Ensuring appropriate environmental quality and protecting it as a necessity for survival and progress is a matter of significant and current concern for social development. The primary objectives are to adopt solutions to reduce pollution and enhance overall environmental quality. Pesticides are chemical substances used in agriculture to control plant pests and diseases. Despite their toxicity and health repercussions, global pesticide consumption continues to rise. Each year, over 200,000 tons of pesticides are used in Europe to combat agricultural diseases, pests, and weeds. These substances are foreign to the ecosystem, toxic, and, therefore, should be used rationally and never abusively. Unfortunately, these chemicals can have negative effects on the health of both adults and children. Hence, with the widespread use of pesticides, their impact on human health increases, prompting a need for deeper study. This scientific article explores the impact of the pesticide "Decis" on the health of animals, plants, humans, and the environment. Researching the blood of experimental animals is one of the primary methods used to characterize the functional state of the study subject because hematopoietic organs are quite sensitive to various pathological conditions that are reflected in hematological indices. The normal composition of blood is essential for the proper functioning of the body. Laboratory studies have highlighted that the pesticide "Decis," containing deltamethrin as the active ingredient, can have a negative impact on the blood composition in animals. Deltamethrin is a pyrethroid compound, a class of synthetic pesticides that act on the nervous system of insects. The impact of the "Decis" pesticide on the blood composition in animals is a topic of great importance in the field of animal health and environmental protection. The impact of pesticides entering the human body in doses that do not exceed hygienic standards sparks conflicting discussions today, necessitating a more detailed study of these aspects. Therefore, it is necessary to correctly define the doses used, the principles, and general action directions for monitoring pesticide use and raising public awareness of the health risk presented by their residues in harvested food products, as they can irreversibly degrade and damage the body's functions. Deviation from the established norms of red blood cell count, white blood cell count, hemoglobin levels, and the rate of erythrocyte sedimentation due to the influence of "Decis" informs us about the body's condition under the influence of the harmful agent. Changes observed in the blood composition of animals exposed to pesticides may indicate the presence of serious conditions such as anemia, inflammation, and immune system dysfunction. These results underscore the need for precautionary measures and strict rules for pesticide use in agriculture, as well as the correct determination of doses to protect not only humans but also animals and the surrounding environment.