In consideration of the ubiquitous presence of pesticides in the environment, research should be done for each new compound aimed at evaluation of the hazard resulting from its application. Environmental investigations conducted in Poland encompass research on: (a) abiotic transformations (hydrolysis, photodegradation), (b) metabolism in plants and animals, as well as the fate in aquatic and soil environments; (c) influence on biota (including microflora, honey-bee and other beneficial arthropoda, aquatic organisms, birds); (d) side effects (bioaccumulation, resistance, subsequent action of sublethal amounts on populations); (e) mechanisms of action; (f) biological survey of sewage. The data obtained make possible an evaluation of risk connected with application of the investigated compound.