Transport Refrigeration Unit
Transport Refrigeration Units (TRU) that fall under this measure are refrigeration systems powered by diesel internal combustion engines designed to refrigerate or heat perishable products that are transported in various containers, including truck vans, semi-truck trailers, shipping containers, and railcars. Although TRU engines are relatively small, ranging from 9 to 36 horsepower, significant numbers of these engines congregate at distribution centers, truck stops, and other facilities, resulting in the potential for health risks to those that live and work nearby. Since diesel particulate matter (PM) pollutant emissions have been identified as a toxic air contaminant, CARB adopted an Airborne Toxic Control Measure (ATCM) for TRUs, TRU generator sets, and facilities where TRUs and TRU generator sets operate on February 26, 2004 with amendments in 2010 and 2011. Please see more information about this rulemaking at: 2004 TRU ATCM Rulemaking, Rulemaking and Final Regulation Order with 2010 Amendments, TRU Advisory 10-20, TRU ATCM 2011 Regulatory Activity.