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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.

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.

National Retail Systems has deployed 115 trucks to comply with the Clean Truck Program requirements set forth by the ports of Los Angeles and Long Beach, the company said Tuesday.

The Environmental Protection Agency will hold a public hearing March 5 on a 2007 decision to deny California a waiver allowing the state to implement its own greenhouse gas emission standards for automobiles and light trucks.

RENTON, Wash. — In the struggle to squeeze a few more miles out of each tank of fuel, truck makers are designing tractors with the aid of computer models and wind tunnels more generally used to tweak race cars or airplanes.

ARLINGTON, Va. — A top Navistar Inc. official said the company is pursuing its own solution to meet the 2010 U.S. emission standards, because it doesn’t believe the fuel savings claimed by competitors will justify the higher costs and more complicated systems associated with the new engines.