The relationship between tropospheric ozone and growth of radish plants during Summer 1991 in an urban and in a semi-rural site located in Central Italy are analyzed. Largest ozone concentrations and largest radish growth reductions are found in the semi-rural site. The importance of integrating the information on physico-chemical processes with biological monitoring to estimate the impact of photochemical oxidants on natural and cultivated vegetation in the Mediterranean area is discussed. Results from photochemical episodes are also reported in terms of physico-chemical evaluation of atmospheric pollutants.
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