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- Title
Assessment of personal exposure to ozone in asthmatic children residing in Mexico City.
- Authors
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
- Abstract
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 children 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 children's 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.
- Subjects
MEXICO City (Mexico); MEXICO; OZONE; MEASUREMENT; ASTHMATICS; ASTHMA in children
- Publication
Salud Pública de México, 2008, Vol 50, Issue 1, p67
- ISSN
0036-3634
- Publication type
Article