Researchers studied data on the atmospheric levels of the chemical CFC-11
This is a chlorofluorocarbon and was banned from global production in 2010
It is a potent greenhouse gas that can have the same impact as CO2 from a city
There was a spike in emissions from CFC-11 in 2018 that was tracked to China
The Chinese government shutdown the rule-breaking factory and made arrests with the new data confirming CFC-11 emissions are once again declining