Environmental

A Washington homebuyer discovers that the neighborhood has elevated radon levels during a home inspection. Radon mitigation in Washington typically involves:

ARemoving radon by excavating contaminated soil
BSub-slab depressurization systems that vent radon from beneath the foundation✓ Correct
CAdding activated charcoal filters to the HVAC system
DSealing all windows and doors

Explanation

The most effective and common radon mitigation technique is sub-slab depressurization (SSD), which uses a pipe and fan system to draw radon gas from beneath the foundation slab and vent it safely outside before it can enter the home.

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