The Effect of Air Pollution and Temperature on Pulmonary Function in Healthy People in Xi’an, China
Abstract Background Temperature and air pollution has been reported to be associated with respiratory diseases. However, little is known about these effects on healthy people, and the potential interaction between the two factors is still uncertain. This study aims to estimate the effects of air pollution combined with temperature on lung function in healthy people. Methods The lung function of 132 healthy people was measured in Xi’an, Shaanxi province of Northwest China in summer and winter. Meanwhile, the daily concentrations of air pollution and temperature were obtained from monitoring stations. Statistical analyses were assessed by generalized estimating equations (GEEs). Results Every 10μg/m 3 increase of PM 2.5 concentration, PEF change amount is -0.007L/min (95% CI: -0.013, -0.001 L/min), FEV1 is -0.004 (95% CI: -0.006, -0.001 L/min),FEF25-75% is -0.002(95% CI: -0.003, -0.001 L/min) FEV1/FVC change amount is -0.074 L/min (95% CI: -0.115, -0.033 L/min). Lag effects showed that Lag0 of FEV1, FEV1/FVC and FEF25-75% were more strongly associated with PM2.5. There was no significant interaction between PM 2.5 and temperature. Conclusions Our findings indicate that PM 2.5 has an acute adverse effect on lung function in winter, and the lung function is less affected by temperature change in Xi’an.