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A new study from the National Oceanic and Atmospheric Administration (NOAA) shows an "unexpected and persistent increase" in global emissions of an ozone-depleting chemical even though an international treaty forced production to completely halt by 2010.
NOAA scientists suggest that emissions are most likely from new, unreported production from an unidentified source in eastern Asia.
The Earth's protective ozone layer is not recovering uniformly from the damage caused to it by industry and other human activities. And scientists are not sure why it isn't.
An international research team says the ozone, which protects humans and other species from harmful ultraviolet radiation, is continuing to recover at the poles. But recovery at lower latitudes, where far more people live, is not.