The diploma thesis deals with the influence of dangerous substances in electric aparatus on environment and also on human. The aim of this diploma thesis is to describe toxicological characteristics of dangerous substances in electric apparaus and to find out people´s awareness about electro apparatus hazardousness and electric waste by mean of questionnaires. The thesis first descibe the laws concerning this problem either from the view of dangerous substances or from the view of dangerous waste. Furthermore in the thesis the data taken out of two age groups by questionnaires were elaborated. The questionnaires were focused on the knowledge of dangerous substances and dangerous waste. Toxicological characteristics of dangrous metals are also descbibed in this part.