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Introduction

The analysis of time ozone components (high/low frequency) of the Italian stations of Rome (41.9°N, 12.5°E), Vigna di Valle (42.1°N, 12.2°E) and Ispra (45.8°N, 8.6°E), and the Swiss Arosa (46.8°N, 9.7°E) are investigated in order to single out any effective ozone trend together with the role of ozone fluctuations due to weather patterns.A filtering technique and an advanced statistical methodology are applied to the Dobson ozone long time series of Vigna di Valle and Arosa and to the Brewer ozone data of Rome and Ispra. A sensitivity study of the STAR model for the UV spectral and integrated irradiance in 2040 is performed using different assumptions.