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Lead Designations

Lead Designations Guidance

EPA provided guidance for making the lead designations process in the preamble for the lead National Ambient Air Quality Standards (NAAQS) final rulemaking (73 FR 6694; November 12, 2008). On August 21, 2009, EPA provided additional information on the timeline for designating areas and identified where key designation – related subjects can be found in the lead NAAQS preamble.

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