Influence of urban forest size and form on PM2.5 and O3 concentrations: A perspective of size threshold

https://link.springer.com/article/10.1007/s11869-025-01722-7?utm_source=springer_etoc&utm_medium=email&utm_campaign=CONR_11869_AWA1_GL_DTEC_054CI_TOC-050725&utm_content=etoc_springer_20250705

Urban forest (UF) is an effective means of mitigating air pollution. At the stage where PM_2.5-O₃ composite pollution is prevalent and UF expansion reaches a bottleneck, optimizing UF form based on its area size becomes a superior management strategy. However, existing research has not fully explored the threshold effects of UF size. Using the panel threshold regression model, this study examines relationships between air pollution and UF (size and form) in 305 counties within the Yangtze River Delta (YRD) from 2014 to 2022.