The California Air Resources Board (CARB) has revised the state’s low-sulfur fuel standards for ocean-going vessels, updating a 2008 regulation that applies to all domestic and foreign-flagged cargo ships, tankers and cruise ships sailing within 24 miles of the state’s coastline. Under the revisions, which CARB adopted on June 23, 2011, the vessels have two additional years, until January 1, 2014, to comply with the second phase of the regulations.

The regulations require the use of marine gas oil or marine diesel oil that contains no more than 0.1 percent sulfur to power main propulsion engines, auxiliary engines and auxiliary boilers. The revisions more closely align the standards with North American Emission Control Area requirements approved by the International Maritime Organization in March 2010.