11
Air pollution in Europe and North America may be 27 times more toxic than the smog over Chinese cities.
11
64 years ago, a thick blanket of smog covered the city of London and killed more than 12,000 people.
37
A British businessman has come up with a novel new way to make money by selling bottles of fresh air.
18
A recently discovered gas appears to be 7,000 times more impactful on climate change than CO2.
16
A novel new technique for dealing with smog is to be trialled in one of China's largest cities.