Sensitivity analyses for two different spline modelsa.

aCurrent day temperature and humidity (lag 0) and 2-day moving average of PM10 (lag 1) are used, 3 df for temperature and humidity is applied.Sensitivity analyses for two different spline modelsa.采用当日气温与湿度（滞后0阶）以及PM10的两日移动平均（滞后1阶）作为输入变量，针对气温和湿度应用3个自由度（degrees of freedom，df），并对两种不同的样条模型开展敏感性分析。