*3.3. Sensitive Morphological Parameters Filtrating*

Table 4 shows the results of the correlation analysis between morphological parameters and the *CRp* and *VRw* of different neighborhoods. Among the 10 morphological parameters, BD, BED, ABV, ABF, SDH and GCR showed strong sensitivity (*p* < 0.05) to *CRp* and *VRw* with correlation coefficients between 0.4 and 0.8. It is suggested that there is a slight interaction between morphological parameters and pollutant concentrations and wind speeds, and alterations in these morphological parameters can result in more sensitive responses in PM2.5 concentrations and wind conditions, which are Sensitive Morphological Parameters (SMPs). In contrast, the four parameters TBA, FAR, SO and PD were less sensitive (*p* > 0.05) to the PM2.5 concentration ratio and wind speed ratio, with correlation coefficients below 0.3. It is suggested that alterations in these morphological features do not appear to produce more sensitive changes in PM2.5 concentration and wind environment response.

**Table 4.** Correlation analysis of morphological parameters with PM2.5 and wind speed.


\*\* The correlation is significant at the 0.01 level (two-tailed). \* The correlation is significant at the 0.05 level (two-tailed).

Furthermore, the correlation coefficient R suggests that each SMP demonstrates an inverse trend of association between wind speed and PM2.5. Among them, BD, BED and GCR show a positive correlation with PM2.5 and a significant negative correlation with wind speed. ABV, ABF and SDH show part of negative correlation with PM2.5 and a significant positive correlation with wind speed. Therefore, the SMPs influence the transport and dispersion of air pollutants primarily via altering the wind environment in the surrounding area: increased wind speed enhances the transport and dispersion of air pollutants, resulting in reduced air pollutant concentrations. In general, the wind environment is still the main factor influencing the dispersion of pollutants. In the case of identical neighborhoods' land uses, the different morphological parameters affect the dispersion of pollutants mainly indirectly by influencing the wind environment.
