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Several companies that blend diesel exhaust fluid, the urea solution used in truck engines with selective catalytic reduction systems, have had their blends certified by the American Petroleum Institute.

The Environmental Protection Agency may seek to limit greenhouse gas emissions, the Washington Post reported Tuesday.

LOUISVILLE, Ky. — Cummins Inc. said it is confident the Environmental Protection Agency will approve the company’s use of copper zeolite in engines de-signed to meet 2010 emission rules, removing any potential roadblock for the new models.

Transportation officials in Colorado said initial feedback from commercial drivers who have used the AutoSock, a heavy-duty cloth covering for tires, has been positive, and it could become an accepted alternative to metal snow chains.

LOUISVILLE, Ky. — Truck and engine makers took advantage of one of the last major marketing forums before the onset of new federal emission rules to starkly set the stage for buyers of heavy-duty vehicles in choosing between SCR and EGR for their diesel engines.

Forget about getting truck drivers to remove snow and ice from trailer rooftops. For one, many drivers cannot even walk across the parking lot, let alone be expected to somehow get on top of a trailer roof.

The U.S. Environmental Protection Agency last week took the first step toward creating a national cap-and-trade system, proposing a new rule that would establish a federal system for reporting carbon dioxide emissions and other greenhouse gases produced by large stationary and mobile sources.

In its continued attack on greenhouse gas emissions, the California Air Resources Board recently proposed a rule cutting the “carbon intensity” of transportation fuels.

The California Air Resources Board urged federal regulators to reverse a Bush administration decision that blocks the state’s efforts to set its own limits on greenhouse gas emissions from automobiles, the Associated Press reported.