The picture at top was taken at 11:30am Shanghai time today, in "broad daylight."
The picture on bottom was taken 7.5 hours later, when they turned the night lights on.

Every week we are reminded of China's game of catch-up with America. Well, there's one area in which China has already produced results that we could never dream of: pollution. And that has been on display in Shanghai for the past 48 hours, as a blinding, choking smog descended on the city. It's the kind of pollution we could never hope to match.

Don't get me wrong, America was a great polluter, once. But then a Native American cried on TV and we stopped all that (we also shifted our heavy-polluting industries guessed it...China). Still, even at our worst, we have nothing on the Chinese for sheer polluting power: 

Sources: redditor mepper | redditor non-conformity | redditor CMPLEKSiTYHD | Air Quality Index | redditor sandgaraa | redditor eggy_weggs