This review article discusses the recent advancements in nanostructured materials for gas sensing applications. It highlights the inherent qualities of nanomaterials, such as their ability to chemically or physically adsorb gases and their high surface-to-volume ratio, which make them excellent candidates for gas sensing technology. The article covers various types of nanomaterial-based gas sensors, their manufacturing processes, and sensing mechanisms, with a focus on their selectivity, reproducibility, durability, and cost-effectiveness. The review also evaluates and compares the key characteristics of gas sensing systems made from different dimensional nanomaterials. The introduction section emphasizes the importance of gas sensors in detecting toxic, flammable, and hazardous gases, which are increasingly prevalent due to factors like industrialization and urbanization. It outlines the various applications of gas sensors, including environmental monitoring, medical diagnostics, food safety, and public safety. The article then delves into the mechanisms of gas sensing, including catalytic combustion, thermal conductivity, electrochemical, optical, and electrical conductivity/resistivity mechanisms. Each mechanism is explained in detail, with examples of how different nanomaterials can enhance gas sensing performance. The review also discusses gas sensors based on zero-dimensional (0D), one-dimensional (1D), and three-dimensional (3D) nanomaterials. For 0D nanomaterials, such as carbon dots, the article highlights their unique properties and how they improve gas sensing efficiency. For 1D nanomaterials, the focus is on nanowires and nanorods, which are known for their high sensitivity and selectivity. The article provides examples of how these materials can be functionalized to enhance gas sensing capabilities. Finally, the review explores gas sensors based on metal nanoparticles, such as gold nanoparticles, and their applications in detecting specific gases like CO and NO₂. It discusses the mechanisms by which these nanoparticles improve sensor performance and the factors that influence their effectiveness. Overall, the article provides a comprehensive overview of the latest advancements in nanostructured materials for gas sensing, emphasizing their potential in improving the sensitivity, selectivity, and reliability of gas sensors.This review article discusses the recent advancements in nanostructured materials for gas sensing applications. It highlights the inherent qualities of nanomaterials, such as their ability to chemically or physically adsorb gases and their high surface-to-volume ratio, which make them excellent candidates for gas sensing technology. The article covers various types of nanomaterial-based gas sensors, their manufacturing processes, and sensing mechanisms, with a focus on their selectivity, reproducibility, durability, and cost-effectiveness. The review also evaluates and compares the key characteristics of gas sensing systems made from different dimensional nanomaterials. The introduction section emphasizes the importance of gas sensors in detecting toxic, flammable, and hazardous gases, which are increasingly prevalent due to factors like industrialization and urbanization. It outlines the various applications of gas sensors, including environmental monitoring, medical diagnostics, food safety, and public safety. The article then delves into the mechanisms of gas sensing, including catalytic combustion, thermal conductivity, electrochemical, optical, and electrical conductivity/resistivity mechanisms. Each mechanism is explained in detail, with examples of how different nanomaterials can enhance gas sensing performance. The review also discusses gas sensors based on zero-dimensional (0D), one-dimensional (1D), and three-dimensional (3D) nanomaterials. For 0D nanomaterials, such as carbon dots, the article highlights their unique properties and how they improve gas sensing efficiency. For 1D nanomaterials, the focus is on nanowires and nanorods, which are known for their high sensitivity and selectivity. The article provides examples of how these materials can be functionalized to enhance gas sensing capabilities. Finally, the review explores gas sensors based on metal nanoparticles, such as gold nanoparticles, and their applications in detecting specific gases like CO and NO₂. It discusses the mechanisms by which these nanoparticles improve sensor performance and the factors that influence their effectiveness. Overall, the article provides a comprehensive overview of the latest advancements in nanostructured materials for gas sensing, emphasizing their potential in improving the sensitivity, selectivity, and reliability of gas sensors.