If you continually have high degrees over an amount of time, or if you get a result above 4.0 pCi/L in summer, you probably requirement radon reduction. The EPA estimates the life time threat of radon-induced lung cancer for never-smokers at 7 per 1,000 people, compared with 62 per 1,000 for smokers exposed to a level of 4 pCi/L. Your danger increases with your direct exposure to radon and cigarette smoke over time. Temporary detectors measure radon levels for 2 days to 90 days, relying on the gadget.