The divergency of gaseous species is much smaller than aerosol species.The correlation coefficient R2 of SO2 and HNO3 is 0.63 and 0.65, respectively.

• 气相成份之差异则不若固相成份来得大，仅HNO3有约3.；5倍的差距，SO2及HNO3的相关系数R2分别为0