More EuroVenus results being presented at the European Planetary Sciences Congress 2015: Ann Carine Vandaele explains how Venus Express has been used to measure carbon monoxide in the upper atmosphere of Venus. Her team, in Brussels, built a spectrometer which studies sunsets and sunrises on Venus, as viewed from the spacecraft. As light from the sun passes through the atmosphere of Venus on its way to the spacecraft, some of it is absorbed by gases in the atmosphere, so this is used to measure vertical profiles of how abundant those gases are. Several hundred such measurements were obtained during the course of the Venus Express mission, allowing detailed study of how these gases vary in time and space.