The Montreal Protocol has been signed by 197 countries around the world, including Canada, the U.S., and China. The increase implied that someone was secretly violating the Montreal Protocol. However, Rigby said scientists and watchdogs didn’t know just how much manufacturers in China were emitting — about 7,000 tonnes of CFC-11 since 2013 in that area alone. According to a 2018 United Nations report, due to the progress of the Montreal Protocol, the huge ozone hole that forms above Antarctica could be completely healed by the mid-century. But Rigby said if the increased emissions from eastern China aren’t stopped soon, the healing process could be delayed by “potentially decades.”

Source: National Post May 22, 2019 18:32 UTC