This book presents both foundational and advanced insights into smart nanomaterials and related nanomaterials for environmental remediation. Several chapters explore the fundamentals of smart nanomaterials and their synthesis, enabling readers to understand the different classes of smart nanomaterials and their properties. The volume offers a comprehensive overview of the principles, recent advances, and applications of sustainable nanotechnologies for pollution mitigation, along with the associated challenges. Health and safety aspects are also discussed in the book in detail. This work further explains how bioactive and smart nanomaterials can be translated into real-time, commercially viable applications. Key emerging areas such as nanomaterial-based hydrogels, next-generation smart nanomaterials, and the remediation of microplastics and lanthanides are given special emphasis. By compiling recent developments in the use of smart nanomaterials for the remediation of air, water, and soil pollution, this book distinguishes itself as a timely and comprehensive resource in the field.