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Department of Chemistry and Biochemistry

Atmospheric Chemistry Research Group


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Areas of Research

Our group studies atmospheric pollutants in both the gas-phase and in particulate matter (PM). Our work includes both field and lab studies. Ongoing measurements include smog chamber studies to understand the fate of volatile organic compounds as they degrade in the atmosphere, flux measurements to determine emission rates of pollutant from agricultural sources, and measurements of organics and reactive oxygen species in particulate matter (PM) to investigate aerosol ageing. We are also working with biomedical scientists to investigate potential health effects of particle-borne pollutants.

Recent Publications

  1. Middala, S.; Campbell, S.; Olea, C.; Scruggs, A.; Hasson, A. S., Kinetics and mechanism of the reaction of propylene oxide with chlorine atoms and hydroxy radicals. International Journal of Chemical Kinetics 2011, 43 (9), 507-521
  2. Alanis, P.; Ashkan, S.; Krauter, C.; Campbell, S.; Hasson, A. S., Emissions of volatile fatty acids from feed at dairy facilities. Atmospheric Environment 2010, 44 (39), 5084-5092.
  3. Baasandorj, M.; Papanastasiou, D. K.; Talukdar, R. K.; Hasson, A. S.; Burkholder, J. B., (CH3)3COOH (tert-butyl hydroperoxide): OH reaction rate coefficients between 206 and 375 K and the OH photolysis quantum yield at 248 nm. Physical Chemistry Chemical Physics 2010, 12 (38), 12101-12111.
  4. Chung, M. Y.; Beene, M.; Ashkan, S.; Krauter, C.; Hasson, A. S., Evaluation of non-enteric sources of non-methane volatile organic compound (NMVOC) emissions from dairies. Atmospheric Environment 2010, 44 (6), 786-794.

Recent Presentations

  1. Maitra, S.; Jackson, J.J.; Hasson, A.S.  Synthesis, characterization, and gas phase study of isoprene nitrates. 241st American Chemical Society National Meeting, Anaheim CA, March 27th-31st, 2011.

  2. Cole, J.; Middala, S.; Vu, K.;Nana, L.: Scruggs, A; Olea, C.; Hasson, A. Emissions Measurements of Selected VOCs from a Central California Dairy . 28th Informal Symposium on Kinetics and Photochemical Processes in the Atmosphere, UC Irvine, March 3rd, 2011
  3. Hasson, A. Organic Carbon Chemistry in the Valley Atmosphere. Particulate Pollution in the San Joaquin Valley: Translating Science into Policy, Fresno CA, June 9th-10th, 2010.

Current Funding

  1. Emissions of Greenhouse Gases from Dairy Facilities. (2011-14)
    Funded by: Agricultural Research Initiative ($297,000)
    Role: Principal Investigator

  2. Chemistry Graduate Scholarship Program (GRASP) at Fresno State. (2011-16)
    Funded by: National Science Foundation ($460,000)
    Role: Principal Investigator
  3. Probing the Intrinsic Ability of Particles to Generate Reactive Oxygen Species and the Effect of Physiologically Relevant Solutes. (2011-14)
    Funded by: California Air Resources Board ($301,019)    
    Role: Campus Principal Investigator (Budget: $48,916)
  4. RUI: Mechanistic and Kinetic Studies of the Atmospheric Chemistry of Isoprene and its First-Generation Products. (2010-13)
    Funded by: National Science Foundation ($251,000)
    Role: Principal Investigator
  5. Air Quality Impacts Of Dairy Facilities In Central California. (2010-13)
    Funded by: USDA ($597,000)
    Role: Principal Investigator
  6. Mentoring, Education, Training, Research and Outreach (METRO): A co-ordinated approach to increase diversity in the Geosciences (OEDG Type II). (2009-13)
    Funded by: National Science Foundation ($1,400,000)
    Role: Principal Investigator
  7. Interdisciplinary Scientific Environmental Technology Co-operative Science Center. (2006-11)
    Funded by: National Oceanic and Atmospheric Administration ($12,500,000)
    Role: Project Principal Investigator (Budget: $445,852)