"For much of the past month the cloud of toxic air hanging over this country has extended for thousands of miles, a giant, continent-sized cocktail of soot from coal fired power stations and car exhausts, smothering the lives and filling the lungs of hundreds of millions of people."
But that's not the half of it; it turns out that only the most draconian precautions can protect Beijing residents from the pollution while they're indoors -- precautions that are financially out of reach for most Chinese.
The photos accompanying the BBC report include this one:
Beijing: The city where you can't escape smog
By John Sudworth
15 January 2017