…According to the US Environmental Protection Agency, diesel trucks with disabled emissions controls are far more widespread than you might think and emit more pollution than the diesel engines that got Volkswagen such hefty fines.
According to the EPA’s Air Enforcement Division, the use of aftermarket emissions defeat devices by diesel truck owners rivals that problem. In a report first obtained by The New York Times, it estimates that 550,000 medium trucks have had their emissions systems tampered with over the last decade—fully 15 percent of the diesel trucks on US roads…
…Specifically, the EPA says it’s only counting tampering where all of a truck’s emissions controls are removed, as opposed to mods that leave “emissions controls hardware intact and operational.”
…The EPA report says that 570,000 tons of excess NOx and 5,000 tons of excess diesel particulates are the result over the course of these trucks’ lifetimes. Or to put it another way, “due to their severe excess NOx emissions, these trucks have an air quality impact equivalent to adding more than 9 million additional (compliant, non-tampered) diesel pickup trucks to our roads.”
Pleased to see EPA differentiates between gonzo drivers looking to turn their diesel pickups into power hogs regardless of how they get there…vs. the case I imagine is at least as frequent of folks simply trying catch a bit more reliability, easier starting, better fuel economy than the sometimes mediocre design and craftmanship allocated for in truck manufacturers’ budgets.