The monitoring applied in Poland and resulting from international and national regulatons has been discussed in detail. The international monitoring covers: monitoring of the Southern Baltic Sea, an evaluation of the transfer of the polluted air over long distances, monitoring of the land environment against the background level, monitoring of ozone, background monitoring of the Man and Biosphere Programme and monitoring of the air in the regions adjoining the borders. In the system of national monitoring the following questions are discussed: pollution of atmosphere, forest and soil habitat, flowing waters, underground waters and lakes. The monitoring in Poland requires co-ordination and unification of the measuring methods and instruments in the research centres.