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Abstract
NO, NO2 and O3 measurements from the Ground-based Cloud Experiment (GCE) campaign 1989 in the Po Valley in fog and fog free situations are presented. Extremely high concentrations of NO up to 9700 nmole m-3 (217 ppbv) are shown. From the observations the fluxes are calculated using a flux-gradient-method. A detailed observation of the evolution of gas concentrations and fluxes during one observational day supports the significance of the oxidation of NO by O3. The results strongly indicate that the soil is the main source of nitrogen oxides at this place.
