During which season are indoor radon levels typically highest?

Prepare for the NRPP Radon Mitigation Specialist Exam. Use flashcards and multiple choice questions with hints and explanations. Get ready for your certification!

Indoor radon levels are typically highest during the winter months. This is primarily due to the way homes are heated and the ventilation patterns that occur during that season. During winter, homes are often closed tightly to conserve heat, creating less ventilation and allowing radon, a naturally occurring radioactive gas that can seep into homes from the ground, to accumulate indoors. The lack of airflow and the increased heating result in higher concentrations of radon in indoor air.

In contrast, the other seasons generally allow for more open windows and ventilation, which helps to disperse indoor pollutants, including radon, thereby lowering its concentration. For example, in spring and fall, the weather is often milder, encouraging more natural ventilation, while summer brings the opportunity for open windows and air conditioning to circulate air. These factors contribute to reduced indoor radon levels in those seasons compared to winter.

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