Gas sensors are devices designed to detect and measure the presence of specific gases in the environment. They work by using various technologies, such as electrochemical, infrared, or semiconductor methods, to identify gas concentrations. Common applications include monitoring air quality, detecting leaks in industrial settings, and ensuring safety in confined spaces. These sensors can be found in many everyday products, including smoke detectors and carbon monoxide alarms. They play a crucial role in environmental monitoring and safety, helping to protect human health and prevent hazardous situations by providing real-time data on gas levels.