That’s maybe part of it, but it also has much to do with the fact that cities themselves are just very dense, urban areas with much vegetation cleared for purposes of buildings, roads and whatnot. Obviously the fact that you can gave fairly lush parks in these cities suggest that more vegetation is certainly possible.
Keep in mind that smog can be damaging to plants in many different ways. Smog creates acid rain, which eats away at many plants. Smog can also delay photosynthesis in plants, stunting their growth process and making them more prone to disease.
So, the reason many plants aren’t in cities isn’t because of the smog, but smog certainly does not help the plants already there.
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