What type of hazardous substance is radon classified as?

Radon is classified as a gas because it is a naturally occurring radioactive gas that is produced from the decay of uranium found in soil and rock. It is colorless and odorless, making it difficult to detect without specialized equipment. The classification as a gas is significant because it can accumulate in enclosed spaces, such as basements and poorly ventilated areas, leading to health risks, particularly lung cancer, when inhaled over long periods. Understanding this classification is crucial in real estate as it helps inform buyers and sellers about potential health hazards in properties, leading to necessary testing and mitigation strategies. This underscores the importance of awareness concerning radon levels in homes.