河北省大气污染时空变化特征及其影响因素
何振芳, 郭庆春, 刘加珍, 张莹莹, 刘杰, 丁航

Spatio-temporal variation characteristics of air pollution and influencing factors in Hebei province
HE Zhen-fang, GUO Qing-chun, LIU Jia-zhen, ZHANG Ying-ying, LIU Jie, DING Hang
图3 河北省AQI季节分布
Fig. 3 The seasonal distribution of AQI in Hebei province