Recent Trend in Ozone Levels in the Metropolitan zone of Mexico City
Keywords:Ozone, replacement of old cars by news ones, daily emission
Ozone concentration in the atmosphere of Mexico City is analyzed for the period 2000-2006, finding an average reduction of 24%, in spite of not meeting the norm of 110 ppb in more than 42% of the days in Pedregal. The maximum ozone levels in the last three years were 250 ppb well above the norm of 110 ppb. The number of
vehicles registered in the Federal District has increased in the period by an average of 35%. Notwithstanding the increase in vehicular fleet, improvement of air quality is ascribed to the replacement of old cars by more efficient and less contaminating new cars. To decrease even more the ozone concentration, it is suggested to decrease further
the Reid Vapor Pressure of gasoline to 7.0 psia to reduce the evaporation of light olefins.
2. Garfias, F. J.; Huesca, R. La gasolina del Valle de México, p. 1 in «Contaminación Atmosférica III» by García Colín Leopoldo y Varela Ham Juan Rubén, El Colegio Nacional, México. 2001.
3. Personal survey conducted by Javier Audry Sánchez. 2007.
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