According to Diesel Technology Forum analysis using IHS Markit data (and as presented byDieselnet.com), 36 percent of Class 3-8 diesel-equipped trucks in America are now powered by engines that meet ’11 or newer emissions standards. This means engines that utilize EGR, SCR and DPF technology to curb NOx and particulate matter pollution. Among Class 8 trucks, Indiana, Tennessee and the District of Columbia have the highest percentage of clean diesel technology (66%, 60% and 48%, respectively), while the lowest percentages can be found in North Dakota (16%), South Dakota (17%), Alaska (20%), Idaho (21%) and Kentucky (23%).