Time-series Analysis of Association Between Gaseous Air Pollutants and Daily Mortality in Urban Residents in Tianjin

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PP-30-034 Background/Aims: Numerous epidemiological studies have reported the association between ambient pollutants in North American, European, and Asian cities. However, few studies explored the effects of air pollutants on daily mortality in Tianjin city. The aim is to study the association between sulfur dioxide and nitrogen dioxide and daily mortality in urban population in Tianjin. Methods: We collected daily concentration of inhalable particulate matter, sulfur dioxide and nitrogen dioxide, daily mean temperature and relative humidity, and daily cause-specific death counts. We used generalized additive models to explore the relationship between sulfur dioxide and nitrogen dioxide and daily mortality, after adjusting the effects of long-term and seasonal trend, and weather conditions, and analyzed the potential effect of particulate matter and model parameters on relative risk estimates. Results: Daily concentrations of SO2 and NO2 were significantly associated with daily nonaccidental and cardiovascular mortality, and not associated with daily respiratory mortality. An increase of 10 μg/m3 in SO2 was associated with 0.56% (95% CI: 0.23%–0.89%) nonaccidental morality and 0.49% (0.06%–0.93%) cardiovascular morality. An increase of 10 μg/m3 in NO2 was associated with 0.94% (95% CI: 0.17%–1.70%) nonaccidental morality and 1.29% (0.29%–2.30%) cardiovascular morality. Conclusion: The findings suggest that exposure to SO2 and NO2 was significantly associated with daily cardiovascular and respiratory mortality in urban population in Tianjin.