Some suggested remedies for pollution of the air by automotive emissions have been changes in volatility and composition of the gasoline and the removal of lead antiknocks. Several programs have been run under the sponsorship of the American Petroleum Institute to investigate not only whether these changes would benefit cleaner air through lower emissions, but also the effects on performance of cars. This paper combines and summarizes these programs. Variations in volatility and its effect on emissions and starting and warm-up of the car are discussed. Different olefin concentrations are evaluated for their influence on total emissions and the reactivity of these emissions. The effects on emissions of removing lead antiknocks from gasoline, while maintaining performance qualities as defined by octane and volatility parameters, are analyzed.
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