London 'pollution pods' let you sample the smog in Beijing and Delhi

New installation at Somerset House in London lets visitors experience the air of some pollution hotspots - plus a pristine Norwegian island

New Delhi: the suffocating smell of old cars and industry. Sio Paulo: enough ethanol to make your eyes water. And in London, a scent called Living Diesel.

Those are the dominant notes of those cities' contaminated air, according to an "artist's approximation" that aims to raise awareness of the problem of pollution around the world.