This rule establishes air quality designations for certain areas in the United States for the 2008 lead (Pb) National Ambient Air Quality Standards (NAAQS). Based on air quality monitoring data, EPA is issuing this rule to identify areas that do not meet the 2008 Pb NAAQS and areas that contribute to Pb air pollution in a nearby area that does not meet the Pb NAAQS. EPA is deferring designation for all other areas of the United States, including Indian country, pending collection and review of additional data from recently deployed Pb monitors. The Clean Air Act (CAA) requires areas designated nonattainment by this rule to undertake certain planning and pollution control activities to attain the standards as quickly as reasonably possible.