Sioux City-Terra Industries Inc. said March 9 that Terra Environmental Technologies Inc. (TET), a wholly-owned Terra subsidiary, has received certification of its TerraCair Ultrapure® Diesel Exhaust Fluid (DEF) from the American Petroleum Institute, the only national trade organization that certifies the quality of DEF to international performance standards. The certification recognizes that TerraCair Ultrapure® DEF meets the stringent quality standards that engine manufacturer service warranties require. TerraCair Ultrapure® DEF is a nitrogen-based urea solution that is used in conjunction with selective catalytic reduction (SCR) systems to reduce harmful emissions from the exhaust stream of diesel engines. DEF markets are driven by U.S. legislation set to take effect in 2010 that will require new light- and heavy-duty diesel trucks to meet more stringent emissions requirements. In addition to improving air quality, the technology has the potential to increase fuel economy. Terra says this certification marks continued progress in Terra’s efforts to establish TET as a leader in environmental technologies. Terra continues to devote substantial resources to TET, consistent with its strategy of focusing on higher value, upgraded products and differentiated markets. TET supplies TerraCair Ultrapure® DEF to U.S. and Canadian customers from a number of plant locations directly and through licensed distribution channels.