Weather patterns are often the reason that pollution settles over a city. Smog can be created when pollutants in the air are heated by the sun. When wind is light or non-existent smog will then settle over a city. This is why, in many cities, there is more smog and stagnant air pollution in the summer.
Geography is also a factor in pollution. For example, Mexico City’s high elevation causes incomplete fuel combustion, which increases carbon monoxide emissions. The city sits at the bottom of a volcanic caldera, which prevents pollution from dissipating.
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