Under the Clean Air Act, EPA is required to carry out a periodic review and revision, as appropriate, of the air quality criteria and the primary and secondary standards for six criteria air pollutants, which include lead. EPA is currently reviewing the Lead National Ambient Air Quality Standards (NAAQS). Primary standards set limits to protect public health, including the health of "sensitive" populations such as asthmatics, children, and the elderly. Secondary standards set limits to protect public welfare, including protection against decreased visibility, damage to animals, crops, vegetation, and buildings. EPA has requested that CASAC provide additional consultative advice on aspects of the approach for quantitative exposure and risk analyses as a follow-up to prior CASAC Lead Panel advice on the Integrated Review Plan (IRP) for Review of the National Ambient Air Quality Standards for Lead, Volume 3: Planning for Quantitative Exposure/Risk Analyses (External Review Draft).
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