Marine Notice 2025-1

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May 2, 2025

Marine Notice 2025-1: Advisory to Owners or Operators of Ocean-Going Vessels Visiting California Ports

Confirming Alternative Fuel Use and Compliance with CARB’s Ocean-Going Vessel Fuel Regulation


The California Air Resources Board’s (CARB) Ocean-Going Vessel (OGV) Fuel Regulation (Regulation) reduces emissions of particulate matter (PM), nitrogen oxides (NOx), and sulfur oxides (SOx) from OGVs operating within regulated California waters. The purpose of this Marine Notice is to provide guidance on the definition and use of allowable fuels under the Regulation, including compliant marine gas oil (MGO) and marine diesel oil (MDO), as well as regarding exempt alternative fuels. This Marine Notice also confirms allowable pilot fuels and addresses CARB’s enforcement practices. 

Marine Notice


How Can I Get More Information? 

Information on California’s OGV Fuel Regulation including marine notices, advisories, and alerts, is available online or by contacting the OGV Fuel team at ogvfuelrule@arb.ca.gov 

More Information


Background

In 2008, CARB adopted the regulation, “Fuel Sulfur and Other Operational Requirements for Ocean-Going Vessels within California Waters and 24 Nautical Miles of the California Baseline,” which was later amended in 2011. This regulation requires the use of cleaner marine fuels and reduces emissions of PM, NOx, and SOx from OGVs. These emission reductions are necessary to improve air quality and public health in California.