Which statement is true regarding indoor ventilation and OC spray effects?

• A. Improved ventilation has no effect on symptom duration.
• B. Ventilation worsens symptoms if misused.
• C. Poor indoor ventilation increases spray concentration and prolongs symptoms.
• D. Ventilation is irrelevant indoors.

Answer: (C)

When OC spray is released indoors, how well the air is replaced or circulated dictates how long people are exposed. In a space with poor ventilation, spray particles linger, keeping the concentration high and leading to more inhalation and longer-lasting symptoms. Good ventilation dilutes the irritant by bringing in fresh air and removing contaminated air, so exposure drops and symptoms resolve more quickly. That’s why the statement about poor indoor ventilation increasing spray concentration and prolonging symptoms is the most accurate. The other ideas don’t fit the physics of airborne irritants: improving ventilation does affect symptom duration, ventilation isn’t inherently harmful if used properly, and ventilation isn’t irrelevant indoors.