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Journal of the Mexican Chemical Society

versión impresa ISSN 1870-249X


JAIMES-LOPEZ, José Luis; SANDOVAL-FERNANDEZ, Julio  y  ZAMBRANO-GARCIA, Angel. Exploring the Liquefied Petroleum Gas - Ozone Relation in Guadalajara, Mexico, by Smog Chamber Experiments. J. Mex. Chem. Soc [online]. 2005, vol.49, n.3, pp.292-297. ISSN 1870-249X.

It has been hypothesized that liquefied petroleum gas (LPG) emissions can increase substantially the formation of ozone (O3) in the ambient air. We tested experimentally such hypothesis in Guadalajara's downtown by captive-air irradiation (CAI) techniques. During November 1997-January, 1998, morning ambient air samples were confined in outdoor smog chambers and subjected to the following treatments: 35% addition of commercial LPG or one out of two mixtures of major LPG compounds (propane/butane: 70/30% or 60/40%), 50% dilution of total volatile hydrocarbons (VOCs), and 50% dilution of LPG associated VOCs (C2-C4). Captive and untreated morning ambient air served as experimental control. This experiment ran under ambient sunlight and temperature. Chamber O3 was measured hourly from 08:00-18:00h, and the maximum O3 concentration (O3max) was used for treatment comparisons. Daily O3 profiles within the control chambers and in open ambient air were fairly similar, though O3max was consistently higher in the chambers. Only the 50% dilution of total volatile hydrocarbons (VOCs) had a significant effect on O3max, which decreased by 16% on average. These results indicate that high O3 levels in Guadalajara can not be explained by LPG emissions. A supplementary experiment with captive clean air added with commercial LPG or the same propane/butane mixtures showed that O3 formation was less favoured by the 70/30% mixture.

Palabras llave : Smog chamber experiments; ozone; air quality and liquefied petroleum gas.

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