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Air and Climate Change Research

Michael Hays

Michael Hays is a physical scientist in the US EPA Office of Research and Development, National Risk Management Laboratory, Air Pollution Prevention and Control Division, (APPCD), Emissions Characterization and Prevention Branch (ECPB). Dr. Hays received his B.S. degree in Chemistry and Ph.D. in Analytical Chemistry/Environmental Studies from the University of Massachusetts Lowell. His postdoctoral fellow was at Case Western Reserve University.

Research Area
Since joining the EPA, the central research focus of Dr. Hays aims to develop physical and chemical characterization methods to advance fine particulate matter (PM2.5) analysis. His work implements large-volume injection, thermal desorption, and adapted solvent extraction techniques. Laboratory and field study objectives are devised in tandem to provide:

  1. organic chemical signatures of PM2.5 emissions from a wide array of combustion-related air pollution sources,
  2. input to source-receptor models used in apportionment efforts and for source reconciliation, and
  3. practical understanding of gas/solid phase partitioning of semivolatile organic pollutants.

His primary interests are: the chemical characterization of fine particulate matter from combustion sources, including heavy-duty diesel engines, aircraft turbine engines, residential wood combustion, wildfire, and various industrial stacks and particle-size chemistry and instrumentation.

Prior to joining the ECPB at EPA, he spent two years as a postdoctoral research associate at Case Western Reserve University in Cleveland, OH, where he studied economical and efficient sorbents for uptake of sulfur dioxide.

The chemical characterization of fine particulate matter from combustion sources, including heavy-duty diesel engines, aircraft turbine engines, residential wood combustion, wildfire, and various industrial stacks. Particle-size chemistry and instrumentation.

Web Site: Source Characterization

Contact Information
Michael Hays (hays.michael@epa.gov)

Selected Publications

  • Ma, Y., M.D. Hays, C.G. Geron, J.T. Walker, and M. J Gatari. (2010). "Fast Two-dimensional GC-MS with Thermal Extraction for Anhydro-Sugars in Fine Aerosols." Atmos. Chem. Phys., Discuss. 10(1): 153-182.
  • Menetrez, M.A., K.K. Foarde, R.K. Esch, T.D. Schwartz, T.R. Dean, M.D. Hays, S.H. Cho, D.A. Betancourt, and S.A. Moore. (2009). "An Evaluation of Indoor and Outdoor Biological Particulate Matter." Atmos. Environ., 43(34): 5476-5483.
  • Vander Wal, R. L., Bryg, V.M., and Hays, M.D. (2009). "Fingerprinting Soot (towards source identification): Physical Structure and Chemical Composition." J. Aerosol Sci., doi:10.1016/j.jaerosolsci.2009.08.008.
  • Saxena, R.K., M.C. Schladweiler, M.M. McClure, M.D. Hays, U.P. Kodavanti and M.I. Gilmour. (2009). "Clearance of Diesel Exhaust Particles from the Lungs of Wistar Kyoto and Spontaneously Hypertensive Rats." Tox Sci., 111(2): 392-401.
  • Hays, M.D., L. Beck, P. Barfield, R. Willis, M. Landis, R. Stevens, W. Preston, and Y. Dong. (2009). "Physical and Chemical Characterization of Residual Oil-fired Power Plant Emissions." Energy Fuels, 23(5): 2544-2551.
  • Kleeman, M.J., S.G. Riddle et al. (2009). "Source Apportionment of Fine (PM1.8) and Ultrafine (PM0.1) Sirborne Particulate Matter during a Severe Winter Pollution Episode." Environ. Sci. and Technol., 43(2): 272-279.
  • Bullock, K.R., R.M. Duvall, G..A. Norris, S.R. McDow, and M.D. Hays. (2008). "Evaluation of the CMB and PMF Models using the Organic Molecular Markers in Fine Aerosols Collected for the Pittsburgh Air Quality Study." Atmos. Environ., 42(29): 6897-6904.
  • Ma, Y. and M.D. Hays. (2008). "Thermal Extraction–two-dimensional Gas Chromatography–mass Spectrometry with Heart-cutting for Nitrogen Heterocyclics in Biomass Burning Aerosols." J. Chromatogr., A., 1200(2): 228-234.
  • Baldauf, R., E. Thoma, V. Isakov et al. (2008). "Traffic and Meteorological Impacts on Near-road Air Quality: Summary of Methods and Trends from the Raleigh Near-road Study." J. Air Waste Manage. Assoc., 58: 865-878.
  • Saxena, R.K., M.I. Gilmour, M.D. Hays. (2008). "Isolation and  Quantitative Estimation of Diesel Exhaust and Carbon Black Particle Uptake by Lung Epithelial Cells and Alveolar Macrophages in Vitro." Biotechniques, 44(6): 799-805.
  • Hays, M.D., Beck, L., Barfield, P., Lavrich, R.J., Dong, Y., and Vander Wal, R. L. (2008). "Physical and chemical characterization of residential oil boiler emissions." Environ. Sci. and Technol., 42(7): 2496-2502.  
  • Kleeman, M.J., M.A. Robert, S.G. Riddle, P.M. Fine, M.D. Hays, J.J. Schauer and M.P. Hannigan. (2008). "Size Distribution of Trace Organic Species Emitted from Biomass Combustion and Meat Charbroiling." Atmos. Environ., 42(13): 3059-3075.
  • Volckens, J., D. A. Olson, and M.D. Hays. (2007). "Carbonaceous Species Emitted from Handheld two-stroke Engines." Atmos. Environ., 42(6): 1239-1248.
  • Chow, J.C., J.Z. Yu, J.G. Watson, S.S.H. Ho, T.L. Bohannan, M.D. Hays and K.K. Fung. (2007). "The Application of Thermal Methods for Determining cChemical Composition of Carbonaceous Aerosols: A Review." J. Environ. Sci. Health, Part A, 42(11): 1521-1541.
  • Lavrich, R.L. and M.D. Hays. (2007). "Validation Studies of Thermal Extraction-GC-MS Applied to Source Emissions Aerosols: 1. Semivolatile Snalyte-nonvolatile Matrix Interactions." Anal. Chem. 79(10): 3635-3645.

Professional Societies

  • American Chemical Society,
  • American Association of Aerosol Research,
  • Air and Waste Management Association,
  • Sigma Xi,
  • National Honor Society, and
  • American Geophysical Union

Selected Awards and Honors

  • EPA Bronze Medal  – Rear Roadway Research (2008)
  • NRMRL Teamwork Award (2007)
  • EPA/ORD Scientific and Technological Achievement Award (2004, 2005, 2008)
  • EPA Superior Accomplishment Recognition Award (2002-2008)
  • NRMRL Team Performance Award for work on Fine PM Research  (2002)
  • Professional Development Award from the Graduate School (1996)

Air and Climate Change Research | Water Research | Ecosystems Restoration Research | Land Research | Technology: Sustainable Technologies Research, Environmental Technology Verification Program (ETV), and Technology Assessments

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