beijing smog
It's been a rough couple of years for America.
This is one man's mission to document the city's smog.
But the country isn't in the clear yet.
Record-breakingly bad air is likely to worsen as China enters pollution "high season," one expert warns.
WHAT'S HAPPENING
China's capital is on "red alert" over record smog levels, yet it's trying to water down a climate deal in Paris.
You have to see it to believe it.