What is the threshold limit for lead in dust on floors according to the EPA?

The threshold limit for lead in dust on floors according to the EPA is established to ensure safety and public health, particularly in environments where children may be present. The correct value is 10 micrograms per square foot. This limit is based on significant research regarding the health risks associated with lead exposure, particularly in children, who are more vulnerable to the toxic effects of lead.

This threshold serves as a guideline for remediation efforts in homes and facilities where lead may be a concern, especially those built before the ban on lead paint in 1978. Adhering to this standard helps to minimize the risks associated with lead dust exposure and is a critical component of lead hazard control strategies.

In contrast, thresholds lower or higher than this limit do not align with the current EPA standards and are not recognized as appropriate for assessing lead dust hazards in these contexts. Thus, the identification of 10 micrograms per square foot as the correct answer reflects the established standards that guide lead hazard evaluations and interventions.