Chronic effects of ambient air pollution on respiratory morbidities among Chinese children: a cross-sectional study in Hong KongReportar como inadecuado

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BMC Public Health

, 14:105

Environmental health


BackgroundThe chronic health effects from exposure to ambient air pollution are still unclear. This study primarily aims to examine the relationship between long-term exposure to ambient air pollution and respiratory morbidities in Chinese children.

MethodsA cross-sectional study was conducted among 2,203 school children aged 8–10 in three districts with different air pollution levels in Hong Kong. Annual means for ambient PM10, SO2, NO2 and O3 in each district were used to estimate participants’ individual exposure. Two questionnaires were used to collect children’s respiratory morbidities and other potential risk factors. Multivariable logistic regression was fitted to estimate the risks of air pollution for respiratory morbidities.

ResultsCompared to those in the low-pollution district LPD, girls in the high-pollution district HPD were at significantly higher risk for cough at night ORadj. = 1.81, 95% CI: 1.71-2.78 and phlegm without colds ORadj. = 3.84, 95% CI: 1.74-8.47. In addition, marginal significance was reached for elevated risks for asthma, wheezing symptoms, and phlegm without colds among boys in HPD adjusted ORs: 1.71-2.82, as well as chronic cough among girls in HPD ORadj. = 2.03, 95% CI: 0.88-4.70.

ConclusionsResults have confirmed certain adverse effects on children’s respiratory health from long-term exposure to ambient air pollution. PM10 may be the most relevant pollutant with adverse effects on wheezing and phlegm in boys. Both PM10 and NO2 may be contributing to cough and phlegm in girls.

KeywordsAir pollution PM10 NO2 Child Respiratory morbidity China Urban Abbreviations95% CI95% confidence intervals

ATS-DLD-78-CChildren’s Questionnaire recommended by the American Thoracic Society

HKEPDEnvironmental Protection Department of Hong Kong

HPDHigh-pollution district

ISAACInternational Study of Asthma and Allergies in Childhood

ISAAC WQAsthma and Allergies in Childhood Written Questionnaire

LPDLow-pollution district

MPDModerate-pollution district

NO2Nitrogen dioxide

NOxNitrogen Oxides


OROdds ratio

PM10Particulate matters less than 10 μm in aerodynamic diameter

SDStandard deviation

SO2Sulphur dioxide.

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Autor: Yang Gao - Emily YY Chan - Liping Li - Patrick WC Lau - Tze Wai Wong


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