Abbreviations Acid A chemical which neutralizes alkalies forming salts. Acids have low pH's. Acute Having a rapid onset and progression. Alkali A chemical which neutralizes acids forming salts.
Alkalis have high pH's.
Alkalis are corrosive. Containing no water. Asphyxiation Injury or death caused by the replacement of oxygen in the environment by another gas or vapor. Awareness Level Trained First responders at the awareness level are those persons who, in the course of their normal duties may be the first on the scene of an emergency involving hazardous materials. First responders at the awareness level are expected to recognize hazardous materials presence, protect themselves, call for trained personnel, and secure the area.