What do green highlighted substances in the ERG indicate?

Green highlighted substances in the Emergency Response Guidebook (ERG) specifically indicate materials that may pose a toxic inhalation hazard (TIH). These substances can release harmful vapors when released into the environment, which can be extremely dangerous to both emergency responders and the public.

When responding to incidents involving these substances, it is essential for fire service personnel and other emergency responders to be aware of the risks associated with inhaling toxic fumes. Proper protective equipment and protocols need to be followed to mitigate exposure and ensure safety.

The other choices refer to different hazard classifications, such as those relating to reactivity, explosiveness, or instability, but they do not specifically align with the significance attributed to the green highlighting in the ERG. Understanding the categorization of materials helps responders quickly assess the situation and act accordingly to minimize danger.