What is radon, and do I need to worry? We asked an expert about the cancer-causing gas and its risks — plus how you can test for it in your home yourself

AI Briefing

• – Radon is a radioactive gas that can cause lung cancer, and it's present in every home. Long-term exposure is considered a cancer risk, and testing is recommended to determine if levels are above safe limits. You can test for radon in your home using a DIY kit or hiring a professional.