This book discusses air pollution in Delhi from scientific, social and entrepreneurial perspectives. Using key debates and interventions on air pollution, it examines the trajectories of environmental politics in the Delhi region, one of the most polluted areas in the world. It highlights the administrative struggles, public advocacy, and entrepreneurial innovations that have built creative new links between science and urban citizenship. The book describes the atmosphere of collaboration that pervades these otherwise disparate spheres in contemporary Delhi. Key features: · Presents an original case study on urban environmentalism from the Global South · Cuts across science, policy, advocacy and innovation · Includes behind-the-scenes discussions, tensions and experimentations in the Indian air pollution space · Uses immersive ethnography to study a topical and relevant urban issue As South Asian and Global South cities confront fast-intensifying environmental risks, this study presents a dialogue between urban political ecology (UPE) and science and technology studies on Delhi’s air. The book explores how the governance of air is challenged by scales, jurisdictions, and institutional structures. It also shows how technical experts are bridging disciplinary silos as they engage in advocacy by translating science for public understanding. The book serves as a reminder of the enduring struggles over space, quality of life, and citizenship while pointing to the possibilities for different urban futures being negotiated by variegated agents. The book will interest scholars and researchers of science and technology studies, urban studies, urban geography, environmental studies, environmental politics, governance, public administration, and sociology, especially in the Global South context. It will also be useful to practitioners, policymakers, bureaucrats, government bodies, civil society organisations, and those working on air pollution advocacy.