Which of the following substances is tasteless, colorless, and odorless and is second to cigarette smoking as the leading source of lung cancer?

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Radon is a naturally occurring radioactive gas that is tasteless, colorless, and odorless. It can seep into homes and buildings from soil, rocks, and water sources and accumulate to dangerous levels. According to the Environmental Protection Agency, radon exposure is the second leading cause of lung cancer, responsible for an estimated 21,000 deaths yearly in the United States. Asbestos and formaldehyde are also known carcinogens, but they have taste, odor, and sometimes color. Methane is a flammable gas that is not directly associated with lung cancer.

Which of the Following Substances Is Tasteless, Colorless, and Odorless