The microenvironment ozone concentrations in the coastal region of Slovenia and inlands have been assessed with diffusive samplers. Two different types of diffusive samplers were used for this purpose and results compared to evaluate the method. Cumulative concentrations of ozone were well correlated with average concentrations obtained at reference stationary measuring site. Diffusive samplers appear to be suitable for field use to measure ambient ozone concentration as a part of an indicative air quality monitoring program. The advanteges of the method are its simple use and cost-effectivness in comparison with automatic measuring stations. The sites exposed to elevated traffic showed the lowest levels of ozone, in average 80 μg/m3. Medium levels were measured in elevated areas with values between 80 and 120 μg/m3. Highest levels of ozone, between 120 and 180 μg/m3, were measured in higher, non-polluted areas open to the sea.