NCSAB AAL Recommendations

Recommendations of the North Carolina Science Advisory Board on Toxic Air Pollutants (NCSAB)

The following recommendations for Acceptable Ambient Levels (AALs) for toxic air pollutants are generally based on risk assessments conducted by the NCSAB.

  • Recommendations designated as "draft" are posted for a preliminary 30-day public comment period prior to being forwarded to the Rules division. The purpose of this public comment period is to solicit comments on the scientific basis of the recommendation; therefore only comments relating to the scientific rationale and method of the recommendation will be addressed. Comments must be submitted in writing before the closing date and time to the North Carolina Department of Environment and Natural Resources, Division of Air Quality contact listed below.
  • Recommendations designated as "pending" have been forwarded to the designated agency or regulatory body for further action.
  • Recommendations designated as "final" have been adopted.
Draft Recommendation*
(click on the document to open)
Closing Time for Comments
Eastern Time
Closing Date for Comments
20 NC Toxics Air Pollutants (TAPs) 5:00 pm July 13, 2015
Cadmium and Cadmium Compounds 5:00 pm April 3, 2014


Pending Recommendations
(click on the document to open)
Agency or Regulatory Body
Perfluorooctanoic Acid (PFOA) Division of Water Quality August 10, 2012


Final Recommendations
AAL Type
Date Finalized
Hydrogen Sulfide AAL Revision April 1, 2005
1, 3-Butadiene AAL Revision June 1, 2008
Acrylonitrile AAL Revision March 1, 2010
Arsenic and Inorganic Arsenic Compounds AAL Revision July 7, 2014


* Please direct comments to:
  Via email to:

Via mail to:

Joelle Burleson, Senior Regulatory Advisor

  NC Division of Air Quality
  1641 Mail Service Center
  Raleigh, NC 27699-1641
  Via fax to: Joelle Burleson, Senior Regulatory Advisor
  (919) 707-8720