Fig. 1. Spatial distribution of industrail point sources and pollution loads in Zhangjiakou city

Fig. 2. Spatial distribution of industrail point sources and river systems in Zhangjiakou city

Fig. 3. Hotspot analysis of industrial point source pollution loads in Zhangjiakou

Fig. 4. Spatial distribution of heavily polluting industrial point sources in Zhangjiakou city

Fig. 5. Spatial distribution of moderately polluting industrial point sources in Zhangjiakou city

Fig. 6. Spatial distribution of slightly polluting industrial point sources in Zhangjiakou city

Fig. 7. Spatial distribution of industrail point sources of different scales in Zhangjiakou city