Renewable diesel is touted as a cleaner-burning fuel, but a recent study has shown the fuel falls short on one measure of reducing pollution from new truck engines - giving pause to California regulators who support increased production.
The pump at an alternative fueling station that provides fuel other than gasoline is shown in San Diego, California January 8, 2015. REUTERS/Mike Blakehas shown the fuel falls short on one measure of reducing pollution from new truck engines - giving pause to California regulators who support increased production.
However, engines made more recently emit more NOx when running on renewable diesel, especially when blended with 35% biodiesel or more, compared with conventional diesel, according to a study released by California Air Resources Board in November. CARB said it has "identified several questions about the study results" that require further evaluation, and will be accepting public comment on the study until the end of January.Heavy-duty vehicles are one of the largest contributors to NOx emissions - a precursor of ozone and particulate matter formation. Improved emissions control technology has helped NOx emissions fall by 60% between 1990 and 2019 nationwide, according to the U.S. Environmental Protection Agency.
“CARB threw caution to the wind and opened the door to renewable diesel's unlimited use without having properly studied NOx emissions impact in NTDEs,” said Pat McDuff, chief executive officer at Glendale-based California Fueling, in a public comment submitted in January.
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