For days, locals had to stay indoors or don air masks in an effort to avoid the harmful particles in the air.
Kolkata's air was six times more toxic than what's allowed by the Indian government.
In this polluted world, a girl is on a mission to find a way to avoid all the toxins in our air.
The Smog Free Project was inspired by air pollution problems in Beijing.
The impact of air pollution in London makes for an interactive, educational experience at Somerset House.
Donald Trump has called the EPA a 'disgrace.' There was a time when it didn't exist.
It’s like having a really shitty snow day that slowly kills you.
Can China turn its pollution problem into diamonds?
In the fall of 2016, Daan Roosegaarde and his team will tour five Chinese cities to spread the word on making them smog-free.
The World Health Organization says air pollution is up 8 percent around the world and, while rich countries are becoming cleaner for the most part, 98 percent of cities in poor nations failed to reach minimum thresholds for healthy air.
The worst bout of air pollution in over a decade has raised fears that the Mexican capital could be heading back to the days when constantly watering eyes and irritated throats were the norm.