Atmos. Chem. Phys. Discuss., 7, 3113-3177, 2007
www.atmos-chem-phys-discuss.net/7/3113/2007/
doi:10.5194/acpd-7-3113-2007
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Air quality in North America's most populous city – overview of MCMA-2003 Campaign
L. T. Molina1,2, C. E. Kolb3, B. de Foy1,2,4, B. K. Lamb5, W. H. Brune6, J. L. Jimenez7,8, and M. J. Molina1,9
1Department of Earth, Atmospheric and Planetary Science, Massachusetts~Institute of Technology, Cambridge, MA, USA
2Molina Center on Energy and Environment, La Jolla, CA, USA
3Aerodyne Research, Inc., Billerica, MA, USA
4Saint Louis University, St. Louis, MO, USA
5Laboratory for Atmospheric Research, Department of Civil and Environmental Engineering, Washington State University, Pullman, WA, USA
6Department of Meteorology, Pennsylvania State University, University Park, PA, USA
7Dept. of Chemistry and Biochemistry, University of Colorado at Boulder, Boulder, CO, USA
8Cooperative Institute for Research in the Environmental Sciences (CIRES), University of Colorado at Boulder, Boulder, CO, USA
9Department of Chemistry and Biochemistry, University of California at San Diego, San~Diego, CA, USA

Abstract. Exploratory field measurements in the Mexico City Metropolitan Area (MCMA) in February 2002 set the stage for a major air quality field measurement campaign in the spring of 2003 (MCMA-2003). Involving over 100 scientists from more than 30 institutions in Mexico, the United States and Europe, MCMA-2003 revealed important new insights into the meteorology, primary pollutant emissions, ambient secondary pollutant precursor concentrations, photochemical oxidant production and secondary aerosol particle formation in North America's most populated and polluted megacity. A description of meteorological and atmospheric chemistry and aerosol microphysics measurements performed during MCMA-2003 is presented. More than three dozen published or submitted MCMA-2003 research papers are reviewed and key discoveries pertinent to understanding and improving air quality in Mexico City and similar megacities in the developing world are summarized.

Citation: Molina, L. T., Kolb, C. E., de Foy, B., Lamb, B. K., Brune, W. H., Jimenez, J. L., and Molina, M. J.: Air quality in North America's most populous city – overview of MCMA-2003 Campaign, Atmos. Chem. Phys. Discuss., 7, 3113-3177, doi:10.5194/acpd-7-3113-2007, 2007.
 
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