TAILIEUCHUNG - Air Pollution Mix and Emergency Room Visits for Respiratory and Cardiac Diseases in Taipei

Because of the topographic setting of the city, the moderately strong insolation associated with its tropical latitude and high elevation, and weak prevailing synoptic winds, Mexico City is strongly affected by thermally and topographically induced circulation patterns. Three daytime flow patterns were observed during February and much of (1) a regional plain-to-plateau flow of air from the lower lying areas to the north and east into the basin from the north in the late afternoon, driven by the heating of the elevated terrain in central Mexico; (2) local valley-to-basin flow in which southerly winds would develop and propagate through the gap in the mountains to. | Journal of Data Science 2 2004 311-327 Air Pollution Mix and Emergency Room Visits for Respiratory and Cardiac Diseases in Taipei Jing-Shiang Hwang1 Tsuey-Hwa Hu1 and Chang-Chuan Chan2 1 Academia Sinica 2 National Taiwan University Abstract To clarify the contribution of ambient air pollutants to acute health effects we examined the association between daily air pollution levels and emergency room ER visits for respiratory and cardiac diseases in Taipei City Taiwan from January 1997 to December 1998. Average daily concentrations of particulate matter less than ym in aerodynamic diameter PM10 carbon monoxide sulfur dioxide nitrogen dioxide and ozone were obtained from ambient air quality monitoring stations. The daily counts of ER visits stratified by diagnosis and age were modeled by both single-pollutant and multi-pollutant Poisson regression models with adjustment of confounding factors to evaluate the effects of individual pollutants. A mixture model was constructed by adding ratios of the pollutants to the multi-pollutant model to examine the air pollution mixture on ER visits. The single-pollutant models showed that an interquartile range change of 16 yg m3 was associated with increased ER visits for respiratory disease in all age groups with relative risks to and increased ER visits for cardiac disease in adult and elderly age groups with a relative risk of . Gaseous pollutants mainly NO2 and CO were also associated with increased visits by children for respiratory disease and visits by adults and elderly individuals for cardiac disease. Examination of joint effect of mixes of and gaseous pollutants showed that an interquartile range increase was associated with increases in ER visits by children for respiratory disease and by adults for cardiac disease with a relative risk of . Key words Air pollution cardiac disease emergency room visits respiratory disease. 312 . Hwang . Hu and . Chan 1. Introduction .

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