The impact of environmental quality on mental health: an ecological study

Purpose A growing body of research suggests that exposure to natural environments has several mental health effects. This paper aims to evaluate whether countries with high-quality environments report fewer mental health disorders. Design/methodology/approach This study uses secondary data from the Legatum Centre for National Prosperity. The data set consists of data from 167 countries collected between 2007 and 2023. The authors use panel data regressions to formally investigate the impact of environmental quality on mental health outcomes. Findings The results suggest that overall environmental quality is positively related to mental well-being. However, the connection between environmental quality and mental health varies depending on the specific environmental and mental health factors analysed. Specifically, the authors find that air quality and the quality of blue spaces are positively associated with emotional well-being. Furthermore, death by suicide is negatively correlated with air quality and the quality of a country’s green spaces. The authors find no evidence to suggest that environmental quality impacts the prevalence of depressive disorders in a country. Originality/value In contrast to previous studies that primarily focused on individual-level analyses, the research adopts an ecological approach. In addition, this study evaluates the relationship between mental health and a wide range of environmental factors, namely, emissions, air quality, ocean health, land use, forest and soil quality, freshwater quality and preservation efforts. This research further distinguishes itself by using a large panel database to investigate the impacts of the natural environment on mental health.