[Effect of ambient air PM10 concentration on the hospital outpatient visit of respiratory diseases in Shenzhen City].

OBJECTIVE

To explore quantitatively the impact of the ambient air PM10 concentration (inhalable particulate matter) on the hospital outpatients for respiratory diseases.

METHODS

Daily hospital visits data in 2008 was collected from a hospital in Shenzhen, meteorological data and air pollution data were collected from Shenzhen Meteorological Bureau and Shenzhen Environmental Protection Bureau, respectively. There was a time serial analysis using semi-parameter generalized additive model extend Poisson regression, after controlled with long-term tend, the-day-of-week, meteorological factors and other air pollutants. Excess relative risks (ER) of daily hospital visits associated with increased PM10 level were estimated.

RESULTS

Ambient air PM10 concentration were no association with the increase of outpatients for respiratory in the same day. The lagged effect of 5 days with an ER of 1.113% (95% CI 0.613% - 1.616%) was observed. Except (PM10 + CO) model, the ER value increased when SO2, NO2, CO concentrations were introduced.

CONCLUSION

The ambient air PM10 concentration could positively associated with the increase of daily hospital visits for respiratory diseases in Shenzhen.