DALLAS --- The city of Dallas has started running much of its fleet on biodiesel fuel that contains a new additive to reduce NOx (oxides of nitrogen) emissions, one of the primary causes of the ozone pollution problem in North Texas. The additive, ORYXE LED for Biodiesel, recently received approval from the Texas Commission on Environmental Quality (TCEQ). This additive is blended with B20 biodiesel, which is a mix of 20 percent biodiesel and 80 percent petroleum diesel. Dallas is fueling several hundred vehicles with the new biodiesel blend, including sanitation trucks, utility trucks and construction equipment. The city plans to use approximately 350,000 gallons of the biodiesel per year. When compared to petroleum diesel, Environmental Protection Agency (EPA) data shows that biodiesel reduces most harmful emissions but increases NOx. TCEQ-supervised testing shows the ORYXE Energy technology cuts NOx to a level that's acceptable for biodiesel to meet state air-quality standards. "The city of Dallas is constantly striving to be at the forefront of clean technology, and we hope our example will lead to other large diesel fleets using this cleaner fuel blend," said Ramiro Lopez, who oversees fuel and environmental services for the Department of Equipment and Building Services. "With NOx being such a big issue in the Metroplex, we waited for this technology to become available so we could reintroduce biodiesel into our fleet." Tests on ORYXE LED for Biodiesel, which followed strict federal test procedures mandated by the TCEQ, were conducted at West Virginia University Engine and Emissions Research Laboratory. The B20 fuel treated with the ORYXE additive showed equivalent NOx levels to Texas Low Emission Diesel (TxLED) fuel (5.7 percent lower than standard EPA petroleum diesel). In addition to reducing NOx, the biodiesel blend with ORYXE Energy technology also reduced particulate matter (PM) by 28.8 percent, total hydrocarbons (THC) by 17.5 percent and carbon monoxide (CO) by 19 percent beyond the required TxLED levels.