Question 27

Radon is a radioactive odorless gas which may require mitigation.

Radon is a naturally occurring radioactive gas that can accumulate in homes and buildings, posing health risks if not properly mitigated.

A) radon

Radon is indeed a radioactive gas that is colorless and odorless, making it difficult to detect without specialized equipment. It can seep into homes from the ground and accumulate in enclosed spaces, often requiring mitigation measures such as ventilation systems to reduce exposure levels.

B) asbestos

Asbestos is a group of minerals known for their fire-resistant properties, but it is not a gas. It poses health risks primarily through inhalation of fibers, leading to diseases such as asbestosis and mesothelioma, but it does not require mitigation in the same way that a gas like radon does.

C) formaldehyde

Formaldehyde is a colorless gas with a strong odor, often found in building materials and household products. While it can pose health risks and may require mitigation, it is not classified as a radioactive gas, thus making it an incorrect choice for this question.

D) carbon monoxide

Carbon monoxide is a colorless, odorless gas that can be produced by burning fossil fuels. While it is toxic and can require mitigation in the form of detectors and proper ventilation, it is not a radioactive gas, which disqualifies it from being the correct answer.

Conclusion

Radon is uniquely identified as a radioactive, odorless gas that necessitates specific mitigation strategies to safeguard health. In contrast, all other options listed either do not pertain to radioactivity or do not fit the description of being a gas, thus confirming radon as the definitive correct answer.