What is the first step in determining if a testing location is appropriate for radon mitigation?

The first step in determining if a testing location is appropriate for radon mitigation involves ensuring that the testing device is placed in an appropriate room. This is crucial because the location of radon testing directly influences the accuracy of the results. A radon testing device needs to be placed in a room that is regularly occupied, as it reflects the true radon exposure levels that occupants would experience. Ideally, this should be a basement or lowest level of the home, which is often where radon concentrations are highest due to its origin from the ground.

Choosing an appropriate room also involves considering factors such as ventilation and the use of the space, as these can affect radon levels. For example, placing a testing device in a bathroom or laundry room may not provide an accurate representation of radon levels, as these areas typically have lower occupancy and may be more ventilated.

Other options, while related to aspects of radon mitigation and testing, come into play after confirming the initial location is suitable. Identifying barriers to sub-slab communication, recognizing sub-slab hazards, and estimating airflow needs are essential for effective mitigation strategies, but they are secondary considerations that depend on site appropriateness first being established.