Project aguila: In situ measurements of Mexico City air pollution by a research aircraft |
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| Institution: | 1. Forecast Systems Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO 80303, U.S.A.;2. Procesos Energéticos Alternos y Química Ambiental, Instituto Mexicano del Petróleo, Mexico D.F., Mexico;3. National Systems and Research, Boulder, CO 80303, U.S.A.;4. Research Aviation Facility, National Center for Atmospheric Research, Boulder, CO 80307, U.S.A.;1. Student Research Committee, School of Health, Shiraz University of Medical Sciences, Shiraz, Iran;2. Research Center for Health Science, Institute of Health, Department of Occupational Health, School of Health, Shiraz University of Medical Sciences, Shiraz, Iran;3. Department of Occupational Health and Safety Engineering, Faculty of Health, Mashhad University of Medical Sciences, Mashhad, Iran;4. College of Health Sciences, Old Dominion University, Norfolk, VA, USA;5. Department of Environmental Health, School of Health, Shiraz University of Medical Sciences, Shiraz, Iran;1. School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, United States;2. School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, 30332, United States;3. School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, United States |
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| Abstract: | Measurements of aerosol concentrations, chemical species and meteorological quantities in the air above Mexico City were obtained from an instrumented research aircraft. Concentrations of particles in the size range between 0.12 and 3.12 μm were nearly invariant with height, and typical values were of the order of 5000 cm−3. However, particles smaller than 0.12 μm were confined to the lowest few hundred meters of the atmosphere until the morning temperature inversion dissipated, after which time those particles, together with newly formed particles created by secondary processes, mixed to a greater height above the city. Total particle concentrations near the surface attained values in excess of 60,000 cm−3. An examination of the corresponding profiles of SO2 suggests that combustion processes are likely sources for the additional small particles. |
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