Urban Green Spaces and Health: A Review of Evidence
About this book
Urban Green Spaces and Health: A Review of Evidence, published by the World Health Organization Regional Office for Europe in 2016, synthesises the scientific evidence on the health effects of urban green spaces and provides guidance for urban planners and public health practitioners on how to optimise the design and distribution of parks, urban forests, green corridors, and other nature-based elements within cities. The review draws on epidemiological studies, exposure-response research, and systematic reviews published predominantly over the preceding 15 years. The WHO review organises the evidence into five principal health benefit pathways: (1) physical activity facilitation — green spaces provide accessible settings for walking, cycling, and recreation, with studies showing consistent associations between proximity to parks and higher recreational physical activity levels, particularly among older adults and children; (2) stress reduction and mental health — restoration theory predicts and studies confirm that exposure to natural environments reduces cortisol levels, lowers blood pressure, and improves mood state, with research showing stronger effects for 'green' compared to 'grey' urban scenes; (3) social cohesion — shared green spaces facilitate positive social interactions and community belonging, with documented effects on trust and reduced crime perceptions; (4) heat mitigation — urban greenery reduces surface and air temperatures through evapotranspiration and shading, with urban forest canopy cover reducing peak summer temperatures by 2–8°C in street canyons; and (5) air pollution reduction — trees absorb pollutants including ozone, PM10, and nitrogen dioxide, though the review notes that trees can also emit biogenic VOCs under heat stress.
The document examines health equity dimensions, reviewing evidence that lower-income urban residents often have less access to quality green space while simultaneously experiencing greater environmental health burdens. It highlights that the health benefits of urban greenery are not automatically distributed equitably and that targeted investment is needed in deprived neighbourhoods. Design guidance addresses the importance of green space quality and characteristics — the presence of water features, diversity of vegetation, perceived safety, maintenance quality, and accessibility — as determinants of actual use and therefore health benefit realisation.
The 300-metre proximity standard and a minimum size of 1 hectare for meaningful greenspace are presented as planning benchmarks, while acknowledging that smaller green elements including street trees, green roofs, and bioswales can contribute incrementally. The report concludes with recommendations for integrating health evidence into urban planning regulations, green space management guidelines, and public health surveillance systems that include green space access as a social determinant of health indicator.