bilby
Fair dinkum thinkum
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That cannot be correct, as there are larger and more densely populated cities than Mexico City that do not have this problem. Clearly population size and population density are not in themselves sufficient cause to create this issue; and equally clearly there exist solutions that do not include or require population or population density reductions.
Of course, Mexico City may not be practically or financially able to implement those solutions; but then, nor can she implement population reductions in a practical or affordable way.
Actually, there are not any cities that are both more densely populated AND larger than Mexico city. It it the 27th most densely populated in the world, and is larger than all other 26 cities that are more densely populated than it. In fact, it is 4 times larger than most of those other cities, and about twice as large as the rest, with the more densely populated city that close in size begin San Paolo which is among the most polluted cities in the world, whose air kills more people per year than car accidents.
In fact, most of the cities with more population density than Mexico City, also have worse air pollution.
In addition, Mexico City gets more tourism than most cities with higher populations than it. A compounding factor is geography. Mexico city is at the bottom of the natural bowl that holds in the pollution.
None of which supports your claim that population reduction is the only solution.
For example, replacing all gasoline, diesel and gas powered vehicles in Mexico City with electric vehicles, and generating the power by zero emission technologies (nuclear, solar, wind) and/or in remote locations where the pollution is less of a concern, would be a viable solution - and is not obviously less easy to achieve than population reductions.