StacksVerified U.S. regulatory reference

40 CFR Part 63, Table 4

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov
Number of furnacesEmission limit (lb/ton of anode)
TFPOM | PM
20.11 | 0.17 | 0.11
30.09 | 0.17 | 0.091
40.077 | 0.17 | 0.076
50.07 | 0.17 | 0.071

[80 FR 62424, Oct. 15, 2015]