Where:
RGHG = The usage rate for a particular cover or carrier gas over the period of comparable operation (metric tons gas/metric ton Mg).
CGHG = The consumption of that cover or carrier gas over the period of comparable operation (kg).
Mg = The magnesium produced or fed into the process over the period of comparable operation (metric tons).
0.001 = Conversion factor from kg to metric tons.
40 C.F.R. §98.205