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A program was undertaken to study the effects of fuel volatility characteristics on evaporative emissions from motor vehicles without evaporative loss-control devices. The ultimate objective of this study was to derive a simple mathematical expression relating evaporative emissions from an urban car population to gasoline volatility parameters. Since development of the necessary data base for such a program through direct experimentation would have been quite inefficient, an alternate approach was taken in deriving a set of mathematical models to calculate evaporative emissions from carburetors and fuel tanks of motor vehicles. These models were verified by comparison with limited experimental data.