A large multinational team of researchers has documented very high levels of molecular chlorine – as high as 400 parts per trillion – in the atmosphere above Barrow, Alaska. Barrow, Alaska. Image credit: Bob Johnston / CC BY 2.0. Their study, reported in the journal Nature Geoscience, is the first time that molecular chlorine has been measured in the Arctic, and the first time that scientists have documented such high levels of molecular...
