Only in China.
Wouldn't be surprised if they "naturally" grew like this, in the same way that it "naturally" rains here. Aka China shoots up rockets into the sky to literally make it rain to reduce the smog. These rockets release chemicals (silver iodide, dry ice, or liquid propane) to make the clouds condense and thus precipitate. So if someone important is coming into town (or when they had the Olympics), they'll make it rain so we can have a beautiful blue sky for a couple days until the smog creeps back in.
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