"key findings in the sweeping study included the fact that newer homes, those built within the past 25 years, had 31.5 per cent higher radon levels compared with those built before 1992." y8 s& E+ M! i) H- ^, _7 fhttp://calgaryherald.com/technol ... eight-calgary-homes" M- a8 Q( W) T
craigliu 发表于 2017-11-22 19:53 7 l5 ^* j+ R* _* \; E( B$ }( l"key findings in the sweeping study included the fact that newer homes, those built within the past ...