ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-12-8751-2012 Contribution of garbage burning to chloride and PM<sub>2.5</sub> in Mexico City Li G. 1 2 3 Lei W. 1 Bei N. 1 4 Molina L. T. 1 3 Molina Center for the Energy and the Environment, La Jolla, CA, USA Key Laboratory of Aerosol, SKLLQG, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China Massachusetts Institute of Technology, Cambridge, MA, USA School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, China 27 09 2012 12 18 8751 8761 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/12/8751/2012/acp-12-8751-2012.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/12/8751/2012/acp-12-8751-2012.pdf

The contribution of garbage burning (GB) emissions to chloride and PM<sub>2.5</sub> in the Mexico City Metropolitan Area (MCMA) has been investigated for the period of 24 to 29 March during the MILAGRO-2006 campaign using the WRF-CHEM model. When the MCMA 2006 official emission inventory without biomass burning is used in the simulations, the WRF-CHEM model significantly underestimates the observed particulate chloride in the urban and the suburban areas. The inclusion of GB emissions substantially improves the simulations of particulate chloride; GB contributes more than 60% of the observation, indicating that it is a major source of particulate chloride in Mexico City. GB yields up to 3 pbb HCl at the ground level in the city, which is mainly caused by the burning of polyvinyl chloride (PVC) in the garbage. GB is also an important source of PM<sub>2.5</sub>, contributing about 3–30% simulated PM<sub>2.5</sub> mass on average. More modeling work is needed to evaluate the GB contribution to hazardous air toxics, such as dioxin, which is found to be released at high level from PVC burning in laboratory experiments.

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