What weather conditions can lead to sudden increases in radon levels?

High winds or local storms can lead to sudden increases in radon levels because these conditions can cause changes in atmospheric pressure. Radon gas, which is naturally occurring and comes from the decay of uranium in soil and rock, can be drawn into homes through cracks in foundations, construction joints, and other openings when the outside air pressure drops.

During high wind events or storms, the pressure differences can create a vacuum effect that facilitates the entry of radon from the ground into buildings. This phenomenon is especially noticeable in tightly sealed homes, where normal ventilation is reduced. As a result, residents may experience spikes in radon levels during or immediately following such weather events.

Other weather conditions, like heavy rainfall or floods, can also temporarily influence radon levels by saturating the ground and changing how radon moves through the soil. However, these conditions typically lead to a decrease in radon levels as water can fill spaces in the soil through which radon would normally migrate. Sunny and clear days generally do not alter the atmospheric pressure in a way that would cause sudden increases in radon levels. Freezing temperatures can create stable air conditions, which also do not promote radon entry into homes.