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            july 21, 2019

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US to tighten nitrogen oxide emissions from trucks


The US Environmental Protection Agency plans to publish a proposed rule in early 2020 to further lower nitrogen oxide emissions from truck engines that have already been cut by 40 per cent. The announcement comes amid estimates that these vehicles will account for one-third of NOx emissions within the transportation sector in 2025, if no remedial action is taken, according to Shipping Gazette.
However, the specifics of the plan have yet to be worked out. The EPA last revised NOx standards for on-highway heavy-duty trucks and engines in January 2001.
"Through rulemaking and a comprehensive review of existing requirements, we will capitalise on these gains and incentivise new technologies to ensure our heavy-duty trucks are clean and remain a competitive method of transportation," Acting EPA administrator Andrew Wheeler was quoted as saying in a report by American Shipper.
The EPA said its notice of proposed rulemaking in 2020 will initiate new standards for truck engine emissions standards starting with the 2024 model year.
"This time frame is consistent with the lead-time requirements of the Clean Air Act and is aligned with a milestone implementation year for the EPA heavy-duty Phase 2 GHG (greenhouse gas) programme," the agency said.
The EPA said its goal is to develop a nationwide initiative, which would streamline compliance for truck manufacturers. The agency will develop the proposal with input from government and industry stakeholders, including heavy-duty vehicle and engine manufacturers, the California Air Resources Board, environmental nongovernmental organisations, air quality agencies, truck drivers and owners.
The truck manufacturing and operating industries are lining up behind the EPA's Clean Truck Initiative.
"Manufacturers welcome EPA's announcement of a stricter national emissions standard for heavy-duty truck engines," said National Association of Manufacturers vice president Ross Eisenberg. "This new rule will provide manufacturers with additional regulatory certainty and contribute to the cleaner environment we've promised to help deliver."
The Diesel Technology Forum, which also supports the Clean Trucks Initiative, noted that the diesel engine industry already has made significant progress since 2000 to reduce emissions, adding that "it would take more than 60 of today's generation of diesel-powered heavy-duty commercial trucks to equal the emissions of a single US model made in the pre-2000 era."

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