StacksVerified U.S. regulatory reference

40 CFR Part 60, Table 2

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov
Engine powerEmission standards for 2008 model year and later emergency stationary CI ICE <37 KW (50 HP) with a displacement of <10 liters per cylinder in g/KW-hr (g/HP-hr)
Model year(s)NOX + NMHC | CO | PM
KW<8 (HP<11)2008 + | 7.5 (5.6) | 8.0 (6.0) | 0.40 (0.30)
8≤KW<19 (11≤HP<25)2008 + | 7.5 (5.6) | 6.6 (4.9) | 0.40 (0.30)
19≤KW<37 (25≤HP<50)2008 + | 7.5 (5.6) | 5.5 (4.1) | 0.30 (0.22)