"From the Korean and Japanese data, we used our models to show that emissions of CFC-11 from north eastern China had increased by around 7,000 tons per year after 2013, particularly in or around the provinces of Shandong and Hebei," said Luke Western, a University of Bristol atmospheric modeler. "We didn't find evidence of increasing emissions from Japan, the Korean peninsula or any other country to which our networks are sensitive."
Matt Rigby, a lead author of the study, said the team looked at whether the spike in emissions could be from products created before the phaseout in 2010, but they concluded that "the most likely explanation is that new production has taken place, at least prior to the end of 2017, which is the period covered in our work."