.lastname: Lefohn
authors.affiliation: c Ott Stanford University.
authors.forename: Wayne
authors.initials: W
authors.lastname: R
authors.affiliation: d U.S. Environmental Protection Agency.
authors.forename: William E
authors.initials: WE
authors.lastname: Wilson
authors.affiliation: e Temple University.
authors.forename: David T
authors.initials: DT
authors.lastname: Mage