Etilbromida is a chemical that has been used to fumigate soil to kill harmful pathogens. However, etilbromida is toxic and depletes the ozone layer when released into the atmosphere. It has been banned for agricultural use in many countries. Haloalkanes are a class of organic compounds that contain halogen elements like chlorine, bromine or iodine. While some haloalkanes occur naturally in algae and fungi, many are human-made and used in products like solvents, refrigerants and propellants, though some can be toxic or cause environmental damage.