It has been said that "Mexico City
’s air has gone from among the world’s cleanest to among the dirtiest in the span of a generation."
Historic air pollution episodes of the 1950s led to acute increases in infant mortality
Connections have also been found between air pollution and school absenteeism
among children in Mexico City,
between air pollution and heart rate variability
among the elderly in Mexico City,
and between urban air pollutants on emergency visits for childhood asthma
in Mexico City.