National Ambient Air Quality Standards for Lead - Review (US Environmental Protection Agency Regulation) (EPA) (2018 Edition) The Law Library presents the complete text of the National Ambient Air Quality Standards for Lead - Review (US Environmental Protection Agency Regulation) (EPA) (2018 Edition). Updated as of May 29, 2018 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. This book contains: - The complete text of the National Ambient Air Quality Standards for Lead - Review (US Environmental Protection Agency Regulation) (EPA) (2018 Edition) - A table of contents with the page number of each section