Why is inhalation exposure dangerous?

• A. Very fine particles easily enter the body and the thin lining of air sacs in the lungs can be damaged, allowing rapid movement into the bloodstream
• B. It causes only minor skin irritation
• C. It only affects the eyes
• D. It is the slowest route of exposure

Answer: (A)

When a pesticide is inhaled, very fine particles can bypass upper airway defenses and travel deep into the lungs. The lining of the air sacs (alveoli) is extremely thin to allow gas exchange, so the chemical can pass into the bloodstream quickly. Once in the blood, the pesticide is carried to many organs, potentially causing rapid and widespread toxic effects. Inhalation therefore poses a greater risk of systemic poisoning and respiratory irritation than other routes, because it provides fast, direct entry into the body. It’s not limited to skin or eye irritation, and it’s not the slowest route of exposure.