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Truck engine makers planning to use selective catalytic reduction in 2010 engines lashed out last week against what one executive called “unsubstantiated attacks leveled against SCR” by the one manufacturer that plans to use only exhaust gas recirculation to cut emissions of smog-forming nitrogen oxides.

President Obama called on Congress to approve legislation creating a cap-and-trade system aimed at reducing carbon emissions. Obama spoke on Feb. 24 to Congress in a joint session and invited spectators, who included the chairman of American Trucking Associations.

WASHINGTON — Transportation Secretary Ray LaHood said federal officials should explore all options to finance infrastructure, but he later strongly rejected a fuel tax increase, at least while the economy is in recession.

President Obama urged Congress Tuesday night to pass legislation to implement a cap-and-trade program to regulate carbon pollution in the United States, Agence France-Presse reported.

The Massachusetts Turnpike Authority approved toll increases Tuesday, but promised that motorists will avoid the increases if the state legislature increases the fuel tax, the Boston Globe reported.

The Environmental Protection Agency has rejected Navistar Inc.’s request to allow manufacturers sell engines compliant with either the agency’s 2007 or 2010 emission standards until 2012.

The Environmental Protection Agency has rejected Navistar Inc.’s request to allow manufacturers sell engines compliant with either the agency’s 2007 or 2010 emission standards until 2012.

California environmental regulators are drawing up plans to issue vouchers as early as this spring to small fleets to help them pay for replacing old trucks with units carrying a 2007 or newer diesel engine.

The average retail price of U.S. diesel declined for the fifth consecutive week, dipping another 3.3 cents a gallon, according to the Department of Energy.