Radiation exposure is another significant environmental factor in cancer development. Ionizing radiation, such as that from X-rays, radon gas, and radioactive materials, can damage DNA and lead to cancer. For instance, radon exposure is a leading cause of lung cancer in non-smokers. Non-ionizing radiation, such as UV radiation from the sun, is a major cause of skin cancer, including melanoma. Protective measures, such as using sunscreen, limiting sun exposure, and testing homes for radon, can mitigate these risks.