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California cars operating on higher-sulfur gasolines than prevalent in California should not result in “false tripping” of the on-board catalyst monitoring system. The monitoring systems to be used on California low-emission vehicles will be unable to detect the small extra amount of loss in catalyst effectiveness that might be caused by higher sulfur levels outside of California. Testing of a mocked-up ultra low-emission vehicle (ULEV) conducted by the California Air Resources Board (CARB) confirms that on-board monitoring systems are not tripped even by high sulfur levels (800 ppm). An independent U.S. Environmental Protection Agency (EPA) assessment also agrees that “false tripping” of monitoring systems of the California cars is not expected to be a problem either for California cars operated temporarily outside of California or for California-type cars sold in other states.