Blue Sky, Blue Water is a timely and comprehensive resource that explores the dynamic intersection of air pollution, climate resilience, and water governance in the 21st century. This scholarly book brings together cutting-edge research, case studies, and innovative strategies aimed at promoting environmental sustainability and public health. Spanning 18 chapters, it offers both conceptual and real-world perspectives across diverse regions and scientific disciplines. Key themes covered in this volume include an in-depth analysis of air pollution’s health effects, microplastic risks, climate extremes, and advanced wastewater treatment techniques such as nanotechnology and blockchain-based governance. This book also highlights the value of traditional knowledge and community-based water conservation, bridging science with practice. Readers will benefit from multidisciplinary insights and practical recommendations for sustainable policy-making and environmental stewardship. This book is an essential resource for researchers, environmental scientists, policymakers, urban planners, and students of environmental studies and public health. Its broad thematic coverage and global relevance make it suitable for academic institutions, government agencies, and non-governmental organizations focused on creating a sustainable and equitable future.