Assessment of personal exposure to ozone in asthmatic children residing in Mexico City

Matiana Ramírez-Aguilar, Albino Barraza-Villarreal, Hortensia Moreno-Macías, Arthur M Winer, Pablo Cicero-Fernández, Ma. Guadalupe Doris Vélez-Márquez, Marlene Cortez-Lugo, Juan José Sienra-Monge, Isabelle Romieu
2008 Salud Pública de México  
Assessment of personal exposure to ozone in asthmatic children residing in Mexico City. Salud Publica Mex 2008;50:67-75. Abstract Objective. A study was conducted to evaluate personal ozone exposure (O 3p ) among asthmatic children residing in Mexico City. Material and Methods. A total of 158 children were recruited from December 1998 to April 2000. On average, three O 3p measurements were obtained per child using passive badges. Time-activity patterns were recorded in a diary. Daily ambient
more » ... y. Daily ambient ozone measurements (O 3a ) were obtained from the fixed station, according to children's residence. Levels of O 3a and ozone, weighted by time spent in different micro-environments (O 3w ), were used as independent variables in order to model O 3p concentrations using a mixed-effects model. Results. Mean O 3p 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 R 2 =0.50, p<0.05). Conclusions. The O 3w concentrations can be used as a proxy for O 3p , taking into account time-activity patterns and the place of residence of asthmatic Mexican children. Cortez-Lugo M, Sienra-Monge JJ, Romieu I. Evaluación de la exposición personal a Ozono en niños asmáticos de la Ciudad de México. Salud Publica Mex 2008;50:67-75.
doi:10.1590/s0036-36342008000100013 fatcat:yz3m25mo5nhftno7n2y22gu6hi