Can you smell radon gas or see signs of it?

No — radon has no smell, colour, or taste. It’s completely invisible, which makes it impossible to detect without testing. You won’t notice any obvious “signs” that radon is present, as it doesn’t leave stains, residue, or visible damage in a building.

This is why radon is often called the “silent killer” — long-term exposure can increase the risk of developing lung cancer, but most people are unaware it’s there until testing reveals high levels.

The only way to know if your workplace or property has a radon problem is to carry out a radon test, which involves small detectors that measure gas levels over several weeks.