Franklin D. Roosevelt said a long time ago: “A nation that destroys its soil destroys itself. Forests are the lungs of our country, they clean the air and give fresh strength to our people." Air is necessary for life and every individual should do everything in their power to keep the air we all breathe clean. Man, through his actions, has caused many negative consequences that even today contribute to pollution and extreme lowering of air quality. The aim of this work was to assess air quality based on the analysis of hourly validated concentrations of: carbon monoxide, nitrogen oxides, nitrogen dioxide, sulfur dioxide, ozone, particulate matter PM2.5 and PM10 measured in the period from July 7, 2018 to October 1, 2020 at the Plitvice Lakes. The measuring site is located in the village of Čujića Krčevina, about 5 km southeast of Lake Kozjak. Within a radius of 1 - 5 km there are a number of restaurants and hotels, which increases the level of concentration of pollutants that are the result of anthropogenic factors. Natural phenomena such as the flowering of plants, rising dust, seasonal changes in vegetation and other, only temporarily increase the concentration of pollutants in the air. Anthropogenic effects contribute more to the pollution of Plitvice Lakes region. However, the quality of the air there is high.