What is a re-entry interval (REI) and why is it important for worker safety after pesticide application?

• A. REI is the time required for the pesticide to dry on surfaces.
• B. REI is the minimum time before workers may re-enter a treated area with no protective equipment.
• C. REI is the minimum time before re-application is allowed.
• D. REI is the maximum allowable resistance index.

Answer: (B)

A re-entry interval is a safety time limit after a pesticide is applied, indicating how long workers should wait before entering the treated area without protective clothing. This matters because residues on surfaces and in the air can pose risks to skin, eyes, and the lungs soon after application. The product label sets this minimum waiting period to reduce exposure; after the interval, entry without PPE is allowed according to the label. If you must enter during the interval, you would follow the label’s PPE requirements and precautions. The other ideas don’t describe the safety waiting period for entering a treated area: drying time, the time before re-applying, or a resistance index.