Importers of industrial thermostats, vaccines, and other products that may contain mercury may not be prepared for a coming rule that could require them to report the metal’s import to the EPA, an environmental attorney told Bloomberg BNA Aug. 18.

The scope of industries that would have to report their manufacture, recovery, use, or trade in mercury and the specific information they would have to provide won’t be known until the Environmental Protection Agency proposes the rule, Steven Barringer,...