Radon is a naturally occurring radioactive gas and a leading cause of lung cancer. Most of Colorado is in Radon Zone 1, which has the highest level of radon risk. While the City and County of Denver does not require radon testing, the U.S. EPA recommends installing a mitigation system if a home exceeds four picocuries per liter (4 pCi/L) of radon gas and using radon-resistant construction techniques in new structures.
Learn more from the new
Measuring and Mitigating Radon in Colorado technical guidance document available from
the state's radon website.
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