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. 2014 Jan 23;9(1):e86913.
doi: 10.1371/journal.pone.0086913. eCollection 2014.

Association between air pollution and general outpatient clinic consultations for upper respiratory tract infections in Hong Kong

Wilson W S Tam  1 , Tze Wai Wong  2 , Lorna Ng  3 , Samuel Y S Wong  2 , Kenny K L Kung  2 , Andromeda H S Wong  2
Affiliations

Association between air pollution and general outpatient clinic consultations for upper respiratory tract infections in Hong Kong

Wilson W S Tam et al. PLoS One. .

Abstract

Background and objectives: Many studies have shown the adverse effects of air pollution on respiratory health, but few have examined the effects of air pollution on service utilisation in the primary care setting. The aim of this study was to examine the association between air pollution and the daily number of consultations due to upper respiratory tract infections (URTIs) in general outpatient clinics (GOPCs) in Hong Kong.

Methods: Daily data on the numbers of consultations due to URTIs in GOPCs, the concentrations of major air pollutants, and the mean values of metrological variables were retrospectively collected over a 3-year period (2008-2010, inclusive). Generalised additive models were constructed to examine the association between air pollution and the daily number of consultations, and to derive the relative risks and 95% confidence intervals (95% CI) of GOPC consultations for a unit increase in the concentrations of air pollutants.

Results: The mean daily consultations due to URTIs in GOPCs ranged from 68.4 to 253.0 over the study period. The summary relative risks (and 95% CI) of daily consultations in all GOPCs for the air pollutants PM10, NO2, O3, and SO2 were 1.005 (1.002, 1.009), 1.010 (1.006, 1.013), 1.009 (1.006, 1.012), and 1.004 (1.000, 1.008) respectively, per 10 µg/m(3) increase in the concentration of each pollutant.

Conclusion: Significant associations were found between the daily number of consultations due to URTIs in GOPCs and the concentrations of air pollutants, implying that air pollution incurs a substantial morbidity and increases the burden of primary health care services.

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Conflict of interest statement

Competing Interests: The authors have declared that no competing interests exist.

Figures

Figure 1
Figure 1. A location map of GOPCs and the air monitoring stations.
See this image and copyright information in PMC

References

    1. Atkinson RW, Anderson HR, Sunyer J, Ayres J, Baccini M, et al. (2001) Acute effects of particulate air pollution on respiratory admissions: results from APHEA 2 project. Air Pollution and Health: a European Approach. Am J Respir Crit Care Med 164: 1860–1866. - PubMed
    1. Samet JM, Dominici F, Curriero FC, Coursac I, Zeger SL (2000) Fine particulate air pollution and mortality in 20 U.S. cities, 1987–1994. N Engl J Med 343: 1742–1749. - PubMed
    1. Katsouyanni K, Touloumi G, Spix C, Schwartz J, Balducci F, et al. (1997) Short-term effects of ambient sulphur dioxide and particulate matter on mortality in 12 European cities: results from time series data from the APHEA project. Air Pollution and Health: a European Approach. BMJ 314: 1658–1663. - PMC - PubMed
    1. Schwartz J (1999) Air pollution and hospital admissions for heart disease in eight U.S. counties. Epidemiology 10: 17–22. - PubMed
    1. Bremner SA, Anderson HR, Atkinson RW, McMichael AJ, Strachan DP, et al. (1999) Short-term associations between outdoor air pollution and mortality in London 1992–4. Occup Environ Med 56: 237–244. - PMC - PubMed