Air pollution and climate change are two major environmental problems. These issues are not only inextricably linked with regard to their effects and mitigation options but also through their causes that include human behavior, infrastructures, technology, and other factors. This implies that societal transformation to a sustainable human-atmosphere relationship will require the involvement of the many facets of society for discussions of normative and value-related issues for the codesign of salient and legitimate solutions. We describe the ClimPol project and a specific subproject Mobility and Climate, which create integrated and long-lasting strategies by applying a transdisciplinary approach together with the framework of coupled-human-atmosphere-systems-thinking.