According to the report of the Communications and International Affairs Department of the Arak Metropolis Municipality, in order to combat the environmental and health crisis caused by the increase in the population of pests, operational teams of the Arak Metropolis Municipality have implemented a new phase of the population control plan in a specialized manner within the urban river boundaries. This precise action has focused on areas that, due to their proximity to water and the accumulation of waste, are considered breeding and activity centers for these animals. The use of special baits designed with the wet conditions of the river environment in mind is the main goal of this operation to prevent the spread of secondary pollution. Controlling the population of these animals in the riverbeds is a priority during this period, as these animals can transfer pollution to other parts of the city through flowing water channels. This organization has also asked citizens to report any waste disposal in the river boundaries to the organization so that control measures can be carried out more effectively in all areas.