In the NIOISH Pocket Guide, which item is NOT a listed parameter?

• A. Ionization potential
• B. Chemical formula
• C. Reactivity with water
• D. Lower explosive limit

Answer: (C)

Understanding how the NIOSH Pocket Guide presents chemical information helps you see why this item isn’t a listed parameter. The Pocket Guide organizes data in a fixed set of labeled fields that appear in the quick-reference data table: you’ll see identifiers like the chemical formula and practical hazard indicators such as the lower explosive limit. These fields are designed for rapid hazard assessment and comparison. More detailed chemical properties may be mentioned in broader contexts, but the data table emphasizes practical, commonly used parameters rather than every possible property. Information about how a substance reacts with water isn’t shown as a separate, labeled parameter in that table; instead, water-reactivity is typically described qualitatively in the stability or reactivity sections. Because reactivity with water isn’t a discrete listed parameter in the Pocket Guide’s data table, it’s the item that does not belong among the listed parameters.