The coursebook presents materials on modern environmental monitoring. Classifications of monitoring, definitions and programs are under consideration. Methods and principles of monitoring organization are given. Monitoring of certain natural environments is discussed on the basis of different instructive materials, methodical recommendations and standards. Brief description of investigation and analytical methods for monitoring organization are also introduced. The coursebook is intended for students and masters of ecological specialties, but could be quite useful for lecturers, students and experts who call themselves “environmentalists” and are interested in speaking on the problems of ecology, geoecology and environment.