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Exposure Research

Human Exposure & Atmospheric Sciences Staff

Gary Norris

Title: Branch Chief

EPA Division: Human Exposure and Atmospheric Sciences Division

EPA Branch: Environmental Characterization and Apportionment

Environmental Forensics is an integrated approach encompassing sampling, analytical methods and analysis, mathematical modeling, and evaluation. A wide variety of studies are being led by Gary’s branch: particulate matter, Hg wet and dry deposition, Hg speciation, nano Cerium fuel additives, VOCs, indoor mold, near road health effects, and Hydraulic Fracturing and Oil and Gas impacts on water and air. Gary’s emphasis is on the development of receptor modeling and chemometric tools which are used to quantify the sources contributing to a wide range of environmental samples.


  • Ph.D., Civil Engineering, University of Washington, 1998
  • M.S.E., Civil Engineering, University of Washington, 1994
  • B.S., Environmental Engineering, California Polytechnic State University, 1992

Professional Experience:

  • Branch Chief, USEPA, ORD, NERL – HEASD, RTP, NC (Acting 2008 to 2010; Permanent 2010 to present)
  • Physical Scientist, USEPA, ORD, NERL-HEASD, RTP, NC 2005 – 2008
  • Acting Associate Division Director for Air Research, USEPA, ORD, NERL-HEASD, RTP, NC 2004-2005
  • Physical Scientist, USEPA, ORD, NERL-HEASD, RTP, NC 1998-2004

Select Awards and Honors:

  • USEPA, EPA Honor Award, Silver Medal, 2006
  • USEPA, ORD Bronze Medal, 2008
  • USEPA, Scientific and Technological Achievement Award Level III, 2008
  • USEPA, Scientific and Technological Achievement Award Honorable Mention, 2009
  • USEPA, ORD Silver Medal, 2010
  • USEPA, NERL Special Achievement Award, 2010

Select Presentations:

  • Norris, G.A.; Duvall, R.A.; Graney, J.R.; Turner, J.R.; Vedantham, R.; Landis, M.S. (2008) “Identification of Local PM2.5 Sources using Highly Time Resolved Samples and a New Hybrid Receptor Modeling Framework.” AAAR Annual Conference, Orlando, FL.
  • Conny, J.M.; Norris, G. (2009) “A Comparison of Conventional Scanning Electron Microscopy (SEM) and Focused Ion-Beam SEM of Ambient Air Particles From Geographically-Distinct Urban Areas in the U.S.,” American Geophysical Union Conference, San Francisco , CA.
  • Duvall, R.M.; Norris, G.A.; Kovalcik, K.; McGee J.K.; Davies, D.; Terrel, D.; Gilmour, M.I. (2010) “ Sources of PM Collected at Varying Distances from an Urban Highway, “ AAAR Annual Conference, Portland, OR.
  • Duvall, R.M.; Norris, G.A.; McGee, J.K.; Devlin, R.; Gilmour, M.I (2011) “Source Apportionment of Particulate Matter in Cleveland, OH and Associations with Toxicological Outcomes,” AAAR, Annual Conference, Orlando, FL.

Select Publications:

  • Vette, A.; Burke, J.; Norris, G.; Landis, M.; Stuart Batterman, S.; Breen, M.; Isakov, V.; Lewis, T.; Gilmour, M.I.; Kamal, A; Hammond, D.; Vedantham, R.; Bereznicki, S.; Tian, N.; Carry Croghan, C. (2012) The near-road exposures and effects of urban air pollutants study (NEXUS): Study design and methods, Sci Total Environ, in press.
  • Pancras, J.P.; Landis, M.S.; Norris, G.A.; Vedantham, R.; Dvonch, J.T. (2012) Source apportionment of ambient fine particulate matter in Dearborn, Michigan, using hourly resolved PM chemical composition data, Sci Total Environ, in press.
  • Ault, A.P.; Peters, T.M.; Sawvel, E.J.; Gary S. Casuccio, G.S.; Willis, R.D.; Norris, G.A.; Vicki H. Grassian (2012) Single-Particle SEM-EDX Analysis of Iron-Containing Coarse Particulate Matter in an Urban Environment: Sources and Distribution of Iron within Cleveland, Ohio, Environ. Sci. Technol. 2012, 46, 4331-4339.
  • Brown, S. G.; T. Lee, T.; Norris, G.A.; Roberts, P.T.; Collett Jr. , . J.L.; Paatero, P.; Worsnop, D.R. (2012) “Receptor modeling of near-roadway aerosol mass spectrometer data in Las Vegas, Nevada, with EPA PMF,” Atmos. Chem. Phys, Accepted for publication.
  • Olson, D.A.; Vedantham R.; Norris, G.A.; Brown S.G.; Roberts, P. (2012) “ Determining source impacts near roadways using wind regression and organic source markers,” Atmos. Environ., 47: 261-268.
  • Duvall, R.M., Norris, G.A., Burke, J.M., Olson, D.A., Vedantham, R., Williams, R. (2012) “Determining spatial variability in PM2.5 source impacts across Detroit, MI,” Atmos. Environ, 47(1), 491-498.

Published & Presented Research (1999-Present)

Contact Info:
Garry Norris
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: 919-541-1519
Email: norris.gary@epa.gov

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