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. Carbon tetrachloride ( CCl4 ) is a first-generationozone-depleting substance, and its emissive use and production were globallybanned by the Montreal Protocol with a 2010 phase-out; however, productionand consumption for non-dispersive use as a chemical feedstock and as aprocess agent are still allowed. This study uses the high frequency andmagnitude of CCl4 pollution events from an 8-year real-time atmosphericmeasurement record obtained at Gosan station (a regional backgroundmonitoring site in East Asia) to present evidence of significant unreportedemissions of CCl4 . Top-down emissions of CCl4 amounting to 23.6±7.1  Gg yr −1 from 2011 to 2015 are estimated for China, incontrast to the most recently reported, post-2010, Chinese bottom-upemissions of 4.3–5.2 Gg yr −1 . The missing emissions( ∼19  Gg yr −1 ) for China contribute to approximately 54 % of global CCl4 emissions. It is also shown that 89  %±6  % of CCl4 enhancements observed at Gosan are related to CCl4 emissions from theproduction of CH3Cl , CH2Cl2 , CHCl3 and C2Cl4 and its usage as a feedstock and process agent in chemicalmanufacturing industries. Specific sources and processes are identifiedusing statistical methods, and it is considered highly unlikely that CCl4 is emitted by dispersive uses such as old landfills, contaminatedsoils and solvent usage. It is thus crucial to implement technicalimprovements and better regulation strategies to reduce evaporative lossesof CCl4 occurring at the factory and/or process levels.

atmospheric chemistry and physics

Toward resolving the budget discrepancy of ozone-depleting carbon tetrachloride (CCl&amp;lt;sub&amp;gt;4&amp;lt;/sub&amp;gt;): an analysis of top-down emissions from China