Assessment of personal exposure to ozone in asthmatic children residing in Mexico City
OBJECTIVE: A study was conducted to evaluate personal ozone exposure (O3p) among asthmatic children residing in Mexico City. MATERIAL AND METHODS: A total of 158 chil-dren were recruited from December 1998 to April 2000. On average, three O3p measurements were obtained per child using passive badges. Time-activity patterns were recorded in a diary. Daily ambient ozone measurements (O3a) were obtained from the fixed station, according to childrens residence. Levels of O3a and ozone, weighted by time spent in different micro-environments (O3w), were used as independent variables in order to model O3p concentrations using a mixed-effects model. RESULTS: Mean O3p was 7.8 ppb. The main variables in the model were: time spent indoors, distance between residence and fixed station, follow-up group, and two interaction terms (overall R²=0.50, p<0.05). CONCLUSIONS: The O3w concentrations can be used as a proxy for O3p, taking into account time-activity patterns and the place of residence of asthmatic Mexican children.
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Instituto Nacional de Salud Pública
2008
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oai:scielo:S0036-363420080001000132009-08-21Assessment of personal exposure to ozone in asthmatic children residing in Mexico CityRamírez-Aguilar,MatianaBarraza-Villarreal,AlbinoMoreno-Macías,HortensiaWiner,Arthur MCicero-Fernández,PabloVélez-Márquez,Ma. Guadalupe DorisCortez-Lugo,MarleneSienra-Monge,Juan JoséRomieu,Isabelle personal measurements ozone asthmatics Mexico City activity patterns OBJECTIVE: A study was conducted to evaluate personal ozone exposure (O3p) among asthmatic children residing in Mexico City. MATERIAL AND METHODS: A total of 158 chil-dren were recruited from December 1998 to April 2000. On average, three O3p measurements were obtained per child using passive badges. Time-activity patterns were recorded in a diary. Daily ambient ozone measurements (O3a) were obtained from the fixed station, according to childrens residence. Levels of O3a and ozone, weighted by time spent in different micro-environments (O3w), were used as independent variables in order to model O3p concentrations using a mixed-effects model. RESULTS: Mean O3p was 7.8 ppb. The main variables in the model were: time spent indoors, distance between residence and fixed station, follow-up group, and two interaction terms (overall R²=0.50, p<0.05). CONCLUSIONS: The O3w concentrations can be used as a proxy for O3p, taking into account time-activity patterns and the place of residence of asthmatic Mexican children.info:eu-repo/semantics/openAccessInstituto Nacional de Salud PúblicaSalud Pública de México v.50 n.1 20082008-02-01info:eu-repo/semantics/articletext/htmlhttp://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S0036-36342008000100013en |
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México |
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Ramírez-Aguilar,Matiana Barraza-Villarreal,Albino Moreno-Macías,Hortensia Winer,Arthur M Cicero-Fernández,Pablo Vélez-Márquez,Ma. Guadalupe Doris Cortez-Lugo,Marlene Sienra-Monge,Juan José Romieu,Isabelle |
spellingShingle |
Ramírez-Aguilar,Matiana Barraza-Villarreal,Albino Moreno-Macías,Hortensia Winer,Arthur M Cicero-Fernández,Pablo Vélez-Márquez,Ma. Guadalupe Doris Cortez-Lugo,Marlene Sienra-Monge,Juan José Romieu,Isabelle Assessment of personal exposure to ozone in asthmatic children residing in Mexico City |
author_facet |
Ramírez-Aguilar,Matiana Barraza-Villarreal,Albino Moreno-Macías,Hortensia Winer,Arthur M Cicero-Fernández,Pablo Vélez-Márquez,Ma. Guadalupe Doris Cortez-Lugo,Marlene Sienra-Monge,Juan José Romieu,Isabelle |
author_sort |
Ramírez-Aguilar,Matiana |
title |
Assessment of personal exposure to ozone in asthmatic children residing in Mexico City |
title_short |
Assessment of personal exposure to ozone in asthmatic children residing in Mexico City |
title_full |
Assessment of personal exposure to ozone in asthmatic children residing in Mexico City |
title_fullStr |
Assessment of personal exposure to ozone in asthmatic children residing in Mexico City |
title_full_unstemmed |
Assessment of personal exposure to ozone in asthmatic children residing in Mexico City |
title_sort |
assessment of personal exposure to ozone in asthmatic children residing in mexico city |
description |
OBJECTIVE: A study was conducted to evaluate personal ozone exposure (O3p) among asthmatic children residing in Mexico City. MATERIAL AND METHODS: A total of 158 chil-dren were recruited from December 1998 to April 2000. On average, three O3p measurements were obtained per child using passive badges. Time-activity patterns were recorded in a diary. Daily ambient ozone measurements (O3a) were obtained from the fixed station, according to childrens residence. Levels of O3a and ozone, weighted by time spent in different micro-environments (O3w), were used as independent variables in order to model O3p concentrations using a mixed-effects model. RESULTS: Mean O3p was 7.8 ppb. The main variables in the model were: time spent indoors, distance between residence and fixed station, follow-up group, and two interaction terms (overall R²=0.50, p<0.05). CONCLUSIONS: The O3w concentrations can be used as a proxy for O3p, taking into account time-activity patterns and the place of residence of asthmatic Mexican children. |
publisher |
Instituto Nacional de Salud Pública |
publishDate |
2008 |
url |
http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S0036-36342008000100013 |
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