The chemicals listed in highlighted type in the Emergency Response Guidebook were selected because:

• A. They present a toxic inhalation hazard.
• B. Their vapors are explosive.
• C. They create corrosive vapors.
• D. The actions listed in the orange section will not be effective for these chemicals.

Answer: (A)

The highlighted type is used to flag chemicals that pose a toxic inhalation hazard. In the ERG, these substances are marked so responders recognize that inhalation exposure can cause serious harm or death, and the primary focus must be on preventing inhalation, evacuating the area, and using appropriate respiratory protection. Other hazards like explosive or corrosive vapors may be present with some chemicals, but they aren’t what drives the highlighting. And the orange-section actions are still relevant for these releases; highlighting does not mean those actions won’t be effective.