UK Environment Agency banned a fracking chemical at Balcombe.

Guardian: “The UK’s fracking pioneer Cuadrilla was prevented by the Environment Agency from using a hazardous chemical at its drilling site in Sussex, local residents have been told. But permission was granted for another chemical despite concerns over its safety.” Banned: antimony trioxide. Allowed: oxirane. Known as an oxygen scavenger, it is used to prevent corrosion.