Which of the following levels of lead dust is considered hazardous in residential areas by the US EPA?

The US EPA has established guidelines for lead dust levels in residential areas to ensure safety and minimize health risks, particularly for vulnerable populations such as children and pregnant women. The critical threshold for lead dust that is considered hazardous is 1.0 mg/cm². This level indicates a significant concern for potential lead exposure, which can lead to serious health problems, including developmental delays, cognitive impairment, and other significant health issues.

This threshold is based on extensive research regarding the harmful effects of lead exposure and aims to create an environment where the risk of lead poisoning is minimized. Values above this level prompt further investigation and remediation actions to eliminate or reduce lead contamination, thereby protecting public health.