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Chemosphere

Title:		Ozone precursors and boundary layer meteorology before and during a severe ozone episode in Mexico city
Author(s):		Akther T; Rappenglueck B; Osibanjo O; Retama A; Rivera-Hernandez O;
Address:		"Earth and Atmospheric Sciences, University of Houston, Houston, TX, USA. Electronic address: takther@cougarnet.uh.edu. Earth and Atmospheric Sciences, University of Houston, Houston, TX, USA. Independent Researcher, Mexico City, Mexico. Direccion de Monitoreo de Calidad del Aire, Secretaria del Medio Ambiente, Ciudad de Mexico, Mexico"
Journal Title:		Chemosphere
Year:		2023
Volume:		20230128
Issue:
Page Number:		137978 -
DOI:		10.1016/j.chemosphere.2023.137978
ISSN/ISBN:		1879-1298 (Electronic) 0045-6535 (Linking)
Abstract:		"Volatile organic compounds (VOCs) data in conjunction with other inorganic pollutants, surface meteorological data and continuous measurement of the Planetary Boundary Layer height (PBLH) at an urban site in Mexico City were performed from 6 to 18 March 2016. Positive Matrix Factorization (PMF) identified four emission source factors of VOCs along with equivalent black carbon (eBC), gaseous pollutants (CO, NO, NO(2), SO(2), NH(3)) and ions (Na(+), Mg(2+), Ca(2+), NO(3)(-), NH(4)(+)): (1) secondary aerosol precursors, (2) evaporation and non-LPG fuel combustion, (3) geogenic source and (4) vehicle exhaust. Propylene Equivalent and Maximum Incremental Reactivity (MIR) methods identified isoprene and ethylene as the highest oxidant and O(3) forming species. Pollutant data normalized to the variation of the PBLH revealed continued production of O(3) precursors in the afternoon beyond the typical morning rush hour. In particular this could be observed during the second part of the measurement period (12-15 March) when a strong O(3) episode occurred under weak wind and lower PBLH conditions compared to the preceding period (6-11 March) when well mixed conditions due to elevated daytime PBLH and strong advection led to overall reduced pollutant mixing ratios in the afternoon hours"
Keywords:		*Ozone/analysis *Air Pollutants/analysis Meteorology Mexico Environmental Monitoring/methods Vehicle Emissions/analysis *Volatile Organic Compounds/analysis China Maximum incremental reactivity Mexico City Planetary boundary layer Positive matrix factoriz;
Notes:		"MedlineAkther, Tanzina Rappenglueck, Bernhard Osibanjo, Olabosipo Retama, Armando Rivera-Hernandez, Olivia eng England 2023/02/01 Chemosphere. 2023 Mar; 318:137978. doi: 10.1016/j.chemosphere.2023.137978. Epub 2023 Jan 28"