高压线现在的确没定论。。没有REGULATION...
但对RADON GAS,就这两年有REGULATION, TARION现在都COVER了(since 2013?)。。买新房的特别是买热狗老大力推的高尚住宅区的,要注意这个WARRANTY。。RADON来自石头,新炸的石头。。。没什么可怕,只要抽走就行。。
Over the last few years, exposure to radon gas as a potential concern for new
home buyers has received heightened media attention. Health Canada issued
a report in 2012 ---- suggesting that up to 16% of lung cancer cases could be
attributed to long term exposure to radon gas. Their Guideline levels were
lowered in 2007 from 800 Bq/m3 to 200 Bq/m3.
http://mr-radon.ca/wordpress/wp-content/uploads/2013/08/TARION-Warranty-RADON.pdf