OZONE LEVELS ASSOCIATED TO THE PHOTOCHEMICAL SMOG IN SANTIAGO OF CHILE: THE ELUSIVE ROL OF HYDROCARBONS

Santiago of Chile presents, in autumn and summer, high levels of oxidants and, in particular of ozone. Peculiar features of this phenomenon are a strong dependence of the contamination with the daily maxima temperature and a weekend effect, comprising relatively high ozone levels in spite of reduced...

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Autores principales:	RUBIO,MARIA A, SÁNCHEZ,KAREN, LISSI,E
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2011
Materias:	Ozone Santiago of Chile VOCs/NOx ratio weekend effect
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072011000200019
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id	oai:scielo:S0717-97072011000200019
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spelling	oai:scielo:S0717-970720110002000192011-09-01OZONE LEVELS ASSOCIATED TO THE PHOTOCHEMICAL SMOG IN SANTIAGO OF CHILE: THE ELUSIVE ROL OF HYDROCARBONSRUBIO,MARIA ASÁNCHEZ,KARENLISSI,E Ozone Santiago of Chile VOCs/NOx ratio weekend effect Santiago of Chile presents, in autumn and summer, high levels of oxidants and, in particular of ozone. Peculiar features of this phenomenon are a strong dependence of the contamination with the daily maxima temperature and a weekend effect, comprising relatively high ozone levels in spite of reduced emissions of its precursors. A common explanation of these effects could be an increase in the VOCs/NOx ratio. In order to test this possibility we perform la multiparametric analysis of Santiago's historical data. This data treatment corroborates a robust dependence of maxima ozone levels with temperature and a moderate weekend effect. In fact, ozone levels in weekend days are similar to those of working days, in spite of significantly reduced primary emissions (29 % of NOx and 20 % of CO). However, no increase in VOCs/NOx ratios, measured at the early morning rush out hours, is observed in high temperature days. On the other hand, the data suggest a moderate increase of the VOCs/NOx ratio in week ends. This would indicate that other factors beyond a simple increase in VOCs levels contribute to the above mentioned peculiarities of oxidant levels in the urban atmosphere of Santiago.info:eu-repo/semantics/openAccessSociedad Chilena de QuímicaJournal of the Chilean Chemical Society v.56 n.2 20112011-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072011000200019en10.4067/S0717-97072011000200019
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Ozone Santiago of Chile VOCs/NOx ratio weekend effect
spellingShingle	Ozone Santiago of Chile VOCs/NOx ratio weekend effect RUBIO,MARIA A SÁNCHEZ,KAREN LISSI,E OZONE LEVELS ASSOCIATED TO THE PHOTOCHEMICAL SMOG IN SANTIAGO OF CHILE: THE ELUSIVE ROL OF HYDROCARBONS
description	Santiago of Chile presents, in autumn and summer, high levels of oxidants and, in particular of ozone. Peculiar features of this phenomenon are a strong dependence of the contamination with the daily maxima temperature and a weekend effect, comprising relatively high ozone levels in spite of reduced emissions of its precursors. A common explanation of these effects could be an increase in the VOCs/NOx ratio. In order to test this possibility we perform la multiparametric analysis of Santiago's historical data. This data treatment corroborates a robust dependence of maxima ozone levels with temperature and a moderate weekend effect. In fact, ozone levels in weekend days are similar to those of working days, in spite of significantly reduced primary emissions (29 % of NOx and 20 % of CO). However, no increase in VOCs/NOx ratios, measured at the early morning rush out hours, is observed in high temperature days. On the other hand, the data suggest a moderate increase of the VOCs/NOx ratio in week ends. This would indicate that other factors beyond a simple increase in VOCs levels contribute to the above mentioned peculiarities of oxidant levels in the urban atmosphere of Santiago.
author	RUBIO,MARIA A SÁNCHEZ,KAREN LISSI,E
author_facet	RUBIO,MARIA A SÁNCHEZ,KAREN LISSI,E
author_sort	RUBIO,MARIA A
title	OZONE LEVELS ASSOCIATED TO THE PHOTOCHEMICAL SMOG IN SANTIAGO OF CHILE: THE ELUSIVE ROL OF HYDROCARBONS
title_short	OZONE LEVELS ASSOCIATED TO THE PHOTOCHEMICAL SMOG IN SANTIAGO OF CHILE: THE ELUSIVE ROL OF HYDROCARBONS
title_full	OZONE LEVELS ASSOCIATED TO THE PHOTOCHEMICAL SMOG IN SANTIAGO OF CHILE: THE ELUSIVE ROL OF HYDROCARBONS
title_fullStr	OZONE LEVELS ASSOCIATED TO THE PHOTOCHEMICAL SMOG IN SANTIAGO OF CHILE: THE ELUSIVE ROL OF HYDROCARBONS
title_full_unstemmed	OZONE LEVELS ASSOCIATED TO THE PHOTOCHEMICAL SMOG IN SANTIAGO OF CHILE: THE ELUSIVE ROL OF HYDROCARBONS
title_sort	ozone levels associated to the photochemical smog in santiago of chile: the elusive rol of hydrocarbons
publisher	Sociedad Chilena de Química
publishDate	2011
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072011000200019
work_keys_str_mv	AT rubiomariaa ozonelevelsassociatedtothephotochemicalsmoginsantiagoofchiletheelusiverolofhydrocarbons AT sanchezkaren ozonelevelsassociatedtothephotochemicalsmoginsantiagoofchiletheelusiverolofhydrocarbons AT lissie ozonelevelsassociatedtothephotochemicalsmoginsantiagoofchiletheelusiverolofhydrocarbons
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OZONE LEVELS ASSOCIATED TO THE PHOTOCHEMICAL SMOG IN SANTIAGO OF CHILE: THE ELUSIVE ROL OF HYDROCARBONS

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