Which temporary building conditions can cause inaccurate radon test results?

The correct answer encompasses all the mentioned conditions, as each can significantly impact the accuracy of radon test results.

Severe weather can alter normal airflow and pressure dynamics within a building, affecting the radon levels detected during testing. High winds or heavy rainfall can lead to changes in air pressure that either enhance or reduce radon entry into the home, skewing the results.

When a property is vacant during testing, it may not reflect typical occupancy conditions. Normal activities, such as heating, cooling, and ventilation, change the air exchange rates within the building, which can lead to variations in radon concentration that would not be present in a regularly occupied setting.

Noncompliance with required testing conditions, such as keeping windows and doors closed or maintaining a stable indoor temperature, can also lead to unreliable readings. Testing must adhere to specific protocols outlined by organizations such as the EPA to ensure that results are valid and representative of the property's radon exposure levels.

Considering the cumulative impact these conditions can have on radon testing, it's clear that all the factors outlined can contribute to inaccurate test results.