42 U.S. Code § 4907 - Labeling
The Administrator shall by regulation designate any product (or class thereof)—
(b) Manner of notice; form; methods and units of measurement
For each product (or class thereof) designated under subsection (a) of this section the Administrator shall by regulation require that notice be given to the prospective user of the level of the noise the product emits, or of its effectiveness in reducing noise, as the case may be. Such regulations shall specify
(1) whether such notice shall be affixed to the product or to the outside of its container, or to both, at the time of its sale to the ultimate purchaser or whether such notice shall be given to the prospective user in some other manner,
(3) the methods and units of measurement to be used. Section 4905 (c)(2) of this title shall apply to the prescribing of any regulation under this section.