Abstract
This study analyzes ozone formation in the metropolitan area of Lima-Callao as a function of meteorological patterns and the concentrations of nitrogen oxides and reactive organic gases. The study area is located on the west coast of South America (12°S) in an upwelling region that is markedly affected by the Southeast Pacific anticyclone. The vertical stability and diurnal evolution of the mixing layer were analyzed from radiosondes launched daily during 1992–2014 and from two intensive campaigns in 2009. Vertical profiles show that during June–November, the subsidence inversion base ranges from 0.6 to 0.9 km above sea level (asl). In contrast, during December–May, subsidence inversion dissipates, leading to weak surface inversions from 0.1 to 0.6 km asl. At the surface level, compliance with the ozone standard of 51 parts per billion by volume (ppbv) is explained by the marine boundary layer effect and by strong inhibition of ozone formation due to titration with nitric oxide. Day-of-the-week variations in ozone and nitrogen oxides suggest a VOC-limited ozone-formation regime in the atmosphere of Lima. Furthermore, the pattern of C6–C12 species indicates that gasoline-powered vehicles are the main source of volatile organic compounds (VOCs), whereas the species with the greatest ozone-forming potential corresponded to the sum of the isomers m- and p-xylene. Mean benzene concentrations exceeded the standard of 0.63 ppbv, reaching 1.2 ppbv east of Lima. Nevertheless, the cancer risk associated with the inhalation of benzene was deemed acceptable, according to USEPA and WHO criteria.
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Acknowledgements
Rodrigo Seguel acknowledges support from CONICYT, FONDECYT Program, initiation into research 2013, Project No 11130177.
Funding
This work has been funded by the SNIP project: expansion and improvement of the monitoring network for air quality forecasting in Metropolitan Lima (N°199842).
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Silva, J.S., Rojas, J.P., Norabuena, M. et al. Ozone and volatile organic compounds in the metropolitan area of Lima-Callao, Peru. Air Qual Atmos Health 11, 993–1008 (2018). https://doi.org/10.1007/s11869-018-0604-2
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DOI: https://doi.org/10.1007/s11869-018-0604-2