American Journal of Epidemiology Vol. 141, No. 6: 546-553
Copyright © 1995 by The Johns Hopkins University School of Hygiene and Public Health
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Effects of Urban Air Pollutants on Emergency Visits for Childhood Asthma in Mexico City
1Centro Panamericano de Ecologia Humana y Salud, Organizacion Panamericana de la Salud Mexico City, Mexico
2Direction General de Epidemiologia Mexico City, Mexico
3Hospital Infantil de México Federico Gomez Mexico City, Mexico
4Instituto Nacional de Pediatria Mexico City, Mexico
5Instituto de Investigaciones en Matematicas Aplicadas y Sistemas (IIMAS) Mexico City, Mexico
6Instituto Nacional de Salud Publica, Centro de investigaciones en Salud Publica Cuemavaca, Morelos, Mexico
7Air Pollution and Respiratory Health Branch, Division of Environmental Hazards and Health Effects, National Center for Environmental Health, Centers for Disease Control and Prevention Atlanta, GA
Reprint requests to Dr. Mauricio Hemandez, Instituto Nacional de Salud Publica, Av. Universidad 655, Col Sta Maria Ahuacatitlan, Cuernavaca, Morelos, Mexico
The metropolitan area of Mexico City, Mexico, has serious air pollution problems. Although air contaminants may contribute to clinical asthma, there are at present no data on the relation between air pollution exposure and childhood asthma in Mexico City. The authors reviewed data on emergency visits from January to June 1990 at one major pediatric hospital in Mexico City. They used a Poisson regression model to study the relation between the number of daily emergency visits for asthma and air pollutant levels. The levels of ozone and sulfur dioxide exposure were significantly associated with the number of emergency visits for asthma. After adjustment for potential confounding factors, the multivariate regression model predicted that an increase of 50 ppb In the 1-hour maximum ozone level would lead to a 43% increase in the number of emergency visits for asthma on the following day. Exposure to high ozone levels (>110 ppb) for 2 consecutive days increased the number of asthma-related emergency visits by 68 percent. The results of this study suggest that ozone exposure is positively associated with the number of children's emergency visits for asthma in Mexico City. Am J Epidemiol 1995;141:54653.
air pollution; asthma; child; emergencies
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