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Lead (Pb) Standards -
Table of Historical Pb NAAQS

History of the National Ambient Air Quality Standards for Lead
During the Period 1978-2008

Final Rule/Decision Primary/ Secondary Indicator Averaging Time Level (1) Form

43 FR 46246
Oct 5, 1978
Primary and Secondary Pb-TSP (2) Calendar Quarter 1.5 µg/m3 Not to be exceeded
    Feb 21, 1991 – Agency released multimedia “Strategy for Reducing Lead Exposures” (3)

73 FR 66964
Nov 12, 2008
Primary and Secondary Pb-TSP 3-month period 0.15 µg/m3 Not to be exceeded

(1) Units of measure are micrograms per cubic meter of air (µg/m3).

(2) Lead in total suspended particles (Pb-TSP).

(3) Available:  http://www.epa.gov/ttn/naaqs/standards/pb/data/leadstrategy1991.pdf.

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