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Abstract: The largest urban areas of mexico cities have witnessed high levels of air pollution in the past few decades. The most important air pollutants are ozone and particulate matter with levels that are still far above current air quality standard. In this work we studied exhaust and evaporative emissions of mexico City metropolitan area (MAMC) vehicles using fuels in which sulfur content was varied from 89×10⁻⁶ to 817×10⁻⁶, and calculated the ozone forming potential of emissions as well as the specific reactivity of the exhaust for each average fleet-fuel combinations. Data on emission levels were compared to those obtained in 2000 for the same vintage of vehicles. The almost twofold increase in emissions found could be due to degradation of the exhaust emissions control systems.

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