Halomethanes are a group of organic compounds that consist of a methane molecule with one or more halogen atoms, such as chlorine, bromine, or iodine, replacing hydrogen atoms. They are commonly used in various industrial applications, including solvents, refrigerants, and as intermediates in chemical synthesis. These compounds can be found in the environment, often as byproducts of industrial processes or the breakdown of certain pesticides. Some halomethanes, like chloroform and bromoform, are known to have potential health risks, including effects on the liver and kidneys, making their monitoring important for public health.