Storage,  processing  and  use  of  dangerous  substances,  which  are  present  in  the economic  activity,  involve  risk  of  occurrence  of  major  industrial  accidents.  According to the experience of recent history the accidents could result in catastrophic effects on environment  of  dangerous  establishment  and  citizens  living  there.  A  discussion  about some  events,  which  caused  serious  environmental  impact  and  a  short description  and evaluation about the environmental risk assessment methods are given.