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WASHINGTON —Attorneys for Daimler Trucks North America and Volvo group today asked a federal appeals court to throw out an Environmental Protection Agency rule that allowed Navistar Inc. to pay “nonconformance penalties” for engines that failed to meet 2010 federal emissions standards for nitrogen oxide compounds.

The Environmental Protection Agency honored 55 freight transportation companies Oct. 22 for their achievements in reducing carbon pollution and other harmful emissions.

Lisa Jackson will step down soon as administrator of the Environmental Protection Agency after four years that included the development of the first greenhouse-gas standards for heavy-duty trucks.

Ineffective oversight of the federal diesel emissions reduction grant program by the Environmental Protection Agency may have caused EPA to overstate the environmental benefits of the program, according to a new audit by the agency’s inspector general.

Carol Browner, the Obama administration’s top adviser on energy and climate issues, plans to step down from her position, the Associated Press reported, citing White House officials.

Automakers and engine manufacturers are suing the Environmental Protection Agency over its plan to allow fuel stations to sell gasoline with 15% ethanol, the Associated Press reported.

Environmental groups said they back the Obama administration’s push to set standards for heavy- and medium-duty truck fuel efficiency, and last week, they called for making the standards even tougher.

WASHINGTON — The Environmental Protection Agency is revisiting its guidance for selective catalytic reduction technology in heavy-duty trucks as a result of a court settlement with Navistar Inc. earlier this year, an agency official said last week.

Longhaul heavy tractor-trailers could achieve a fuel economy of more than 10 miles per gallon by 2030 — from today’s approximately 5 mpg to 6.5 mpg range — according to an analysis prepared for Congress by the U.S. Environmental Protection Agency.