CARB Stars Deciphered

One Star: The engine awarded one star (low emission) meets the California Air Resources Board (CARB) 2001 exhaust-emission standards. A one-star engine has 75 percent lower emissions than a conventional two-stroke engine and meets the U.S. EPA's 2006 standards for marine engines.

Two Stars: The engine awarded two stars (very low emission) meets the CARB 2004 exhaust-emission standards and has 20 percent lower emissions than a one-star engine.

Three Stars: The engine awarded three stars (ultra-low emission) meets the CARB 2008 exhaust-emission standards and has 65 percent lower emissions than a one-star engine. E.S.