都不好,但是 氡气的问题比较容易解决:
Reducing radon in your home
If the radon level in your home is above the Canadian guideline of 200 becquerels/metre³, you need to reduce it. The higher the radon level in your home, the sooner it needs to be reduced.
A certified radon mitigation professional can help provide you with the most effective radon reduction solution.
One of these solutions is a commonly-used method known as sub-slab depressurization. A pipe is installed through the foundation floor and is piped to the outside with a small fan attached, which draws the radon from under the house and pushes it back outside, before it can enter your home. This solution can reduce the radon level in a home by more than 90%.
Increased ventilation and sealing of radon entry points can also help reduce radon levels, but these solutions may not be as effective as sub-slab depressurization.