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What are 3 factors that have led the smog problem of Mexico city?

In: Mexico [Edit categories]

Answer:

21 million people living in the same urban conglomerate.
Geographic factors, including the fact that the city is located within a valley, which prevents any winds to clear up the smoke.
Up to 3 million vehicles rolling around the city, many of them with substandard maintenance and high emissions.

First answer by Everac99. Last edit by Everac99. Contributor trust: 262 [recommend contributor ]. Question popularity: 2 [recommend question].

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