Continuous Radon Monitor Ridge

After years of testing homes in St. Louis, I have seen the same story play out too many times. A family buys a short-term radon test kit from the hardware store, leaves it in the basement for three days, and sends it off to a lab. The result comes back below the EPA action level, so they assume everything is fine. Six months later, after a renovation that changes how air moves through the house, radon levels spike. That single snapshot in time never told the full story. Tha