Índice Metropolitano de la Calidad del Aire

The ''Índice Metropolitano de la Calidad del Aire'' or IMECA, in English meaning the Metropolitan Index of Air Quality, is the reference value system for the levels of air pollution in the Mexico City Metropolitan Area, within the Valley of Mexico.

It is a real-time monitoring of the concentrations of several pollutants in the atmosphere of the Mexico City Metropolitan Area. It was established for the inhabitants of Mexico City and the Greater Mexico City area to know the real-time levels of air pollution in their urban environment. Provided by Wikipedia