HR: 14:10h
AN: A13I-03    [Abstracts]
TI: New Approaches for Estimating Motor Vehicle Emissions in Megacities
AU: * Marr, L C
EM: lmarr@vt.edu
AF: Civil and Environmental Engineering, Virginia Tech, 411 Durham Hall, Blacksburg, VA 24061, United States
AU: Thornhill, D A
EM: munchie@vt.edu
AF: Civil and Environmental Engineering, Virginia Tech, 411 Durham Hall, Blacksburg, VA 24061, United States
AU: Herndon, S C
EM: herndon@aerodyne.com
AF: Center for Atmospheric and Environmental Chemistry, Aerodyne Research, Inc., 45 Manning Road, Billerica, MA 01821, United States
AU: Onasch, T B
EM: onasch@aerodyne.com
AF: Center for Atmospheric and Environmental Chemistry, Aerodyne Research, Inc., 45 Manning Road, Billerica, MA 01821, United States
AU: Wood, E C
EM: ezrawood@aerodyne.com
AF: Center for Atmospheric and Environmental Chemistry, Aerodyne Research, Inc., 45 Manning Road, Billerica, MA 01821, United States
AU: Kolb, C E
EM: kolb@aerodyne.com
AF: Center for Atmospheric and Environmental Chemistry, Aerodyne Research, Inc., 45 Manning Road, Billerica, MA 01821, United States
AU: Knighton, W B
EM: bknighton@chemistry.montana.edu
AF: Chemistry and Biochemistry, Montana State University, 308 Gaines Hall, Bozeman, MT 59717, United States
AU: Mazzoleni, C
EM: claudio@lanl.gov
AF: Los Alamos National Laboratory, ISR-2 Mail Stop D436, Los Alamos, NM 87545, United States
AU: Zavala, M A
EM: miguelz@mit.edu
AF: Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, United States
AU: Molina, L T
EM: ltmolina@mit.edu
AF: Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, United States
AU: Molina, L T
EM: ltmolina@mit.edu
AF: Molina Center for Energy and the Environment, 3262 Holiday Court, Suite 201, La Jolla, CA 92037, United States
AB: The rapid proliferation of megacities and their air quality problems is producing unprecedented air pollution health risks and management challenges. Quantifying motor vehicle emissions in the developing world's megacities, where vehicle ownership is skyrocketing, is critical for evaluating the cities' impacts on the atmosphere at urban, regional, and global scales. The main goal of this research is to quantify gasoline- and diesel-powered motor vehicle emissions within the Mexico City Metropolitan Area (MCMA). We apply positive matrix factorization to fast measurements of gaseous and particulate pollutants made by the Aerodyne Mobile Laboratory as it drove throughout the MCMA in 2006. We consider carbon dioxide; carbon monoxide; volatile organic compounds including benzene and formaldehyde; nitrogen oxides; ammonia; fine particulate matter; particulate polycyclic aromatic hydrocarbons; and black carbon. Analysis of the video record confirms the apportionment of emissions to different engine types. From the derived source profiles, we calculate fuel-based fleet-average emission factors and then estimate the total motor vehicle emission inventory. The advantages of this method are that it can capture a representative sample of vehicles in a variety of on-road driving conditions and can separate emissions from gasoline versus diesel engines. The results of this research can be used to help assess the accuracy of emission inventories and to guide the development of strategies for reducing vehicle emissions.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting