At what rate do radon levels vary during the day or night?

Radon levels can vary throughout the day and night due to a variety of factors. These factors include temperature changes, atmospheric pressure fluctuations, and the ventilation of buildings. During the day, increased ventilation from opening windows or using exhaust fans can lead to lower radon levels inside buildings. Conversely, during the night, when homes are typically closed up, levels may rise as radon gas can accumulate in indoor spaces.

Additionally, outdoor temperature changes can influence the movement of radon gas from the soil into buildings. On colder nights, for example, the density of the air can cause radon to enter through cracks and openings more readily than during warmer conditions. Therefore, acknowledging that radon levels fluctuate is crucial for accurate assessment and mitigation. Understanding these variations helps establish effective monitoring and mitigation strategies to ensure safe indoor air quality.