Author(s)

A. Borbon, N. Locoge, M. Veillerot, J.C. Galloo & R. Guillermo

Abstract

The contribution of biogenic and anthropogenic sources to NMHC levels at urban scale A. Borbon', N. Locoge', M. Veillerof, J.C. GalW & R. Guillermo ^ Departement Chimie et Environnement, Ecole des Mines de Douai, France ~ LETI/CEA-Grenoble, France Abstract Continuous hourly measurements of volatile hydrocarbons (HC) from C] to Cg including isoprene have been performed at two sites in Lille, northern France, since May 1997. The data have been analysed on a site-by-site and HC-by-HC basis by constructing scatter plots against acetylene, a classic vehicle exhaust tracer. A number of important sources of HC have clearly been identified including motor vehicle exhaust, evaporative emissions from vehicles or industrial sources related to the use of solvent and biogenic source through isoprene emissions. Wintertime regression equations together with selected exhaust gases tracers were used to estimate the non-vehicle exhaust fractions of individual HC. On the one hand, evaporativ

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