Which is a common method for detecting hazardous gases?

Using infrared cameras is a common method for detecting hazardous gases because these devices can identify the presence of gases by detecting their specific wavelengths of infrared radiation. Many hazardous gases have distinct absorption spectra; the infrared cameras can pick up these wavelengths when gases are present, allowing first responders to detect leaks or accumulations of harmful substances. This method provides a non-invasive way to monitor gas levels without the need for direct contact, which is crucial in maintaining safety.

In contrast, setting off a fire alarm system is primarily designed to detect smoke and flames rather than specific hazardous gases, making it less appropriate for that purpose. Utilizing personal protective equipment alone does not facilitate gas detection; rather, it serves to protect personnel from exposure to hazardous conditions. Conducting a visual inspection may help spot obvious signs of a leak or danger, but it is not a reliable method for detecting gases that may be invisible or odorless. Thus, infrared cameras stand out as an effective technology specifically designed for gas detection in hazardous environments.