Association of Ambient Air Pollution with Respiratory Hospitalization: A case study

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In order to evaluate the effects of acute air pollution exposures on the health of respiratory system, espiratory
hospital admissions data at community-based hospitals and air quality data were collected from 1st January, 2002 to 31st December, 2005 in L District of Jinan, Shandong province.Onthe basis of controlling for some confounding factors, such as the long-term trend of hospital admissions, ‘day of the week’ (DOW) effect, meteorological factor and so on, with semi-parametric generalized additive model (GAM) being employed, the regression model was established.

The major conclusions from this case study are:

1.  Results showed that PM10, SO2 and NO2 were all associated with increased risk of respiratory   
     hospital  admissions.

2. The best lag days for PM10, NO2 were current day (lag 0) and three days before (lag 3), while average
     moving within four days was best suitable (avg03) for SO2.

3. Relative risk for PM10 and SO2 in warm seasons were larger than in cold seasons.

4. PM10 concentration was high in the air of Jinan, which mainly came from city dusts and soil wind sand 
    dusts with weak toxicity. Those effects on respiratory health were less than those of the majority of the
    developed areas and countries.

5. Compared to the same research of the developed countries, the effect of SO2 was a little higher than  
    NO2 and PM10.

6. Female were more susceptible than the male to certain changes of pollutant level.

7. Under high pollutant concentrations, the effect of each pollutant on respiratory health became weak.


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