Research Article

Difference Equation Model-Based Prediction considering the Spatiotemporal Propagation: A Case Study of Bohai Rim Region, China

Figure 6

The daily PM2.5 concentration level from July 1, 2020, to September 30, 2020. Blue line represents the prediction value and red line stands for the real data: (a) Cluster1: D = 0.1196, (b) Cluster2: D = 0.1266, ; (c) Cluster3: D = 0.2572, (d) Cluster4: D = 0.4208, .
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