[Time-series analysis on the association between gaseous air pollutants and daily mortality in urban residents in Tianjin].

OBJECTIVE

To study the association between sulphur dioxide, nitrogen dioxide and daily mortality in urban population from Tianjin.

METHODS

Data on daily concentration of inhalable particulate matter, sulphur dioxide and nitrogen dioxide, daily mean temperature and relative humidity, daily cause-specific death counts were collected. Generalized additive models was used to explore the relationship between sulphur dioxide, nitrogen dioxide and daily mortality, after adjusting the effects of long-term and seasonal trend, weather conditions, and to analyze the potential effect of particulate matter and model parameters on relative risk estimates.

RESULTS

Results showed that the daily concentrations of SO(2) and NO(2) were significantly associated with daily non-accidental and cardiovascular mortality but not associated with daily respiratory mortality. An increase of 10 µg/m(3) in SO(2) was associated with 0.56% (95%CI: 0.23% - 0.89%) non-accidental morality, 0.49% (0.06% - 0.93%) cardiovascular morality, respectively. An increase of 10 µg/m(3) in NO(2) was associated with 0.94% (95%CI: 0.17% - 1.70%) non-accidental morality, 1.29% (0.29% - 2.30%) cardiovascular morality, respectively.

CONCLUSION

Our findings suggested that exposure to SO(2) and NO(2) was significantly associated with daily cardiovascular and respiratory mortality in urban population in Tianjin.