Title 40 presents regulations governing care of the environment from the 14 subchapters of Chapter I and from the provisions regarding the Council on Environmental Quality found in Chapter V. Programs addressing air, water, pesticides, radiation protection, and noise abatement are included. Practices for waste and toxic materials disposal and clean-up are also prescribed. Additions and revisions to this section of the code are posted annually by July. Publication follows within six months.

The CFRs are authored by the Office of the Federal Register.