4 The record articles

U.S. EPA Proposes to Strengthen Lead NAAQS

Posted: May 19th, 2008

Authors: Kristin G. 

On May 2, 2008 and in a subsequent May 20, 2008 Federal Register notice, U.S. EPA proposed revisions to the Lead (Pb) National Ambient Air Quality Standards (NAAQS).  Highlights of the proposal include:

  • The Pb NAAQS primary standard is being proposed in the 0.1 – 0.3 micrograms/cubic meter range (from the existing 1.5 micrograms/cubic meter standard).  The standard is proposed on a total suspended particulate (TSP) basis. The secondary standard will be same as primary standard.  Comments are being accepted on the range.
  • U.S. EPA will consider comments on alternative levels up to 0.5 micrograms/cubic meter and below 0.1 micrograms/cubic meter, as Pb in TSP or as Pb in PM10.
  • U.S. EPA is proposing two (2) averaging time options.
  • U.S. EPA is looking to improve the existing Pb monitoring network.
  • U.S. EPA will consider comments on monitoring Pb on a PM10 basis.
  • U.S. EPA will accept public comment until July 21, 2008, however comments related to the information collection request (ICR) are due by June 19, 2008.
  • Two (2) public hearings will be held on June 12, 2008: in St. Louis and in Baltimore.

U.S. EPA must issue a final decision on the Pb standard by September 15, 2008.


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