I saw up to AQI 1000 in 2013, and that felt pretty apocalyptic. At the time Shenyang and Beijing were about as bad as each other, and people were really starting to get alarmed at how bad it was. I think that was the year one of the nicest hotels in Shenyang was set on fire by fireworks, and I think the same thing happened to a pretty famous building in Beijing the year before.
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