What is a Restricted-Entry Interval (REI) and why does it matter for workers?

• A. The time after an application during which entry is restricted or PPE must be worn, reducing exposure.
• B. The maximum shelf life of the product.
• C. The warranty period for the pesticide.
• D. The time before the product expires after mixing.

Answer: (A)

REI is the time after a pesticide has been applied during which entry is restricted or PPE must be worn to limit workers’ exposure. This requirement, specified on the product label, is there to protect workers from coming into contact with potentially harmful residues as the product dries or settles. It matters because entering too soon can cause skin absorption, inhalation, or other health problems, and it helps prevent acute pesticide illnesses and longer-term effects. The exact length of the interval varies by product, application method, rate, and conditions, so workers must always follow the label’s REI and PPE instructions.