Abstract
Ozone dynamics depend on meteorological characteristics such as wind, radiation, sunshine, air temperature and precipitation. The aim of this study was to determine ozone trajectories along the northern coast of Portugal during the summer months of 2005, when there was a spate of forest fires in the region, evaluating their impact on respiratory and cardiovascular health in the greater metropolitan area of Porto. We investigated the following diseases, as coded in the ninth revision of the International Classification of Diseases: hypertensive disease (codes 401–405); ischemic heart disease (codes 410–414); other cardiac diseases, including heart failure (codes 426–428); chronic obstructive pulmonary disease and allied conditions, including bronchitis and asthma (codes 490–496); and pneumoconiosis and other lung diseases due to external agents (codes 500–507). We evaluated ozone data from air quality monitoring stations in the study area, together with data collected through HYbrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) model analysis of air mass circulation and synoptic-scale zonal wind from National Centers for Environmental Prediction data. High ozone levels in rural areas were attributed to the dispersion of pollutants induced by local circulation, as well as by mesoscale and synoptic scale processes. The fires of 2005 increased the levels of pollutants resulting from the direct emission of gases and particles into the atmosphere, especially when there were incoming frontal systems. For the meteorological case studies analyzed, peaks in ozone concentration were positively associated with higher rates of hospital admissions for cardiovascular diseases, although there were no significant associations between ozone peaks and admissions for respiratory diseases.
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Acknowledgments
This paper was supported by the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, National Council for Scientific and Technological Development). We are especially grateful to Dr. Maciel Barbosa, ARS-president, who provided access to the hospital data. We also thank Jeff Boyles and Miguel Lopes for their significant contributions.
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Azevedo, J.M., Gonçalves, F.L.T. & de Fátima Andrade, M. Long-range ozone transport and its impact on respiratory and cardiovascular health in the north of Portugal. Int J Biometeorol 55, 187–202 (2011). https://doi.org/10.1007/s00484-010-0324-2
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DOI: https://doi.org/10.1007/s00484-010-0324-2