The article deals with the first results of monitoring of tropospheric ozone damage, observed as foliage damage on the selected forest tree and shrub species in Slovenia at the plots of ICP-Forest Level II. Foliage damage was accompanied by ozone concentration measurement, carried out by passive samplers. The first results of the monitoring showed that higher ozone concentrations were measured in the west and south-west part of the country, especially at higher elevations. Foliage damage does not always correlate withthe ozone concentration due to the interference of climate factors and water regime of plants. However, typical visible damage was found in needles and leaves of almost all observed tree and shrub species. Due to the method of monitoring we have not been able to correlate measured ozone concentrations and visible injuries in plant leaves.