As wind speeds increase, the airflow over the building creates pressure differences which in turn encourage soil gas movement into the property. A venturi effect is set up which lowers the pressure over the lee side of the roof drawing air out of the building. In addition a high pressure area is set up on the windward side of the building and in the ground. Thus the pressure difference inside and out is increased as the wind velocity increases. The pressurised air suffuses though the ground and is drawn into the building, any radon present in the soil is drawn along with this air movement and can increase radon concentrations in the building.
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