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Final report, submitted in February 2000, on EU project ENV4-CT97-0419, running from 01.01.98 - 31.12.99.

The major objectives of the project were:

- To quantify the different chemical and photochemical loss processes of intermediate carbonyl compounds formed in the breakdown of volatile organic compounds (VOCs).
- To obtain new data on photolytic parameters and to evaluate the importance of photolysis processes compared to competing reactions.
- To provide information on the photodissociation rates of photolabile compounds under atmospheric conditions.
- To assess the importance of the investigated processes on ozone formation using numerical modelling in order to improve the understanding of the chemistry in the boundary layer.

The major results of the project concentrate on detailed mechanistic interpretation of the lab and smog chamber data. The most important result is that the calculated photolysis rates differ in many cases quite substantially from in-situ photolysis rates. It is experimentally shown that absorption spectra extending in the near-visible do not necessarily signify that the photodissociation rate will be correspondingly high.

Additional information

Authors: MOORTGAT G K, MPI, Mainz (DE);WIRTZ K, CEAM, Valencia (ES);HJORTH J, European Commission, Joint Research Centre, Institute for Environment and Sustainability, Ispra (IT);LJUNGSTRÔM E, University of Goeteborg (SE);RUPPERT L, University of Wuppertal (DE);HAYMAN G, Atomic Energy Authority, Culham (GB);MELLOUKI W, CNRS, Orléans (FR);LJUNGSTROM E, University of Goeteborg (SE)
Bibliographic Reference: EUR 20254 EN (2002), pp.293. Euro: Free of charge
Availability: Available from European Commission, JRC Knowledge Management Unit, Ispra (IT) Tel: +39 033278 9843 or +39 033278 9864 Fax: +39 033278 9623 E-mail:
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