4.2.1. Moran Scatter Plot Results and Analysis

The point in the Moran scatter plot represents an area, and the slope of a linearly fitted curve is equal to the global Moran's *I*. According to the global Moran's *I* results, there is a high correlation between haze and spatial position in summer and autumn, and the correlation in spring and winter is low. Moran scatter plots for summer, autumn, winter, and spring are shown in Figure 6a–d.

**Figure 6.** The Moran scatter plot in and respectively. (**a**) summer, (**b**)autumn, (**c**) winter, and (**d**) spring.

Figure 6a shows that four blocks are in the first quadrant, one block is in the second quadrant, and four blocks are in the third quadrant, and there are generally positive correlation characteristics. Blocks 5, 7, 8, and 9 are in the first quadrant, exhibiting the characteristics of high–high, which means that the haze levels in these four blocks are high, and there is a high positive correlation. Block 4 is in the second quadrant and has a characteristic of low–high. Blocks 1, 2, 3, and 6 are located in the third quadrant, exhibiting a low–low characteristic, and the haze levels of the four blocks are low. In general, the overall characteristics of haze in summer are aggregation type, including high concentration aggregation and low concentration aggregation.

Figure 6b shows two blocks in the first quadrant, two blocks in the second quadrant, three blocks in the third quadrant, and two blocks in the fourth quadrant, which generally show a positive correlation. Blocks 8 and 9 located in the first quadrant exhibit high–high characteristics. Block 4 and Block 6 are in the second quadrant, exhibiting the characteristics of low–high. Blocks 1, 2, and 3 are in the third quadrant, exhibiting low–low characteristics. Finally, Blocks 5 and 7 are in the fourth quadrant exhibiting a 'high–low' characteristic. In general, the haze aggregation in autumn is worse than in summer, but there are fewer isolated points, and the overall appearance is aggregated.

The global Moran's *I* is small in spring and winter, and the correlation between haze and geographic location is generally weak. There is no block with 'high–high' characteristics in the spring, and the other three characteristics are evenly distributed. The coefficient of positive correlation of the overall haze is also low, and the distribution is discrete. There is no high–high characteristic in winter, but there are more low–low

blocks, and the correlation is better than in spring. The remaining low-concentration areas surround two high-concentration areas, and the overall distribution shows low concentration aggregation.
