How Sensitive Morphological Parameters Influence on the PM2.5 Diffusion: An Empirical Study of Two Neighborhoods in Central Beijing

Air quality is highly related to the health of a human being. Urban morphology has significant influence on air quality; however, specific relationship between urban characteristics and at neighborhood scale yet be investigated, especially vegetation effect PM2.5 concentration diffusion. The relevant morphological parameters based affected pathways were selected, sensitivity degree laws selected quantified by numerical simulation, bivariate correlation analysis, regression analysis. results showed that Building Density (BD), Block Envelope Degree (BED), Average Volume (ABV), Floors (ABF), Standard Deviation Height (SDH) Greenbelt Coverage Rate (GCR) Sensitive Morphological Parameters (SMPs). A positive cosine curve trend BD BED with was observed. GCR dust retention along vertical canopy height. When ABV = 40,000 m3 ABF 20F, lowest examined, while increased SDH could promote airflow enhance capacity Finally, morphology-optimization strategies proposed scale: (1) Decreasing street; (2) considering species appropriate height increasing GCR; (3) neighborhoods appropriately controlling distinguishing internal neighborhoods. study apply scientific basis for planning design healthy livable cities.