Driving restrictions have been employed in Mexico trying to reduce the air pollution; but results have not been as expected. On November 1989, driving restrictions were applied for the first time in a mandatory fashion, removing 20% of the vehicles of the traffic from Monday to Friday, adding Saturdays in July 2008 and modified in 2014 and 2016. Nevertheless, reduction in the air pollution measured was not observed, neither in 1989, 2008, 2014 or 2016. In 1992 the reduction of sulphur in gasoline content (to 300-500 ppm) reduced the pollution, but in 2009 when the content of sulphur was reduced to 30 ppm the air not show the expected pollution reduction. Similar restrictions have been applied in 11 more cities around the world.
Keywords: Air Pollution, Sulphur, driving restrictions
