Large Spark-Ignition (LSI) Engine Fleet Requirements Regulation

This page last reviewed May 11, 2018


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Guidance Documents and Advisories


The Large Spark-Ignition (LSI) Engine Fleet Requirements Regulation applies to operators of forklifts, sweeper/scrubbers, industrial tow tractors, and airport ground support equipment (GSE).  These vehicles are found in industries as diverse as manufacturing, wholesale, transportation and utilities, retail, services, and construction.  The 2006 LSI rulemaking and 2010 amendments required operators of in-use fleets to achieve specific hydrocarbon (HC) + oxides of nitrogen (NOx) fleet average emission level (FAEL) standards that became more stringent over time, the lowest FAEL for large and medium fleets was to be achieved in 2013.  The 2016 amendments require operators of in-use fleets to report, label LSI equipment, and continue existing recordkeeping requirements previously set to expire June 30, 2016.  The regulatory language and information on reporting and compliance tools can be accessed by clicking the quick links buttons above.  For additional information, please contact the DOORS Hotline at (877) 59DOORS (877-593-6677), or email doors@arb.ca.gov 


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