40 CFR § 98.202 - GHGs to report.

(a) You must report emissions of the following gases in metric tons per year resulting from their use as cover gases or carrier gases in magnesium production or processing:

(1) Sulfur hexafluoride (SF6).

(2) HFC–134a.

(3) The fluorinated ketone, FK 5–1–12.

(4) Carbon dioxide (CO2).

(5) Any other GHGs (as defined in § 98.6).

(b) You must report under subpart C of this part (General Stationary Fuel Combustion Sources) the CO2, N2O, and CH4 emissions from each combustion unit by following the requirements of subpart C.