ozone_11sept2014[1]

Atmospheric concentration of an ozone destroying chemical drops mysteriously

From the “possible measurement error” department. Larry O’Hanlon (via AGU blogs) writes: Something strange has happened to the atmospheric concentration of a newly discovered, human-made, ozone-destroying gas: it has suddenly dropped and nobody knows why. The gas, HCFC-133a, is a type of hydrochlorofluorocarbon, ozone-destroying compounds used in some industrial processes, including the manufacturing of refrigerants.…

Arctic ozone without the Montreal Protocol (left) and following its implementation (right) on 26 March 2011. Credit: Sandip Dhomse

Claim: ‘Severe ozone depletion avoided ‘

From the University of Leeds We are already reaping the rewards of the Montreal Protocol, with the ozone layer in much better shape than it would have been without the UN treaty, according to a new study in Nature Communications. Study lead author Professor Martyn Chipperfield, from the School of Earth & Environment at the…