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The Californian Air Resources Board (CARB) instigated, in three phases, the development of a reformulated gasoline specification, including a sulphur limit of 20 ppm but provides flexible methods of compliance with the specified properties using "flat" or "averaging" limits. Up to 10% ethanol may be blended in gasoline.
CARB Diesel mandates aromatic hydrocarbon limits additional to the US Federal specification but also with flexible means of compliance; a 15 ppm sulphur limit has been applicable since 2006.
A Low Carbon Fuel Standard also applies to all fuels, with the aim to reduce the carbon intensity of transport fuels by 20% by 2030, compared with the 2010 emissions levels.
Gasoline
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Ethanol for blending
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Diesel
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Other fuels
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Introduction
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Methanol
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Ethanol
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CNG
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LPG
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Hydrogen
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Reference Fuels
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Overview
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Gasoline reference fuels
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Diesel reference fuels
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Low Carbon Fuel Standard
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Overview
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Carbon Intensity requirements
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References
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