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[Distribution characteristics of atmospheric pollutants and their effects on human health in Lanzhou City].

OBJECTIVE
To evaluate the distribution characteristics of atmospheric pollutants in Lanzhou City and their health-effects on daily respiratory disease hospital admissions.


METHODS
Using the same period atmospheric pollutants (PM10, SO2 and NO2) data, meteorological data and daily respiratory disease hospital admissions data, from 2001 to 2009 in Lanzhou, to analysis of the distribution of three air pollutants(PM10, SO2 and NO2), and their correlation with meteorological factors. On this basis, a time series semi-parametric generalized additive model (GAM) was used to analyze the exposure-effect relationship between air pollution and daily respiratory disease hospital admissions.


RESULTS
The concentrations of PM10 and SO2 showed a decreased trends during the study period of 9 years, and NO2 showed weakly fluctuations and remained substantially unchanged. The highest concentrations of the three pollutants were presented in the winter and the lowest value were presented in the summer. PM10 concentration monthly distribution was bimodal distribution, SO2 and NO2 were unimodal distribution. There were significantly correlation between meteorological factors and pollutants. The results showed that there was certain lag effect of three kinds of air pollutants on daily respiratory disease hospital admissions. The lag time of three air pollutants all were 0 - 6 day moving average (avg06). An increase of 10 µg/m in PM10, SO2 and NO2 were significantly associated with the excess risk (ER) of 0. 45%, 1. 35% and 3. 02% for all respiratory hospital admissions.


CONCLUSION
The ambient NO2, SO2 and PM10 concentrations have an adverse effect on daily hospital admissions for respiratory diseases of residents in Lanzhou City.