The health benefits of the great outdoors: A systematic review and metaanalysis of greenspace exposure and health outcomes

Environmental ResearchVolume 166, October 2018, Pages 628-637

In a recent review Caoimhe Twohig-Bennett and  Andy Jones show that:

Greenspace exposure is associated with wide ranging health benefits, with meta-analyses results showing statistically significant associations with reduced diastolic blood pressure, heart rate, salivary cortisol, incidence of type II diabetes and stroke, all cause and cardiovascular mortality, as well as health-denoting associations with pregnancy outcomes, HRV, and HDL cholesterol, and self reported health. The findings of this systematic review suggest that the creation, regeneration and maintenance of accessible greenspaces and street greenery may form part of a multi-faceted approach to improve a wide range of health outcomes.

https://www.sciencedirect.com/science/article/pii/S0013935118303323