NO X , CO, and VOC Emission Standards for Stationary Non-Emergency SI Engines ≥100 HP (Except Gasoline and Rich Burn LPG), Stationary SI Landfill/Digester Gas Engines, and Stationary Emergency Engines >25 HP

Engine type and fuel Maximum engine power Manufacture date Emission standards a g/HP-hr ppmvd at 15% O 2 NO X CO VOC d NO X CO VOC d Non-Emergency SI Natural Gas b and Non-Emergency SI Lean Burn LPG b 100≤HP<500 7/1/2008 2.0 4.0 1.0 160 540 86 1/1/2011 1.0 2.0 0.7 82 270 60 Non-Emergency SI Lean Burn Natural Gas and LPG 500≤HP<1,350 1/1/2008 2.0 4.0 1.0 160 540 86 7/1/2010 1.0 2.0 0.7 82 270 60 Non-Emergency SI Natural Gas and Non-Emergency SI Lean Burn LPG (except lean burn 500≤HP<1,350) HP≥500 7/1/2007 2.0 4.0 1.0 160 540 86 HP≥500 7/1/2010 1.0 2.0 0.7 82 270 60 Landfill/Digester Gas (except lean burn 500≤HP<1,350) HP<500 7/1/2008 3.0 5.0 1.0 220 610 80 1/1/2011 2.0 5.0 1.0 150 610 80 HP≥500 7/1/2007 3.0 5.0 1.0 220 610 80 7/1/2010 2.0 5.0 1.0 150 610 80 Landfill/Digester Gas Lean Burn 500≤HP<1,350 1/1/2008 3.0 5.0 1.0 220 610 80 7/1/2010 2.0 5.0 1.0 150 610 80 Emergency 25<HP<130 1/1/2009 c 10 387 N/A N/A N/A N/A HP≥130 2.0 4.0 1.0 160 540 86 a Owners and operators of stationary non-certified SI engines may choose to comply with the emission standards in units of either g/HP-hr or ppmvd at 15 percent O 2 . b Owners and operators of new or reconstructed non-emergency lean burn SI stationary engines with a site rating of greater than or equal to 250 brake HP located at a major source that are meeting the requirements of 40 CFR part 63, subpart ZZZZ, Table 2a do not have to comply with the CO emission standards of Table 1 of this subpart. c The emission standards applicable to emergency engines between 25 HP and 130 HP are in terms of NO X + HC. d For purposes of this subpart, when calculating emissions of volatile organic compounds, emissions of formaldehyde should not be included. [76 FR 37975, June 28, 2011]