Acid depositions begun significantly influence the human environment especially in the last 50 years. The authors give information about damages caused in human environment by these depositions. They come to the conclusion that reduction of the fluctuation of acid depositions – otherwise temporally and financially particular process – may be successful only by mutual combination of the moods and by their optimum choice. First of all it is necessary to try to reduce emmissions of sulphuric and nitrogenous compounds into air and to apply the programme of fight against acidification of human environment on a world scale.