According to a systematic review of 153 articles, biodiversity and naturalness are the characteristics of green spaces that are most strongly connected to positive social relations and improvements in health.
Reyes-Riveros, Rosa, Adison Altamirano, Francisco De La Barrera, Daniel Rozas-Vásquez, Lorena Vieli, and Paula Meli. “Linking public urban green spaces and human well-being: A systematic review.” Urban Forestry & Urban Greening 61 (2021). https://doi.org/10.1016/j.ufug.2021.127105
