What is the restricted entry interval (REI) for non-agricultural applications of Chlorpyrifos Pro 2?

The correct choice indicates that unprotected individuals should stay out of treated areas until the spray has dried. This is important because Chlorpyrifos, a pesticide, can pose health risks to humans due to its neurotoxic effects. Ensuring the spray is dry helps minimize exposure to residues that could still be harmful while wet.

Understanding the nature of the pesticide and the mechanisms by which it operates underscores the necessity for this precaution. While certain pesticides may have less stringent requirements based on their composition or intended use, Chlorpyrifos is known for its potential impacts on human health, necessitating a more cautious approach. Therefore, maintaining a restriction until the treated surface is dry effectively protects individuals from unnecessary exposure to potentially harmful chemicals.

The other options suggest either immediate entry or shorter waiting periods that do not adequately account for the drying time necessary to ensure safety, which is essential when handling such a potent pesticide.