Environmental chemistry is a branch of chemistry that focuses on the chemical processes occurring in the environment and their impacts on human health, ecosystems, and the planet as a whole. It deals with understanding the sources, reactions, transport, effects, and fates of chemical species in air, water, soil, and living organisms. The core aim of environmental chemistry is to analyze pollutants, understand their transformations, and develop strategies to mitigate their harmful effects. This field combines principles from analytical, physical, inorganic, and organic chemistry to provide a comprehensive understanding of environmental problems and solutions. The scope of environmental chemistry is broad and interdisciplinary. It encompasses the study of natural chemical processes, anthropogenic impacts, and interactions between chemical species and biological systems. Key areas include atmospheric chemistry, which examines pollutants such as ozone, nitrogen oxides, and particulate matter; aquatic chemistry, focusing on chemical interactions in freshwater and marine ecosystems; soil chemistry, which studies nutrient cycles, contamination, and remediation; and toxicology, which evaluates the effects of chemicals on humans and wildlife. Environmental chemistry also plays a crucial role in sustainable development by providing insights into waste management, pollution control, and green chemistry practices that minimize environmental harm. Modern environmental chemists use advanced analytical techniques such as spectroscopy, chromatography, and mass spectrometry to detect and quantify pollutants at trace levels, enabling accurate monitoring and management. A fundamental concept within environmental chemistry is oxidation-reduction, commonly referred to as redox reactions. Redox reactions involve the transfer of electrons between chemical species. Oxidation is defined as the loss of electrons, while reduction is the gain of electrons. These processes are always coupled: when one species is oxidized, another is reduced. Redox reactions are central to many natural and anthropogenic environmental processes, influencing soil chemistry, water treatment, corrosion, and energy production. In environmental chemistry, redox reactions are observed in atmospheric reactions, such as the formation and breakdown of ozone. For example, in the stratosphere, molecular oxygen (O₂) absorbs ultraviolet radiation and dissociates into atomic oxygen, which then reacts