In the United States, you may locate a contractor qualified to remove radon by contacting your local Environmental Protection Agency office (find your regional office by going to the EPA Web site www.epa.gov/iaq/whereyoulive.html) or by calling the National Radon Hotline at 1-800-SOS-RADON (1-800-767-7236). The contractor should be able to show you a certification from a national radon proficiency program demonstrating that he or she has gone through special training to remove or reduce radon levels in your home or office.

Most countries have agencies that provide information about environmental protection. Contact your local environmental agency for more information about radon exposure in your area.