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Air pollution and school absenteeism among children in Mexico City
I Romieu1, M C Lugo, S R Velasco
1Pan American Health Organization, Mexico City, Mexico.
Insights
High ozone exposure increases children's risk of respiratory illness. Combined with low temperatures, this risk significantly rises, suggesting an interactive effect on child respiratory health.
Area of Science:
- Environmental Health
- Pediatric Respiratory Medicine
- Epidemiology
Background:
- Ozone is a major air pollutant with known respiratory effects.
- Preschool children may be particularly vulnerable to air pollution impacts.
- Mexico City experiences high levels of ozone pollution.
Purpose of the Study:
- To investigate the acute effects of ozone exposure on respiratory illness in preschool children.
- To determine the association between ozone levels and respiratory-related school absenteeism.
- To explore potential interactive effects of ozone and temperature on respiratory health.
Main Methods:
- A 3-month follow-up study of 111 preschool children in Mexico City.
- Data collection via parental questionnaires on demographics, medical history, and indoor pollution.
- Logistic regression analysis for longitudinal data to assess ozone-respiratory illness relationships.
Main Results:
- 50% of children experienced at least one respiratory-related absence.
- Exposure to high ozone levels (> 0.13 ppm) for 2 days increased respiratory illness risk by 20%.
- Combined exposure to high ozone and low temperature (< 5.1°C) increased risk by 40% (OR=1.44).
Conclusions:
- Ozone exposure is positively associated with increased risk of respiratory illness in children.
- A significant interactive effect exists between high ozone and low temperature exposure.
- Findings highlight the need for air quality interventions to protect child respiratory health.
Abstract:
To determine the acute effects of ozone exposure, the authors conducted a short follow-up study of respiratory illness in a population of 111 preschool children frequently exposed to ozone levels that regularly exceed 0.120 parts per million (ppm). The children attended a private kindergarten in the southwestern part of Mexico City. Parents completed a questionnaire on demographic data, medical history, and potential sources of indoor air pollution. To determine the relation of ozone and respiratory-related school absenteeism, the authors used a logistic regression model for longitudinal data. During the 3-month follow-up, 50% of the children had at least one respiratory-related absenteeism period, and 11.7% had two or more. Children exposed for 2 consecutive days to high ozone levels (> or = 0.13 ppm) had a 20% increment in the risk of respiratory illness. For children exposed for 2 consecutive days to a high ozone level and the previous day to low temperature (< or = 5.1 degrees C), the risk reached 40% (odds ratio = 1.44, 95% confidence interval 1.37-1.52). This study suggests that ozone exposure might be positively associated with the risk of respiratory illness in children and that it may have an interactive effect with low temperature exposure.