For days, locals had to stay indoors or don air masks in an effort to avoid the harmful particles in the air.
The impact of air pollution in London makes for an interactive, educational experience at Somerset House.
In the fall of 2016, Daan Roosegaarde and his team will tour five Chinese cities to spread the word on making them smog-free.
Beware of smoggy skies in "Hollywoop."
The world’s first Smog Free Tower debuts in Rotterdam next month. For Daan Roosegaarde, the rest of the world is next.
Plus: for the cost of a few cubic feet of clean air, you can get a piece of jewelry made from smog.
It's literally the opposite of the sun baby from the Teletubbies.
According to international media, Paris is now "more polluted than Shanghai and London."
"These are entire villages where every other house contains someone dying of cancer or some sort of respiratory problem," says photojournalist Souvid Datta.
This isn't your average Mason jar.
With every swinging baton, the Chinese public trust their government less and less.
Would you wear a ring that used to be pollution?