In 2009 Health Canada conducted a two-year study of radon concentrations in homes across Canada. This study found that:
Approximately 7% of homes have high levels of radon
Radon levels vary significantly across the country
There are no areas of the country that are 'radon free,' but there are areas of the country where high levels of indoor radon are more prevalent
7%的房屋有高氡气问题
全国没有无氡气区