北京市气温与空气污染指数相关性分析

Correlation between ambient temperature and air pollution index in Beijing

摘要: 目的研究气温对空气污染指数的影响。方法运用分布滞后非线性模型，利用2001-2012年北京市空气污染指数（API）数据，计算气温对API影响的相对危险度。结果北京市API呈现下降趋势，气温与API之间呈负相关关系（r=-0.212，P<0.001），高温（P₉₀）对API影响的相对危险度为1.85（95%CI=1.63~2.10），低温（P₁₀）对API影响的相对危险度为0.38（95%CI=0.32~0.45），存在滞后效应和累积效应。结论气温对空气污染指数有影响。

Abstract: Objective To assess the impact of ambient temperature on air pollution index (API).Methods Using distributed lag nonlinear model,the relative risk of the impact of ambient temperature on API was calculated by using the API data of Beijing during 2001-2012.Results API showed a downward trend in Beijing.There is a significantly negative correlation between the ambient temperature and API,with a correlation coefficient of -0.212 (P<0.001);the relative risk is 1.85 (95 confidence interval95%CI:1.63,2.10) for high temperature (90th percentile of temperature) and 0.38 (95%CI:0.32,0.45) for cold temperature (10th percentile of temperature),and there exists a lag effect and cumulative effect.Conclusion The ambient temperature has an effect on air pollution index.