The uptick in the airborne chemical HCFC-141b comes even though reported production has declined steadily since 2012, leaving scientists stumped about the source.
that levels of the banned chemical CFC-11 had been rising since 2012. An international panel concluded that surge was likely due to illicit production, much of it in eastern China, perhaps because HCFC-141b, then used as a substitute for CFC-11 because it is less destructive to ozone, was in scarce supply. Releases of CFC-11 started to fall once again in 2019.
One possibility is that unreported HCFC-141b is being manufactured somewhere in the world, Montzka says. But the blip could also be temporary, triggered as aging appliances are thrown out and the foam breaks down, releasing the gas. “Taking a close look, we realized there are possible explanations that don’t require somebody doing something that they weren’t supposed to do,” Montzka says.
France Dernières Nouvelles, France Actualités
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