What is the national primary and secondary ambient air quality standard for lead?

The national primary and secondary ambient air quality standard for lead is established at 0.15 micrograms per cubic meter (ug/m3). This standard serves two key purposes: it aims to protect public health, particularly vulnerable populations such as children and pregnant women, and it seeks to protect the environment from the harmful effects of lead pollutants. The standard is designed to limit lead concentrations in the air over a defined period, ensuring that exposure to lead is minimized to prevent neurological and behavioral problems associated with lead exposure.

Setting this level is crucial as lead can accumulate in the body over time, leading to serious health issues, and it can impact air quality and environmental health. The designated standard reflects the consensus among scientific studies and regulatory assessments regarding safe exposure levels to lead in ambient air.