Which scenario falls under the category of "interim controls"?

Interim controls refer to measures taken to manage and reduce lead exposure in environments where lead hazards have been identified but where more permanent solutions, such as abatement or replacement, are not immediately feasible. These controls are typically intended to be temporary in nature until a more comprehensive remediation can be executed.

The choice of routinely cleaning lead dust from surfaces is a clear example of an interim control. This action helps to minimize lead exposure by physically removing lead particles from areas where people, especially children, may be at risk. Regular cleaning is crucial in maintaining a safer environment and is often part of a broader strategy while awaiting more permanent solutions, such as complete replacement of lead-containing materials.

In contrast, periodic monitoring of lead levels serves more as a risk assessment tool rather than a control mechanism, while replacing all windows or completely removing lead pipes are definitive abatement strategies that involve significant alterations to the property and are not considered interim measures.