What does REI stand for, and where is it typically found?

• A. Reentry Interval; found on the pesticide label near entry-related instructions.
• B. Required Environmental Instruction; in the safety data sheet.
• C. Regional Entry Index; on the packaging.
• D. Recommended Exposure Index; in the label header.

Answer: (A)

REI stands for Reentry Interval. It’s the minimum time you must wait after a pesticide has been applied before entering the treated area without wearing protective clothing. This safety interval is specified on the pesticide label, typically near the entry-related instructions or in the precautions section. For example, if the label lists an REI of 24 hours, you should not reenter without the required PPE until 24 hours have passed since application. If you need to enter during the REI, you must follow the label’s PPE and entry requirements. This concept is distinct from other label terms like harvest intervals, which govern when produce can be harvested, rather than when workers can reenter treated spaces.