What threshold is considered hazardous for lead in residential dust according to the standards discussed?

The threshold considered hazardous for lead in residential dust is established at 10 micrograms per square foot (ug/ft²). This standard is significant because it reflects the level of lead exposure that can pose health risks, particularly to children who are more vulnerable to the adverse effects of lead contamination. Elevated levels of lead in dust can indicate a risk of lead poisoning, which can have severe consequences, including developmental delays and cognitive impairments.

Understanding this threshold helps risk assessors evaluate properties for lead hazards effectively, ensuring that appropriate measures are taken to reduce lead exposure and protect public health. The distinction of 10 ug/ft² is supported by various health agencies as a benchmark for intervention, guiding lead hazard evaluations and remediation efforts in residential environments.