Radon is about 7.5 times heavier than air but is easily influenced by air movements and pressure. In homes with forced air heating and cooling, radon can spread throughout the entire house. However, when a radon mitigation system releases the gas above the roof, its concentration drops significantly just 3-4 feet away from the discharge point, nearing background levels. The Environmental Protection Agency banned ground-level discharge mainly to prevent the gas from re-entering homes and to protect children from high radon exposure. At the discharge point, radon levels can reach tens of thousands of picocuries per minute.
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https://standardwater.com/services/radon-mitigation/