In September the World Meteorological Organization (WMO) announced that the ozone layer is recovering. Prof Pieternel Levelt, a remote-sensing expert in the CEG faculty and the Royal Dutch Meteorological Institute (KNMI) contributed to this conclusion. Levelt is the head of OMI, the Ozone Monitoring Instrument, which is on board the NASA space agency’s EOS-Aura satellite. It has been measuring the composition of the atmosphere for 10 years. The measurements have revealed a causal relationship between the decrease in CFCs in the atmosphere and the recovery of the ozone layer. Although the OMI was designed to last for five years, it is still flying after a decade. There is enough fuel to make measurements until 2023, but a successor is already being developed and is scheduled to be launched in 2016.