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For any who have ever doubted how harmful emissions could be:

http://news.bbc.co.uk/2/hi/in_pictures/7506925.stm

This is a BBC photo series of Beijing's skyline in August 2008 comparing the "Blue Sky Days" to the heavily polluted days. Days are captioned with particulate level readings.

Shocking and not for the faint of heart.

That's just summer inversion (natural smog) plus summer emissions.

It's much worse in winter when home heating (by bituminous coal) is added. It's incredible.