If you continually have high degrees over a time period, or if you get a result above 4.0 pCi/L in summertime, you most likely requirement radon reduction. The EPA estimates the life time risk of radon-induced lung cancer cells for never-smokers at 7 per 1,000 individuals, compared to 62 per 1,000 for smokers revealed to a level of 4 pCi/L. Your risk increases with your direct exposure to radon and also cigarette smoke over time. Temporary detectors action radon levels for 2 days to 90 days, depending upon the gadget.