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Under this bill, anyone who installs, repairs, maintains, cleans, replaces, sells, or vents a radon mitigation system — the equipment used to reduce dangerous radon gas levels in buildings — must complete state-required training and certification before doing that work, and employers must ensure their workers are certified before starting. The state division overseeing construction trades can waive the certification requirement for individuals working directly under a certified professional's one-to-one supervision.