Advanced oxidation is a water treatment process that uses powerful oxidants to break down pollutants and contaminants. This method often involves the generation of hydroxyl radicals, which are highly reactive and can effectively degrade organic compounds, including those that are difficult to remove through conventional methods. Common techniques for advanced oxidation include ozonation, Fenton's reagent, and photocatalysis. These processes are used in various applications, such as wastewater treatment and air purification, to improve environmental quality and ensure safer water and air for human health and ecosystems.