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Including measurements of radon gas levels in the basement or ground floor is essential during home inspections because these areas are typically where radon gas accumulation occurs. Radon is a colorless, odorless gas that can seep into homes from the surrounding soil, and it often becomes trapped in lower levels, such as basements or ground floors, particularly in areas with high radon concentrations.

Measuring radon levels in these areas provides a better understanding of the potential health risks associated with long-term exposure, as radon is linked to lung cancer. Testing at the basement level allows inspectors to assess whether remediation measures are necessary to reduce radon levels and ensure a safer living environment.

In contrast, testing in areas such as attics or engaging in a visual inspection for cracks may not provide accurate data regarding radon exposure since these areas are less likely to gather significant radon concentrations. Additionally, while carbon monoxide testing can be important for overall air quality and safety, it is not directly related to radon concerns and therefore does not address the specific risks associated with radon exposure.