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Trichlorofluoromethane, also known as CFC-11 and Freon 11, is a refrigerant, aerosol propellant, and foam-blowing agent. It is unusual in that its boiling point is at normal ambient temperature and pressure, so it can be handled as a liquid or gas. It is often described as having an “ethereal� (i.e., etherlike) odor.

Once the world’s most widely used refrigerant, CFC-11 came under attack in the 1980s because it was discovered that CFC-11 and other chlorofluorocarbons deplete the ozone layer in Earth’s atmosphere. Countries that subscribed to the Montreal Protocol of 1987 agreed to a moratorium on its production, with full cessation by 2010. The United States stopped making it at the end of 1995.

The atmospheric concentration of CFC-11 gradually decreased from 1995 to 2014, when it began to rise again. Recently, atmospheric monitoring by S. Park at Kyungpook National University (Daegu, South Korea) and collaborators in six countries revealed that despite the country’s efforts to clamp down on manufacturers. According to one team member, “They’re producing [CFC-11] in serious quantities. We hope this [study] provides another piece of information [China] can use to tackle this problem.�