If you regularly have high degrees over a period of time, or if you get an outcome above 4.0 pCi/L in summer season, you more than likely demand radon mitigation. The EPA approximates the life time threat of radon-induced lung cancer cells for never-smokers at 7 per 1,000 individuals, compared to 62 per 1,000 for cigarette smokers revealed to a level of 4 pCi/L. Your risk rises with your direct exposure to radon as well as cigarette smoke with time. Short-term detectors step radon levels for 2 days to 90 days, depending upon the tool.