With the successful implementation of the Montreal Protocol on Substances that Deplete the Ozone Layer, the atmospheric abundance of ozone-depleting substances continues to decrease slowly and the Antarctic ozone hole is showing signs of recovery. However, growing emissions of unregulated short-lived anthropogenic chlorocarbons are offsetting some of these gains. Here, we report an increase in emissions from China of the industrially produced chlorocarbon, dichloromethane (CH₂Cl₂). The emissions grew from 231 (213-245) Gg yr^-1 in 2011 to 628 (599-658) Gg yr^-1 in 2019, with an average annual increase of 13 (12-15) %, primarily from eastern China. The overall increase in CH₂Cl₂ emissions from China has the same magnitude as the global emission rise of 354 (281-427) Gg yr^-1 over the same period. If global CH₂Cl₂ emissions remain at 2019 levels, they could lead to a delay in Antarctic ozone recovery of around 5 years compared to a scenario with no CH₂Cl₂ emissions.