National Ambient Air Quality Standards (NAAQS) for Lead (Pb)
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On September 16, 2016, based on its review of the air quality criteria for lead (Pb), the Environmental Protection Agency issued a decision to retain the existing 2008 standards without revision. The primary and secondary Pb standards are 0.15 micrograms per cubic meter Pb in total suspended particles as a 3-month average.
01/05/2015 - Proposal to Retain the Current NAAQS for Pb