Based on the Environmental Protection Agency's (EPA's) review of the air quality criteria and the national ambient air quality standards (NAAQS) for lead (Pb), the EPA is retaining the current standards, without revision.
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Review of the National Ambient Air Quality Standards for Lead
Based on the Environmental Protection Agency's (EPA's) review of the air quality criteria and the national ambient air quality standards (NAAQS) for lead (Pb), the EPA is retain...
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81 FR 71906
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“Review of the National Ambient Air Quality Standards for Lead,” thefederalregister.org (October 18, 2016), https://thefederalregister.org/documents/2016-23153/review-of-the-national-ambient-air-quality-standards-for-lead.