How do radon concentrations vary?

Radon concentrations can indeed vary significantly from house to house due to a number of factors that influence the accumulation of radon gas in buildings. These factors include the geological composition of the area, the construction characteristics of the home, and ventilation practices. For example, homes built on granite or uranium-rich soil may have higher radon levels than those in areas with less radon potential in the soil. Additionally, differences in basement configurations, drainage, and foundation types can lead to variations in radon levels within neighboring homes.

While radon levels can also differ from state to state due to regional geological conditions, the specific characteristics of each individual house frequently result in greater variability in radon concentrations. Seasonal changes and outdoor temperature can influence radon levels as well but are not as direct as the structural differences from one home to another. For example, radon levels may fluctuate seasonally, often increasing during winter months when homes are more tightly sealed, yet this variation is still largely dependent on the unique characteristics of each individual home.

Therefore, the observation that radon concentrations vary from house to house emphasizes the importance of testing for radon in each specific location, rather than making assumptions based on geographic or seasonal patterns.