Pollution in Mexico City Mexico city, as well as other big cities in the world such as Shangai, Paris or L.A. has important issues with air pollution. During the past weeks, the city experienced high rates of pollution in the air, detected by the corresponding commission of the government, in consequence, the authorities decided to implement a contingency program, such program consisted in ban a proportion of the cars from the traffic in order to reduce the pollution. These last events produced that the authorities have had retaken this problem and prioritize it. One the measures that the government implemented was to ban at least one day per week a proportion of cars from the traffic, i.e. depending on their plates, some cars cannot go out from their garages, so ones will not go out on Mondays, others on Tuesdays, and so on. Unfortunately, there is a lot of people that are opposed to this measure, arguing that this is not the core of the problem, but trucks and airplanes.