New alcohol and ester sources in urban areas.

For about five years new fuels were experimented on buses in Grenoble: a mi xture: of 70% diesel oil and 30% esterified rape oil. The impact of this new fuel was estimated in term of production of oxygenat ed compounds by direct comparison with the exhaust of a diesel oil motor. Alcohols, eaters and aldehydes were highly produced during the combustion. One of the emitted pollutants, ethanol was more especially studied during a n in-field campaign in the urban area of Grenoble. Then, it was proved by simulation in atmospheric simulation chamber under i rradiation and in presence of NO that ethanol can contribute to the ozone p roduction.