Abstract
During the MILAGRO campaign, March 2006, eight-stage cut impactors were used to sample atmospheric particles at Tecámac (T1 supersite), towards the northeast edge of the Mexico City Metropolitan Area, collecting fresh local emissions and aged pollutants produced in Mexico City. Particle samples were analyzed to determine total mass concentrations of Ca2+, Mg2+, NH4 +, K+, Cl−, SO4 2−, and NO3 −. Average concentrations were 22.1 ± 7.2 μg m−3 for PM10 and 18.3 ± 6.2 μg m−3 for PM1.8. A good correlation between PM10 and PM1.8, without influence from wind patterns, indicates that local emissions are more important than the city’s pollution transported to the site, despite the fact that Tecámac is just 40 km away from Mexico City. A lack of diurnal patterns in the PM2.5/PM1.8 ratio supports this conclusion. The inorganic composition of particles suggests that vehicles, soil resuspension, and industries are the main pollutant sources. Finally, the particles were found to be neutralized, in agreement with observations in the Mexico City Metropolitan Area.
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Acknowledgements
Authors thank MILAGRO leaders for their inclusion into the project; Universidad de Tecámac for the facilities during the campaign; Centro de Ciencias de la Atmósfera staff for their help during the measurements.
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Castro, T., Peralta, O., Salcedo, D. et al. Water-soluble inorganic ions of size-differentiated atmospheric particles from a suburban site of Mexico City. J Atmos Chem 75, 155–169 (2018). https://doi.org/10.1007/s10874-017-9369-5
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DOI: https://doi.org/10.1007/s10874-017-9369-5