; and (B) determining the appropriate measurement of any covered product (as described in section 4691(c)). (2) Pollution intensity calculations (A) In general Not later than 18 months after the date of enactment of this subchapter, the Secretary shall publish a final rule establishing— (i) in a manner consistent with section 4693, the pollution intensity with respect to each covered product and country of origin, and (ii) methods for any foreign country to establish an alternative pollution intensity with respect to any covered product pursuant to subsection (f) of such section. (B) Circumvention Not later than 36 months after the date of enactment of this subchapter, the Secretary shall publish a final rule to address producers described in section 4693(g). (3) Establishment of variable charges Not later than 24 months after the date of enactment of this subchapter, the Secretary (in consultation with the United States Trade Representative) shall issue a final rule establishing the variable charge for covered products for purposes of section 4692. (4) Additional rulemaking In addition to the rules described in paragraphs (1) through (3), any rules which are necessary in order to properly apply the fee under section 4691 shall be issued not later than the date which 24 months after the date of enactment of this subchapter. (c) Reassessment (1) In general Not later than 3 years after the date of the issuance of any final rule described in subsection (b), and every 3 years thereafter, the Secretary shall reassess and, as necessary, issue a final rule to adjust, the existing final rule. (2) Revision The United States International Trade Commission, in consultation with the Secretary, shall annually publish a notice reflecting headings, subheadings, and statistical reporting numbers of the HTS contained in any rule issued under this section which need to be amended due to revisions to the HTS. (3) Newly available data With respect to any reassessment described in paragraph (1), the Secretary may utilize any data