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A comment on Mystery of London fog that killed 12,000 finally solved.

Re:Mystery of London fog that killed 12,000 finally solved by jpeterman on Tuesday December 13, 2016 @06:24PM (#13172268)
> and measuring the atmosphere in China, which is home to 16 of the 20 most polluted cities in the world.

I wonder what the source is on this.

I only spent a minute Google searching, but the numbers I'm seeing put China WAY below 16 of the top 20.

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