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Exposure Research

Human Exposure & Atmospheric Sciences Staff

Ram Vedantham

Title: Mathematician

EPA Division: Human Exposure and Atmospheric Sciences Division

EPA Branch: Environmental Characterization and Apportionment Branch

Ram’s expertise is in all areas of applied mathematics including statistical to evaluate, enhance and develop models related to source apportionment and human exposure. His emphasis has been on evaluating and improving existing models such as EPA Unmix, EPA PMF, EPA APTR and EPA SHEDS-PM models. Ram has been trained in the following research:

  • Applied Mathematics: Analysis of sound waves modeled by Nonlinear Partial Differential Equations, including Resonance effects
  • Optimal Control: Applications involving both linear and nonlinear equations
  • Statistics & probability: Moment generating functions, Noise analysis, Data Analysis


  • Ph.D., Applied Mathematics, University of California at Davis, Davis, CA 1995
  • M.S., Applied Mathematics, University of California at Davis, Davis, CA 1991
  • M.C.A., Computer Applications, Alagappa University, Kariakudi, India 1988
  • B.S., Mathematics, Madras University, Madras, India 1986

Professional Experience:

  • Mathematician, USEPA, ORD, NERL-HEASD, RTP, NC 2007-present
  • Programmer Analyst, Senior Staff, Lockheed Martin Corporation, RTP, Durham, NC 2006-2007
  • Systems Analyst, Science Applications International Corporation (SAIC), Falls Church, VA 2001-2006
  • Assistant Professor, Department of Mathematics and Statistics, University of North Carolina at Wilmington, Wilmington, NC 1995-2000

Select Awards and Honors:

  • Recipient of Summer Research Initiative Award (twice) at the University of North Carolina at Wilmington
  • Awarded Cahill Award for research projects involving vortices
  • Adjudged by graduating seniors as the single person having had most significant impact on their lives during their stay at UNCW

Select Publications:

  • Vedantham R., Norris G.A., Brown S.G., Roberts P., Combining continuous near–road monitoring and inverse modeling to isolate the effect of highway expansion on a school in Las Vegas. Atmospheric Pollution Research 3 (2012) 105-111.
  • Vedantham R., Norris G.A., and Duvall. R., Receptor and Hybrid Modeling Tools (book chapter), Encyclopedia of Environmetrics 2, Accepted.
  • Vedantham R., Olson, D. A., and Landis M.S. Source Identification of PM2.5 in Steubenville, Ohio Using a Hybrid Method for Highly Time-resolved Data, in preparation.
  • Pancras J.P., Landis M.S., Norris G.A., Vedantham R., and Dvonch, J. T., Source apportionment of ambidnt fine particulate matter in Detroit, Michigan, using hourly resolved PM chemical composition data,in preparation.
  • Henry R.C., Vette A., Norris G.A., Vedantham, R., Kimbrough S., Shores R.C., Separating the air quality impact of a major highway and nearby sources by nonparametric trajectory analysis.. Environ Sci Technol. 2011 Dec 15; 45(24): 10471-6
  • Pancras J.P., Vedantham R., Landis M.S., Norris G.A., Ondov J., Application of EPA unmix and nonparametric wind regression on high time resolution trace elements and speciated mercury in Tampa, Florida aerosol. JM. Environ Sci Technol. 2011 Apr 15; 45(8): 3511-8.

Published & Presented Research (1999-Present)

Contact Info:
Ram Vedantham
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: 919-541-5039
Email: vedantham.ram@epa.gov

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