| Resumo: | The purpose of this article is to analyse atmospheric pollution levels in the Metropolitan Area of Mexico City, its sources, its effect on public health, and the policies issued to reduce the problem. The central thesis states that policies issued up to now are far from reducing atmospheric pollution in the Valley of Mexico, and, even worse, it clearly foresees that this environmental problem will acquire a megalopolitan dimension, which implies chain damage to the valleys of neighbouring cities: Toluca, Cuernavaca, Puebla, Tlaxcala, and Queretaro. This situation seiously threatens the self-regenerative potential of the city ecosystems by breaking the basic harmony between population and nature. Avoiding it through specific urban-regional policy actions is pressing.
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