Abstract
The research programme performed in Ecole des Mines de Douai jointly with Université des Sciences et Techniques de Lille is concerned with the production processes of ozone and photochemical oxidants in the troposphere, using models and field measurements. The work described here, proposed by the Mexican Environment Ministry, concerned with possible influence of a change in the hydrocarbon concentrations of gasoline commercially available in 1986, on the ozone concentrations measured in Mexico city. Analyses of the composition of different petrols have been carried out. Simulations based on a Lagrangian model were used to estimate the variations of ozone concentrations as a function of emissions composition in volatile organic compounds (VOC). The results of analysis and simulations have been compared with measurements provided by the automatic air pollution network of Mexico City. This paper will explain the process used to obtain the model input data, the results of the various analyses and the intercomparison between measured and simulated values.
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