Which radioactive gas is primarily responsible for lung cancer in non-smokers?

Radon is the radioactive gas primarily responsible for lung cancer in non-smokers. This is because radon, a naturally occurring gas produced from the decay of uranium in soil, rock, and water, can accumulate in homes, particularly in basements and low-lying areas. When inhaled, radon decay products can damage lung tissue, leading to an increased risk of lung cancer over time.

Research has shown that radon is the second leading cause of lung cancer overall, following smoking, and is particularly concerning for non-smokers who may be exposed to high levels of this gas without any other risk factors. Understanding the risks associated with radon exposure is crucial for effective health and safety measures in homes and buildings. This understanding drives the importance of radon measurement and mitigation practices, particularly in areas known to have high natural radon levels.

In contrast, the other gases mentioned—xenon, argon, and neon—do not pose the same health risks related to lung cancer as radon. They are inert gases that do not have the same radioactive properties or mechanisms of harm associated with lung cancer.