First measurements of iodine in the Arctic

[Still Waters]

New measurements of molecular iodine in the Arctic show that even a tiny amount of the element can deplete ozone in the lower atmosphere.

This is surprising because iodine is so scarce in the Arctic snowpack compared to its close relatives and known ozone-killers, chlorine and bromine. Less than one part per trillion of iodine is enough to have a significant effect on ozone concentration in the lower atmosphere, according to a study published Sept. 5 in Proceedings of the National Academy of Sciences.

https://phys.org/news/2017-09-iodine-arctic-reveal-air-pollution.html#ms