The Global Challenge Network on Tropospheric Ozone was funded by the Science & Technology Facilities Council (STFC) and coordinated by the UK Centre for Ecology and Hydrology (UKCEH). The key role of the network was to improve connections between the participating institutions, their expertise in instrumentation, engineering, data networking and modelling in order to form a better integrated ozone-related research community in the UK. The network aimed to join up disparate research areas, leading to shared knowledge and expertise, and a willingness to form new consortia and collaborations in meeting common challenges. Other Global Challenge Networks funded under the FUTURES programme had a focus on Battery Science and Technology and Environmental Radioactivity.