– Airpocalypse now: China pollution reaching record levels:
In some areas level of harmful particles in the air were 56 times the levels considered safe by the World Health Organisation
Residents of north-eastern China donned gas masks and locked themselves indoors on Sunday after their homes were enveloped by some of the worst levels of smog on record.
Levels of PM2.5, a tiny airborne particulate linked to cancer and heart disease, soared in Liaoning province as northern China began burning coal to heat homes at the start of the winter.
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Russia too it seems.
https://www.theguardian.com/world/2016/sep/07/investigation-ordered-russia-daldykan-river-turns-red-norilsk