What is radon?

Radon is a naturally-occurring gas produced by the radioactive decay of the element radium. Radon itself is radioactive because it also decays to form the element polonium. Polonium is also radioactive - it is this element, which is produced by radon in the air and in people's lungs, that can hurt lung tissue and cause lung cancer.

Radon is ubiquitous (usually in small amounts) in rock and soil and can be carried in water, air, and in natural gas. Some rock types have the potential to produce higher than average amounts of radon gas.

 

Learn more:  

The Geology of Radon