What equipment is specifically mentioned for detecting methane?

The correct answer identifies a specific device designed for the detection of methane gas. A methane detector is specifically engineered to sense the presence of methane in the air, typically through the use of sensors that can detect the concentration of methane with high sensitivity and accuracy. These devices are often used in environments such as mines, landfills, or any area where methane may accumulate, providing essential safety monitoring to prevent hazards such as explosions or asphyxiation.

While other devices mentioned may have capabilities to detect various gases or monitor air quality, they are not specialized for methane detection. For instance, a carbon monoxide detector is tailored to sense carbon monoxide, while a gas chromatograph is used for analyzing gas composition but is not intended for direct, real-time methane detection. Similarly, a portable air quality monitor generally measures a range of pollutants, but it lacks the specific design focus on methane that a dedicated methane detector has. This specialization in detecting methane makes the methane detector the appropriate choice for this question.