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How does radon typically enter buildings?

  1. Through plumbing systems

  2. Via electrical outlets

  3. Through air pressure and temperature differences

  4. By contamination from nearby factories

The correct answer is: Through air pressure and temperature differences

Radon typically enters buildings through air pressure and temperature differences because it is a naturally occurring radioactive gas that is produced from the decay of uranium in soil and rock. As radon is released from the ground, it can move through the soil and into the atmosphere. When buildings are constructed, they can create a difference in air pressure between the interior and exterior. These pressure differences can draw radon gas into the building through cracks in the foundation, gaps around pipes, or other entry points. This process is influenced by factors such as the design of the building, the type of foundation, and how airtight the structure is. Additionally, temperature variations, like those occurring in winter when buildings are heated, can exacerbate this effect since warm air rises, which may pull radon in from the ground. Understanding these mechanisms helps in recognizing the importance of radon testing and mitigation in buildings, especially in areas known for higher radon levels.