Photo: Teflon frying pan
Concentrations of HFC-23, one of the most TIGAIOCO2 on a pound-for-pound basis), remained elevated in East Asia after China, a known past polluter, agreed to curb emissions. To comply with the Montreal Protocol, HCFC-22 manufacturers must install mitigation technologies, at relatively low cost, to destroy the by-product HFC-23. However, air samples collected contained elevated concentrations of it, with some measurements roughly twice that of global background levels measured at other remote locations. The primary source of HFC-23 emissions in China was as a byproduct in the manufacturing of HCFC-22, used to produce other fluorinated chemicals including polytetrafluoroethylene (PTFE), or Teflon.
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