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Cummins Inc. and Caterpillar Inc. have been marketing new lower-emissions diesel engines to the motorhome industry for several months now, but the U.S. Environmental Protection Agency (EPA) is about to make the standards even tougher, according to various wire services.
The Bush administration is expected to finalize on Tuesday (May 10) tougher diesel emissions standards that will go into effect in 2008.
The new rules will apply to diesel engines used to power portable generators and various off-road vehicles, including bulldozers, tractors, forklifts and aircraft service equipment.
The EPA will require a sharp reduction in the amount of nitrous oxide emitted by diesel engines, and, in a separate action, the EPA will require refiners to drastically reduce the amount of sulphur in diesel fuel. The new rule will require refiners to reduce to 15 parts per million (ppm), from the current 500 ppm, the amount of sulphur in diesel fuel, according to the Associated Press (AP).