Forests represent approximately 40 % of the territory of Slovakia. Due to long-term loading of high concentration of various types of immissions their state of health is strongly damaged, in 1985 85 % of forests showed the symptoms of damage. The improvement of the state of forest stands in Slovakia is related to reduction not only of emissions but also to their decrease in neighbouring and remote countries. Except of the mentioned reduction of emmissions is necessary to know the air quality of forest stands for effective measures. Proposals carried out up to the present were rather optimistical and conformed to former political system. It may be summed up that basic changes of acid immission types will not occurred.