2008 Revised Lead NAAQS
In 2008, the U.S. EPA determined that there was sufficient new evidence to warrant a significant lowering of the Pb NAAQS from 1.5µg/m3 (quarterly calendar average) to 0.15µg/m3 (rolling three-month average). EPA’s justification for this change stemmed from a variety of studies which a) directly link air concentrations of Pb to blood level concentrations; b) link blood level concentrations with health effects in humans (especially children); and c) link lower concentrations than the previous standard with environmental effects and human health effects. The new standard is aimed to protect not only human health but the environment as well.
Content lasted updated April 28, 2014