Testing basement areas alone, for example, will not reflect your exposure risk in above ground living areas, such as second story bedrooms. It is essential to remember that radon levels should simply guide you to further rational choices, especially considering whether you smoke or not. Quitting smoking would also help, of course. If still above 4, repairs are probably best indicated. Test results above 10 mean that you should have your home fixed as soon as possible.
Radon exposure is similar to many environmental health risks.
There is a potential for a serious problem. Radon is real. But radon is also part of a natural process. By learning as much as you possibly can from reliable information sources about radon and radon exposure, you will be able to make a calm and informed decision about what steps you will need to take, if any. Safe Drinking Water Act Amendments required EPA to establish several new, health-based drinking water regulations.