Table 1 and original data

The major aims of this study are that exploring the baseline values of PM2.5 in 31 provinces in China using the cumulative frequency curve method. Then, the provinces are classified according to the relationship between baseline values, monitoring values and standard values. Finally, the PM2.5 hierarchical management strategy is proposed for the three types of provinces obtained.本研究的主要目标为：采用累积频率曲线法，探究中国31个省份的细颗粒物（PM2.5）基准值；随后依据基准值、监测值与标准值三者间的关联对各省进行分类；最终针对所得的三类省份，提出PM2.5分级管控策略。