陕西区域环境空气质量时空特征

张佳音, 郭云飞, 肖舜, 杜涛, 郑淏, 刘焕武, 王蕾, 何延新

The temporal and spatial characteristics of ambient air quality in Shaanxi

Jiayin Zhang, Yunfei Guo, Shun Xiao, Tao Du, Hao Zheng, Huanwu Liu, Lei Wang, Yanxin He

图2 2017—2021年陕西区域优良天和重度及以上污染天比例变化

Fig.2 Proportion change of excellent and good days， severeand above pollution days in different regions of Shaanxi during 2017-2021