The aim of the diploma thesis is participation in the 4th cycle of data collection on the species composition of vegetation in areas of intensive monitoring. The aim is also to evaluate the development of vegetation over 20 years, in the context of observed changes in the sites. Data collection has been performed every five years, since 1999. It was performed gradually at TMPs distributed throughout Slovakia within the ICP Forests program. These were the following areas: 201 Čifáre, 203 Lomnistá, 204 Poľana-Húkavský grúň, 206 Turová, 207 Tatranská Lomnica, 208 Svetlice, 210 Grónik, 211 Žibritov a 212 Železnô. The size of the deposition increases with altitude and is related to the annual total precipitation. Of the monitored areas, the largest disturbance affected the area 206 Turová, which was hit by the wind calamity Žofia in May 2014. The area of Čifáre was affected by anthropogenic activity, and therefore the number of shrubs gradually decreased here. In the area in Lomnistá, we recorded an increased occurrence of nitrophilous species, which suppressed the occurrence of oligotrophic ones. The increased amount of nitrogen deposition was also confirmed by soil analysis. There are a large number of shrubs in the Poľana area. Svetlice locality, which lies in the north-eastern part of the country, is a characteristic beech forest with low herb cover. The area in Tatranská Lomnica is an alpine area with many acidophilic species. The plants in this area are demanding to moisture and have a high tolerance to acidic soils. The area of Grónik is characterized by high acidity soils. Soil analyzes show sulfur values of up to 9 kg.ha-1 and the number of species in this area is the lowest of all. Železnô area, which is located in the Low Tatras, is the area with the second lowest number of species. Over time, acidity on it increases. The area of Žibritov is a representative of oaks. Typical for these localities are thermophilic species with lower demands on humidity. This is the area with the largest number of species. Although the individual areas are geographically different, together they are affected by the deposition of nitrogen and sulfur.