What major regulation aims to control emissions from refrigerants?

The correct regulation that aims to control emissions from refrigerants is the Clean Air Act. This act establishes the framework for regulating air emissions from stationary and mobile sources, with a specific focus on substances that deplete the ozone layer, including certain refrigerants classified as ozone-depleting substances (ODS).

Under the Clean Air Act, the Environmental Protection Agency (EPA) is empowered to enforce regulations that limit the release of harmful substances into the atmosphere, which is particularly relevant for refrigerants such as chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs). These refrigerants, when released, can contribute to ozone depletion and climate change, so the Clean Air Act includes measures for their phase-out and control.

The other options do not specifically target refrigerant emissions: the Clean Water Act focuses on water pollution; the Resource Conservation and Recovery Act addresses the management of hazardous waste; and the National Environmental Policy Act governs environmental impact assessments for federal projects.