| Resumo: | This work analyzes, from a social point of view, government policies designed during the 1970-1996 period to attack the problem of air pollution in the Valley of Mexico. The aim is to think of environmental problems as socially construed. From such a perspective, it is not correct to seek only criteria of scientific objectivity, for the ideological and political aspects that intervene to define agendas and establish priorities must also be considered. An environmental problem, such as air pollution, is built in part with elements taken from scientific diagnoses, but also from the rationale of governance. Therefore, in defining a problem it is necessary to consider the disputes, agreements, disagreements, and consensus whereby a problem starts to be recognized as such, until it is considered worthy of government corrective actions.
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