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Indeed, there is an abundance of butterflies, bees, and other such creatures amidst the urban area —a surprising sight for a densely populated city. However, it's not to the extent that it becomes bothersome.

I assume there will be more insects but also more insect predators. I mean, life always finds its way, and usually a balance as well.

I just checked and the pm2 levels are as bad as they were when I visited pre Covid (50 μg/m^3). I was there for 3 months, in El Poblado neighborhood and the air quality was horrendous, I would never go back. The depression in which the city lays also keeps all the pollution in place for longer.