What commonly indicates a property with dangerous levels of radon?

Household detection kits are a practical tool used by homeowners to identify the presence and levels of radon gas within their properties. These kits are specifically designed to be user-friendly and can be placed in various areas of the home to measure radon concentrations over time. If the kits indicate elevated levels of radon, it serves as a clear sign that the property may have dangerous levels of this gas, which is known to pose health risks, including lung cancer.

While professional inspections and environmental assessments are also valuable in assessing various aspects of real estate, household detection kits offer immediate feedback and ease of use for the homeowner. Real estate appraisals, on the other hand, do not typically focus on environmental hazards such as radon, as their main purpose is to determine a property's market value based on factors like location, size, and condition. Hence, the household detection kits are the most direct method to indicate dangerous radon levels in a property.