10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
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PM1 Chemical Characterization in 2015, South of Mexico City, with an Aerosol Chemical Speciation Monitor
DARA SALCEDO, Harry Alvarez-Ospina, Oscar Peralta, Telma Castro, National University of Mexico
Abstract Number: 1401 Working Group: Air Quality in Megacities: from Sources to Control
Abstract The Mexico City Metropolitan Area (MCMA) is the largest megacity in North America with over 20 million people in 1500 km2. Historically, the MCMA has suffered of bad air quality by ozone and particulate matter (PM), causing severe health effects on its population. However, very few studies regarding the chemical composition of particles have been done. The last large one was held during the MILAGRO campaign in 2006 (Molina, et. al., 2010. Atmos. Chem. Phys., 10, 8697–8760) which included several sites north of Mexico City. A more recent study published in 2017 (Guerrero, et al., 2017. Atmosfera, 30, 243-273) discussed how has the chemical composition of PM in the north of the MCMA changed from 2006 to 2014. In this presentation, we will describe the chemical composition of PM1 in a site south of Mexico City using an Aerodyne Aerosol Chemical Speciation Monitor (ACSM) from January 19 to March 19, 2015. The organic fraction of PM1 was analyzed using the Positive Matrix Factorization (PMF) model in order to deconvolve it into distinct factors of different origin. The ACSM data will be compared with criteria air pollutants and black carbon concentrations, as well as meteorology parameters. Differences between the chemical composition of particles in the north and south of the city will be discussed in relation to the PM sources found in each site.