From the analysis of correlation of O3 and NO2, It can be found that NO2 contributes to the O3 formation and there are some other important precursors for O3.

• 由O3和NO2的相关性分析可知，NO2对大气中O3的含量有着一定的贡献，大气中可能还存在其它重要的O3前体污染物。