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Exposure Research

Human Exposure & Atmospheric Sciences Staff

John Offenberg

Title: Associate Division Director for Air

EPA Division: Human Exposure and Atmospheric Sciences Division

EPA Branch: Immediate Office

John’s current research efforts are focused on secondary organic aerosol (SOA) formation, SOA composition, and the contribution of SOA to ambient particulate matter concentrations. These studies combine the use of indoor smog chamber experiments and the collection of field samples. Detailed analyses of chamber-generated SOA samples produced from a variety of parent hydrocarbons, including monoterpenes, sesquiterpenes, aromatics, and isoprene, have been used to develop methods for estimating SOA contributions in ambient particulate matter collected at several field sampling locations.


  • Ph.D., Atmospheric Chemistry, University of Maryland, 1998 Dissertation Title: “Semivolatile Organic Compounds in Urban and Over-water Atmospheres.”
  • B.S. with Honors, Major- Chemistry, Minor- Economics, Guilford College, 1993 Honors Thesis Title: “Synthesis and Identification of a Soluble Conducting Polymer.”

Professional Experience:

  • Acting Associate Division Director, USEPA, ORD, NERL-HEASD, RTP, NC 2010-present
  • Research Chemist, USEPA, ORD, NERL-HEASD, RTP, NC 2003-present
  • Henry and Camille Dreyfus Fellowship in Environmental Chemistry, Rutgers, The State University of New Jersey, New Brunswick, NJ 2001-2003
  • Senior Research Chemist (Senior Ingeniør), Product Toxicology and Environmental Impacts Division, The Norwegian State Oil Company (now: Statoil a.s.a.), Statoil Research Centre, Trondheim, Norway 1999-2001

Professional Societies and Affiliations:

  • American Association for Aerosol Research
  • American Chemical Society
  • International Association for Great Lakes Research

Select Awards and Honors:

  • US Department Of State Embassy Science Fellowship, Oslo, Norway, 2010
  • USEPA, Science and Technology Achievement Award, Level I Award, 2010
  • USEPA, Bronze Medal for Commendable Service, 2008, 2010
  • USEPA, NERL Special Achievement Award, 2010

Select Publications:

  • J.H.Offenberg, M. Lewandowski, E.O. Edney, T.E. Kleindienst, M. Jaoui. 2009. Influence of aerosol acidity on the formation of secondary organic aerosol from biogenic precursor hydrocarbons. Environmental Science and Technology, 43, 7742–7747. doi:10.1021/es901538e
  • M. Jaoui, T.E. Kleindienst, M.Lewandowski, J.H.Offenberg, E.O.Edney, E.W.Corse 2010. Organic tracers formed under acidic conditions from isoprene photooxidation. Atmospheric Environment. 1798-1805. doi: 10.1016/j.atmosenv.2010.01.018
  • T.E.Kleindienst, M.Lewandowski, J.H.Offenberg, E.O.Edney. M.Jaoui. 2010. Contribution of primary and secondary sources to organic aerosol and PM2.5 at SEARCH network sites. Journal of Air and Waste Management Association, 60, 11, 1388-1399. doi: 10.3155/1047-3289.60.11.1388
  • M. N. Chan, J. D. Surratt, A. W. H. Chan, K. Schilling, J. H. Offenberg, M. Lewandowski, E. O. Edney, T. E. Kleindienst, M. Jaoui, E. S. Edgerton, R. L. Tanner, S. L. Shaw, M. Zheng, E. M. Knipping, and J. H. Seinfeld, 2010. Influence of aerosol acidity on the chemical composition of Secondary Organic Aerosol from β-caryophyllene. Atmos. Chem. Phys. Discuss., 10, 29249-29289. doi: 10.5194/acp-11-1735-2011
  • J. H. Offenberg, M. Lewandowski, M. Jaoui, T. E. Kleindienst 2011. Contributions of Biogenic and Anthropogenic Hydrocarbons to Secondary Organic Aerosol during 2006 in Research Triangle Park, NC. Aerosol and Air Quality Research, 11: 99–108. doi:10.4209/aaqr.2010.11.0102
  • K. E. Yttri, D. Simpson, J. K. Nøjgaard, K. Kristensen, J. Genberg, K. Stenstr¨om, E. Swietlicki, R. Hillamo, M. Aurela, H. Bauer, J. H. Offenberg, M. Jaoui, C. Dye, S. Eckhardt, J. F. Burkhart, A. Stohl, and M. Glasius 2011. Source apportionment of the summer time carbonaceous aerosol at Nordic rural background sites Atmos. Chem. Phys., 11, 13339–13357. doi:10.5194/acp-11-13339-2011.

Published & Presented Research (1999-Present)

Contact Info:
John H. Offenberg
Human Exposure & Atmospheric Sciences Division
National Exposure Research Laboratory
US EPA Office of Research and Development
109 TW Alexander Drive
Research Triangle Park, NC 27709
Telephone: 919-541-2915
Email: offenberg.john@epa.gov

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