Air pollution-related peak expiratory flow rates among asthmatic children in Chiang Mai, Thailand

Abstract

The severity of air pollution in northern Thailand has long been recognized; in spite of that there have been no epidemiological studies regarding the associations between the air pollution and health effects in the area. The authors followed a cohort of 31 asthmatic children (4–11 years of age) residing in Muang district, Chiang Mai, Thailand, from 29 August 2005 to 30 June 2006, for 306 days. The daily air pollutants, including particulate matter with aerodynamic diameter < 2.5 μm, particulate matter with aerodynamic diameter < 10 μm, carbon monoxide, ozone (O₃), nitrogen dioxide, and sulfur dioxide (SO₂), and the meteorological parameters, including pressure, temperature, relative humidity, rain quantity, and sunshine duration, were recorded. The peak expiratory flow rates (PEFRs) were fitted with pollutants and meteorological covariates using general linear mixed models to account for random effects and autocorrelation. The authors found that there were inverse associations of SO₂ and evening PEFR, with a coefficient of -2.12 (95% confidence interval (CI) = -3.22 to -0.28); of SO₂ and daily percent deviation of PEFR, with a coefficient of -0.73 (95% CI = -1.33 to -0.12); and of O₃ combining with SO₂ and daily average PEFR, with a coefficient of -0.16 (95% CI = -0.31 to -0.00) and -1.60 (95% CI = -3.10 to -0.11), respectively. The associations of O₃ and SO₂ with PEFR were found even when SO₂ concentrations never exceeded the standard level.

Keywords::

• Air pollution
• asthmatic children
• ozone
• peak expiratory flow rate
• sulfur dioxide

Acknowledgements

We would like to sincerely thank all asthmatic children for their persevering continuity in the project participation without any complaint.

Declaration of interest

This study was funded by the Thailand Research Fund. Special thanks are due to the Pollution Control Department, Ministry of National Resources and Environment, for the air quality data, and to the Northern Meteorology Center for the meteorological data. All authors declare that they have neither potential competing financial interest, nor conflict of interest.