When did the NSPS regulations go into affect for new engines?
The final rule was passed on January 18, 20008 and affected new small natural gas and lean burn LPG engines with a manufacturer’s date of July 2008 and later. Other engines must meet NSPS standards within the next few years with manufacturer’s dates between 2009 and 2011. Some re-manufactured engines must also comply with NSPS. Rulings concerning retrofitting older spark-ignited engines are expected to be discussed in 2009. To find the emission standards that apply to your specific engine, refer to the NSPS final ruling at: http://www.epa.gov/ttn/atw/area/fr18ja08.pdf.
