Easy systems of reduction have been revealed to be with the ability of decreasing indoor radon levels by more than 50%. When radon air flow followers are added radon degrees can even be lowered even more. The threat of lung cancer boosts by 16% per 100 Bq/m3 boost in long period of time typical radon concentration. The dose-response relationship is linear-- for example, the danger of lung cancer increases proportionally with increasing radon direct exposure. The lower the radon concentration in a house, the reduced the danger of lung cancer cells as there is no recognized threshold listed below which radon direct exposure brings no threat.