The Global Challenge Network on Tropospheric Ozone was funded by the Science & Technology Facilities Council (STFC) and coordinated by the NERC Centre for Ecology & Hydrology (CEH). 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.