Ask people in Mexico City and they invariably tell you it’s the world’s second largest city with 36 million inhabitants, second only to Shanghai’s 42 million. Of course, I have no way of independently verifying this, but a Google search reveals that the population is much lower and Mexico City isn’t second. In any event, the place is huge.
Such a huge city has its share of traffic problems and pollution can get very bad. But on the June weekend when I visited, it was sweater cool and the skies were very blue. Situated in a bowl surrounded by mountains, I can see how the pollution can vary. But its elevation usually makes the climate mild, despite the erroneous mythology to the contrary. Traffic, alas, is definitely a problem. I suggest you don’t drive in Mexico City.