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M. A. Parra, D. Elustondo, R. Bermejo and J. M. Santamaría, “Ambient Air Levels of Volatile Organic Compounds (VOC) and Nitrogen Dioxide (NO2) in a Medium Size City in Northern Spain,” The Science of the Total Environment, Vol. 407, No. 3, 2009, pp. 999-1009. doi:10.1016/j.scitotenv.2008.10.032

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• TITLE: Diurnal and Seasonal Variation of BTX in Ambient air of One Urban Site in Carmen City, Campeche, Mexico

  AUTHORS: J. G. Cerón, E. Ramírez, R. M. Cerón, C. Carballo, C. Aguilar, U. López, A. Ramírez, Y. Gracia, D. Naal, A. Campero, J. Guerra, E. Guevara

  KEYWORDS: BTX; Carbonyls; Volatile Organic Compounds; Air Pollution; Carmen City; Mexico

  JOURNAL NAME: Journal of Environmental Protection, Vol.4 No.8A, August 12, 2013

  ABSTRACT: BTX (benzene, ethylbenzene, toluene and p-xylene) and meteorological parameters were measured in ambient air of an urban site located in Carmen City, Campeche, Mexico. A total of 412 samples were collected for BTX and analyzed by Gas Chromatography with Flame Ionization Detection (GC-FID). Meteorological parameters were measured by a portable station. A marked diurnal variation was found for all measured BTX. The highest concentrations occurred during midday (13:00-14:30 h). A clear seasonal pattern was observed too for all compounds registering their highest levels during summer sampling period. Mean concentrations for benzene, ethylbenzene, toluene and p-xylene were: 5.42, 3.97, 11.24 and 8.32 ppbv, respectively. BTX abundance showed the following order: toluene > p-xylene > benzene > ethylbenzene. BTX maximum concentrations were found when winds blowed from E and NE. Important oil industry sources and avenues are located at these directions. These sources could contribute to the levels of BTX in this site.