The gas sensor is a remarkable device that detects and measures the presence and concentration of various gases in the environment. It functions based on different principles such as chemical reactions, electrical conductivity changes, or optical properties. There are diverse types of gas sensors, like those for detecting carbon monoxide, methane, ammonia, and volatile organic compounds. They are widely applied in many areas. In industrial settings, they monitor gas levels to ensure workplace safety and prevent explosions. In daily life, they can be found in gas leak detectors at home. Additionally, in environmental protection, they help measure air pollution levels, providing crucial data for air quality assessment and control strategies.