VERTICAL EVOLUTION OF PHOTOCHEMICAL OZONE OVER GREATER RAVENNA

Measurements of photochemical ozone were carried out by a plane during the 1996 summer season over a coastal area of Northern Italy (Ravenna ) in order to describe the daily vertical evolution of this pollutant. Results confirmed the presence of well marked layers in which ozone c oncentration notably changed. The evolution of these atmospheric layer s are strictly linked with the evolution of the lane-sea breeze circul ation. Ozone, which undergoes horizontal transport, due to the local a nemological field, resulted also subject to vertical transport mechani sms. The vertical evolution of pollutant concentrations through the da y led to the presence on the land's surface of episodes of fumigation potentially dangerous to human health.