IMPACT OF BIOGENIC HYDROCARBONS ON PHOTOCHEMICAL OZONE FORMATION - PRELIMINARY-RESULTS

Sunlight irradiation of monoterpene hydrocarbons (alpha-pinene, beta-p inene and linalool)-NOx-air, and toluene-NOx-air mixtures were carried out for part-per-billion concentrations in order to study the impact of biogenic compounds on photochemical ozone formation. Preliminary ev idence indicates that approximate to 60 % extra carbon supplied by e.g . linalool added to a ambient air/NOx-air mixture results to a small c hange of O(3)max up to about 12 %. Pinonaldehyde, the main product of the gas-phase oxidation of alpha-pinene shows a high ozone forming pot ential, up to 100 % with regard to ambient air mixtures without pinona ldehyde.