They analyzed ozone measurements taken from weather balloons and satellites, as well as satellite measurements of sulfur dioxide emitted by volcanoes, which can also enhance ozone depletion. (sciencedaily.com)
There is also a considerable gap in the otherwise dense network of global ozone measurement stations here. (sciencedaily.com)
Climate scientists studying three decades of ozone measurements from seven satellites see a positive trend in the upper stratospheric ozone thanks to international efforts to curb ozone - depleting substances. (en.ilmatieteenlaitos.fi)