If you constantly have high levels over a period of time, or if you get an outcome over 4.0 pCi/L in summer, you most likely need radon mitigation. The EPA approximates the lifetime danger of radon-induced lung cancer cells for never-smokers at 7 per 1,000 individuals, compared with 62 per 1,000 for cigarette smokers exposed to a degree of 4 pCi/L. Your danger rises with your exposure to radon as well as cigarette smoke over time. Temporary detectors procedure radon degrees for 2 days to 90 days, depending upon the device.