Which of the following is a recognized method of exposure?

• A. Inhalation
• B. Evaporation
• C. Filtration
• D. Condensation

Answer: (A)

Exposure is the way a hazardous material can enter the body, and inhalation is a key route because many chemicals released during incidents become airborne as vapors, gases, or fine aerosols. Breathing these substances allows rapid entry into the lungs and bloodstream, so inhalation exposure is a central concern in hazmat response, guiding air monitoring, respirator use, and ventilation controls. The other terms describe processes or equipment rather than a route of entry: evaporation and condensation are phase changes that can influence how much material becomes airborne, but they aren’t themselves routes of exposure; filtration is a method to remove contaminants, not a way for the body to take in hazard.