1Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA
2University of Colorado, Boulder, CO, USA
3Department of Chemistry, University of California at Irvine, Irvine, CA, USA
4National Center for Atmospheric Research, Boulder, CO, USA
5Department of Oceanography, University of Hawaii, USA
6Department of Chemistry, University of Montana, Missoula, MT, USA
7Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA
8Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA, USA
*now at: Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, Switzerland
**now at: AAAS Science and Technology Policy Fellow, United States Environmental Protection Agency, Washington, D.C., USA
Received: 18 Nov 2008 – Published in Atmos. Chem. Phys. Discuss.: 28 Jan 2009 – Published: 24 Jul 2009
Abstract. Observations during the 2006 dry season of highly elevated concentrations of cyanides in the atmosphere above Mexico City (MC) and the surrounding plains demonstrate that biomass burning (BB) significantly impacted air quality in the region. We find that during the period of our measurements, fires contribute more than half of the organic aerosol mass and submicron aerosol scattering, and one third of the enhancement in benzene, reactive nitrogen, and carbon monoxide in the outflow from the plateau. The combination of biomass burning and anthropogenic emissions will affect ozone chemistry in the MC outflow.
Citation: Crounse, J. D., DeCarlo, P. F., Blake, D. R., Emmons, L. K., Campos, T. L., Apel, E. C., Clarke, A. D., Weinheimer, A. J., McCabe, D. C., Yokelson, R. J., Jimenez, J. L., and Wennberg, P. O.: Biomass burning and urban air pollution over the Central Mexican Plateau, Atmos. Chem. Phys., 9, 4929-4944, doi:10.5194/acp-9-4929-2009, 2009.