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Diesel fuel is a major grade in the Thai market used in transportation of goods and in most light duty vehicles. Over the last fifteen years the quality of this fuel has continuously increased. This is one of the major factors that have allowed a substantial improvement in air quality. The improvement in diesel fuel quality has been achieved by using a mix of measures, some well known like reduction in sulphur content, whilst others are unique to this market. Since 1993, in Thailand it has been mandatory to use a diesel detergent. This has ensured best driveability and lowest emissions due to the control of injector deposits. This measure was unique in the world and although not mandatory any longer, this market has a large proportion of automotive diesel treated with this type of additive. Another action has been the evaluation of Palm Oil Methyl Ester (PME) and its potential impact in the market. However, experience with PME is limited.