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California regulators are considering relaxing strict rules for smaller trucking fleets to clean up older diesel-powered trucks that are among the state’s worst remaining sources of air pollution, the Los Angeles Times reported.

A group of more than 20 environmental, health and trucking industry stakeholders have asked House committees to continue funding a popular diesel emissions reduction grant program omitted from the Obama administration’s 2015 fiscal year budget.

Emissions of nitrogen dioxide and particulate matter from heavy-duty engines produced since 2010 are “substantially lower than required by regulations,” according to a new study.

Federal regulators withdrew some portions of a rule they tried to finalize in June that would have made minor technical amendments to the upcoming greenhouse-gas emissions and fuel-efficiency standards for heavy trucks.

WASHINGTON — Work will begin immediately to develop a second round of fuel-performance standards for heavy trucks starting in model year 2019, an Environmental Protection Agency official said Wednesday.

ESW CleanTech has acquired the assets and product line of Cleaire Advanced Emissions Controls.

Sales of all diesel retrofit devices in the United States declined in 2012 for the fourth consecutive year, according to the Manufacturers of Emission Controls Association.

A proposed U.S. rule requiring automakers to double average fuel economy of vehicles to 54.5 miles per gallon by 2025 could cost $157 billion, though the costs would be offset by fuel savings, two federal agencies said in a draft, Bloomberg reported.