Environmental chemistry studies the chemical processes that occur in the environment and their impact on ecosystems. It helps in pollution control by identifying pollutants, understanding how they interact with natural systems, and finding ways to mitigate their harmful effects. For instance, environmental chemists develop technologies to reduce emissions from industrial processes, clean up oil spills, or remove harmful chemicals from water through filtration and chemical treatments. By understanding the chemical behavior of pollutants, it becomes possible to develop more effective strategies to reduce environmental harm.