What is the evidence that indoor radon exposure is really a health risk?
The earliest evidence of radon-related health risk came from long-term cohort studies of underground miners conducted over the past 60 years.This evidence was of sufficient strength by 1988 that the World Health Organization’s International Agency for Research on Cancer (IARC) classified radon and its short-lived decay products as known human carcinogens (Group 1 or Class A). The National Cancer Institute has led the on-going study of 68,000 international underground miner radon risks. The National Academy of Sciences’ extensive assessment of the miner and other health risks associated with indoor radon is found at Health Risks of Exposure to Radon (BEIR VI). Based upon this report, the U.S. Environmental Protection Agency (EPA) completed the EPA Assessment of Risk of Radon in Homes.