Tropospheric ozone is the main cause of photochemical air pollution and is harmful to people and the environment. Its concentration depends on the primary pollutants, precursors, from which ozone is produced as a secondary pollutant. Ozone concentrations in the lower layer of the troposphere are analyzed and presented as hourly, daily and monthly averages of ozone concentrations for 2013, for selected measuring stations along the Adriatic coast - Višnjan, Polača, Hum, Opuzen and Žarkovica. Dependence of ozone concentration on wind direction it has been observed as well. An annual cycle of ozone has been confirmed at all sites on the basis of the presence of diurnal average ozone concentration. High concentrations of ozone during the summer months are associated with seasonal high temperatures, and with increased concentration of primary pollutants connected to number of tourists. Comparing the ozone concentration with meteorological parameters such as temperature, relative humidity, wind speed and direction, it has been found that ozone is positively correlated with temperature and negatively correlated with the relative humidity. In accordance with teacher preparation requirements, a unit plan "The Ozone" has been prepared. Students need to know physical properties of ozone and how it is prepared in laboratory, to explain the formation of ozone in the troposphere and stratosphere and be aware of the importance of preserving the environment and nature.