*4.1. Trend Analysis of the Influence of SMPs*

Figure 8 shows the interaction curves of the six SMPs with PM2.5 and wind speed. It also demonstrates that the effect of each SMP on PM2.5 concentration and wind speed has an inverse connection within a particular interval, but the outcomes of other intervals on PM2.5 concentration and wind speed are different.

**Figure 8.** Curve fitting of different morphological parameters with PM2.5 and wind speed: (**a**) BD; (**b**) GCR; (**c**) BED; (**d**) ABF; (**e**) ABV; (**f**) SDH.

According to Figure 8, wind speed is the most important element influencing PM2.5 dispersion, and high wind speeds promote pollution transport and dispersion. The spatial morphological characteristics of distinct neighborhoods define their internal wind environment under the same incoming wind speed conditions, which has an impact on the transport dispersion and concentration distribution of air pollutants. Furthermore, the different impact results are exhibited by the morphological parameters in different intervals. It is claimed that there are parameter intervals for each morphological parameter that are more positive (or less positive) to the transmission and dispersion of air contaminants.
