Since 2014, the C-NRPP has recommended conducting a long-term test with a Health Canada-approved dosimeter during a real estate transaction in Quebec if no recent radon test is available. However, this recommendation is difficult to apply during a real estate transaction:

• Impossibility or complexity related to the feasibility of a 3-month long-term test within the timeframe of a real estate transaction: everything moves too fast, properties are snatched up quickly.
• It's possible to use a temporary holdback clause to validate the presence or absence of radon, but few brokers are keen on such a clause, not to mention sellers.
• Not a common practice in the real estate field currently, but that could change soon.
• An alternative: a short-term radon test of 4 to 10 days that can provide an overview and guidance for the buyer.

This recommendation to test for radon is aimed at buyers, but also at sellers and multi-dwelling owners.