[header] How to limit home radon exposure [title] Find a qualified contractor. [step] Limiting radon in your home will take someone with training and knowledge in mitigation techniques. Ideally, look for a contractor certified by the national radon proficiency program (nrpp) or the national radon safety board (nrsb). 
These are the only two national organizations in the us that certify radon professionals. [substeps] The us environmental protection agency (epa) suggests that people hire contractors who certified nationally or on the state level.