In early 2011, stratospheric temperatures rose over the tropics due to La Nina while temperatures over the poles fell below the long-term average.

Trends in Emissions of Ozone-Depleting Substances, Ozone Layer Recovery, and Implications for Ultraviolet Radiation Exposure

This report integrates current knowledge of the stratospheric ozone layer, human-emitted ozone-depleting substances, and the amount of harmful ultraviolet radiation reaching Earth's surface.

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