Subchapter III. Indoor Radon Abatement 15 U.S. Code §2661. National goal 15 U.S. Code §2662. Definitions 15 U.S. Code §2663. EPA citizen's guide 15 U.S. Code §2664. Model construction standards and techniques 15 U.S. Code §2665. Technical assistance to States for radon programs 15 U.S. Code §2666. Grant assistance to States for radon programs 15 U.S. Code §2667. Radon in schools 15 U.S. Code §2668. Regional radon training centers 15 U.S. Code §2669. Study of radon in Federal buildings 15 U.S. Code §2670. Regulations 15 U.S. Code §2671. Additional authorizations