This review summarizes recent advances in nanostructured materials for gas sensing applications. Gas sensors are crucial in various industries, including pharmaceutical, medical engineering, clinical diagnostics, public safety, and food monitoring. Nanomaterials, due to their high surface-to-volume ratio and ability to adsorb gases, are excellent candidates for gas sensing. These sensors offer selectivity, reproducibility, durability, and cost-effectiveness. The review discusses various nanomaterials, their manufacturing processes, sensing mechanisms, and recent advancements. It also evaluates and compares the key characteristics of gas sensing systems made from different dimensional nanomaterials. Gas sensors are essential for detecting harmful and flammable gases, such as carbon monoxide (CO), volatile organic compounds (VOCs), nitrogen dioxide (NO₂), carbon dioxide (CO₂), hydrogen sulfide (H₂S), and chlorine (Cl₂). These gases pose significant problems for both developing and developed countries. Gas sensor technology is used to detect and alert the public to these gases. Gas sensors measure the composition or concentration of a gas. Monitoring and regulating these gases improves living standards, reduces health problems and mortality rates, and makes workplaces safer. Nanotechnology enables the development of effective sensors for various applications. Modern manufacturing techniques allow for the miniaturization of sensors while maintaining their sensing performance. The performance of nanomaterial-based gas sensors depends on the morphology and electronic properties of the nanomaterials. Various nanomaterials, such as SnO₂, In₂O₃, ZnO, graphene, reduced graphene oxide, Cu₂O, Co₃O₄, and TiO₂, have been studied for their gas sensing capabilities. The production of these sensors involves the use of binders or solvents to create the nanomaterials, followed by techniques such as drop-casting, screen-printing, or spin coating to assemble the sensor electrode's surface. Gas sensors are used in various applications, including monitoring trace gases like CO and NO₂, greenhouse gases, medical diagnostics, food and beverage industries, and security fields. They are also used in homes to detect combustible gases, liquefied petroleum gas (LPG) leaks, humidity, smoke, and CO in heating and cooking appliances. In factories and warehouses, gas sensors are used to sound an alarm if there is a gas leak. Gas sensors are also used to detect toxic gases like NOₓ, O₂, SO₂, O₃, hydrocarbons, or CO₂ in exhaust for environmental protection while monitoring the amount of oxygen in fuel mixtures used in engines in the automotive and aerospace industries. Nanostructured materials have been found to exhibit superior gas sensing capabilities comparable to their bulk counterparts. The size and properties of nanostructures used in gas sensors significantly impact their performance, influencing sensitivity, selectivity, and other sensing parameters. The reduction in size from microscale to nanoscale rapidly enhances the active surface area of sensors andThis review summarizes recent advances in nanostructured materials for gas sensing applications. Gas sensors are crucial in various industries, including pharmaceutical, medical engineering, clinical diagnostics, public safety, and food monitoring. Nanomaterials, due to their high surface-to-volume ratio and ability to adsorb gases, are excellent candidates for gas sensing. These sensors offer selectivity, reproducibility, durability, and cost-effectiveness. The review discusses various nanomaterials, their manufacturing processes, sensing mechanisms, and recent advancements. It also evaluates and compares the key characteristics of gas sensing systems made from different dimensional nanomaterials. Gas sensors are essential for detecting harmful and flammable gases, such as carbon monoxide (CO), volatile organic compounds (VOCs), nitrogen dioxide (NO₂), carbon dioxide (CO₂), hydrogen sulfide (H₂S), and chlorine (Cl₂). These gases pose significant problems for both developing and developed countries. Gas sensor technology is used to detect and alert the public to these gases. Gas sensors measure the composition or concentration of a gas. Monitoring and regulating these gases improves living standards, reduces health problems and mortality rates, and makes workplaces safer. Nanotechnology enables the development of effective sensors for various applications. Modern manufacturing techniques allow for the miniaturization of sensors while maintaining their sensing performance. The performance of nanomaterial-based gas sensors depends on the morphology and electronic properties of the nanomaterials. Various nanomaterials, such as SnO₂, In₂O₃, ZnO, graphene, reduced graphene oxide, Cu₂O, Co₃O₄, and TiO₂, have been studied for their gas sensing capabilities. The production of these sensors involves the use of binders or solvents to create the nanomaterials, followed by techniques such as drop-casting, screen-printing, or spin coating to assemble the sensor electrode's surface. Gas sensors are used in various applications, including monitoring trace gases like CO and NO₂, greenhouse gases, medical diagnostics, food and beverage industries, and security fields. They are also used in homes to detect combustible gases, liquefied petroleum gas (LPG) leaks, humidity, smoke, and CO in heating and cooking appliances. In factories and warehouses, gas sensors are used to sound an alarm if there is a gas leak. Gas sensors are also used to detect toxic gases like NOₓ, O₂, SO₂, O₃, hydrocarbons, or CO₂ in exhaust for environmental protection while monitoring the amount of oxygen in fuel mixtures used in engines in the automotive and aerospace industries. Nanostructured materials have been found to exhibit superior gas sensing capabilities comparable to their bulk counterparts. The size and properties of nanostructures used in gas sensors significantly impact their performance, influencing sensitivity, selectivity, and other sensing parameters. The reduction in size from microscale to nanoscale rapidly enhances the active surface area of sensors and