Why is pollution a problem in Mexico City?
Overpopulation, irresponsible consumer habits and geography
create a "perfect storm" in Mexico City that allows air pollution
to be the problem it is there.
The city sits in a valley surrounded by mountains. Smog from
manufacturing and chemical plants as well as vehicle exhaust fumes
get trapped by the surrounding mountains due to lack of any
powerful-enough winds. This makes up the layer of gloom that sits
over the valley due to a "cook-pot effect".
This smog can cause burning in the eyes and throat of visitors
not used to it within a few days, especially in those with
sensitivities to pollutants.