Request > Impacts of green and blue space on mental health

Which types and components of urban and peri-urban blue/green spaces have a significant impact on human mental health and mental well-being?

Requester: Expert Working Group Biodiversity & Health, French Ministry of Ecological Transition (MTES) and the World Health Organization (WHO).

Type of request: Knowledge Synthesis

For several years, papers have been published about the positive impact of greenness on health, including some synthesis and systematic reviews. Yet, none of them has so far addressed the question of the type of habitats and components of such habitats that have a significant (and preferably positive) effect on mental health and psychological well-being. This is important in order to provide recommendations to designers and managers of green and blue space in and around cities.

The aim of this request is to provide recommendations regarding the design, management and creation of natural spaces in urban or suburban areas in order to promote the mental health of urban inhabitants.

Reference: Request CfR.1/2016/2

Expert Working Group
  • Sjerp de Vries (Wageningen Environmental Research (Alterra), Wageningen University and Research) (Chair)
  • Maria Beatrice Andreucci (Sapienza Università di Roma) (Chair)
  • Anna maria Lammel (Université Paris 8) (Chair)
  • Zoe Davies (University of Kent)
  • Julie Glanville / Hannah Wood (York Health Economics Consortium)
  • Hans Keune (University of Antwerp)
  • Melissa Marselle (Friedrich Schiller University Jena)
  • Liz O’Brien (Forest Research, Forestry Commission UK)
  • Agnieszka Olszewska-Guizzo (National University of Singapore/ Neurolandscape)
  • Roy Remmen (University of Antwerp)
  • Alessio Russo (Far Eastern Federal University)

Additionally, Femke Beute joined this group to support the knowledge synthesis process as a research assistant.

Contact points

KCB Focal Point: Barbara Livoreil (until mid-2019) / Allan Watt and Juliette Young (from 2019 on)
EMB Contact Point: Karla E. Locher

Final outputs

Document of Work: file.08.09.2017
Methods protocol: file.21.07.2019

Final Report Green spaces and mental Health: to be launched 2nd week of March
Final Report Blue spaces and Mental Health: to be launched 2nd week of March

World Health Organization (WHO) booklet: to be launched 2nd week of March

Podcast: to be launched in March

Summary of the concussions and recommendations to be available the second week of March 2021

Impact in Policy

Science for Environment Policy (2021) The solution is in nature. Future Brief 24. Brief produced for the European Commission DG Environment. Bristol: Science Communication Unit, UWE Bristol (link)

The impact of the quality of the environment on human health is well described and increasingly taken into account for urban and peri-urban design and policies; however, this is not the case for the impact of biodiversity on mental health and well-being.

Biodiversity may have a great impact on our well-being and mental health. A systematic review of the health and well-being benefits of biodiverse environments has been published in the Journal of Toxicology and Environmental Health (Lovell et al. 2014).  It shows that a biodiverse nature has positive effects on mood and is good for health and that disturbed ecosystems might have a negative effect on human well-being. Bowler et al. (2010) show further evidence of the added benefits to health of exposure to natural environments by conducting a systematic review that compares health or well-being measurements in natural and built environments; however, this review did not explicitly mention biodiversity as such. In 2010, a study of the Faculty of Public Health showed that green spaces can lower the incidence of hyperactivity or depression and that, conversely, people without access to green spaces are more likely to develop stress or anger-again, without explicitly referring to biodiversity (Faculty of Public Health, 2010; Gidlofgunnarson, Ohrstrom, 2007). The importance of natural elements and their impact on mental health can be demonstrated in initiatives such as developing therapeutic gardens aiming to help Alzheimer patients. These studies suggest that there may be some evidence available to enable the design of green spaces to benefit human mental health and mental well-being.


Date request received: 27/09/2016
Date of Experts Working Group kick-off meeting: 04/07/2017
Call for Knowledge: March–April 2017
Call for Experts: September-October 2017
Date of experts selection: November 2017
Date of the online EWG kick-off meeting: November 2017
Date of the first meeting with the requesters and EKLIPSE KCB and methods experts: March–April 2017

In June 2016, a request was received by Expert Working Group Biodiversity & Health, 3rd National Action Plan on Health and Environment (PNSE3) – Ministry in charge of the Environment (MTES), France, and the World Health Organization (WHO).

This request aims to provide recommendations regarding the design, management, and creation of natural spaces in urban or suburban areas to promote urban inhabitants’ mental health.

Scoping phase

Initially, the requester suggested providing the current knowledge of green spaces’ effects on mental health and physical health. Based on the discussion results between the KCB, the requesters, and the Call for Knowledge (CfK) carried out on April-May 2017. It was agreed to refine the request question to target mental health and psychological well-being and omit physical health (unless linked to mental health in existing research). Psychological disorders were also included in the request’s scope, but indoor greenness (houses, workplaces) would not be considered. The requester has a specific interest in positive impacts to generate recommendations for designing and managing green and blue spaces in cities or nearby neighbourhoods and initially required a systematic review approach.

The CfK specifically resulted in the identification of 6 reviews, 18 articles and about 30 other references provided by experts through the KNOCK Forum. Based on the scoping process and the Call for Knowledge, a Document of Work (DoW) was compiled.

Answering the request

Selection of an Experts Steering Group (see above)

To answer this request, Eklipse sent out a Call for Expertise (CfE) and selected 11 experts in November 2017. These experts covered a broad range of expertise, gender and geographical representation to form the Eklipse Expert Working Group (EWG).

The next step was for the Expert Working Group to develop a methodological protocol based on the DoW, including the scientific aspect of a thorough literature search and possible appraisal. From the identified methods, the expert working group decided on performing a systematic review that will follow the following steps:

1) Eligibility criteria for the articles will be formulated
2) A systematic search strategy will be employed to yield relevant articles
3) Meta-data will be extracted and coded for each eligible study
4) Each study will be critically appraised
5) A narrative and descriptive synthesis will be performed
6) Outcomes of the synthesis will be discussed

Methods Protocol

During the scoping process, the EKLIPSE Methods Expert Group (MEG) and the Knowledge Coordination Body (KCB) Health group discussed potential knowledge synthesis methods, which can be applied for this request. Building on the discussions and materials prepared by the EKLIPSE MEG, the following methods were suggested for the different steps of the request:

  • Cochrane-style systematic review
  • Solution scanning, meta-analysis
  • Rapid evidence assessment
  • Causal Chain Analysis
  • Systematic review

After analysing the available knowledge and other elements like the purpose of the question, time and resources available, consequences and controversies among others (to have more information on methods criteria section, please follow this link), the EWG support by the MEG and considering the open consultation on the methods protocol decided to perform a systematic review. The systematic review allowed the group to analyse the scientific literature that focused on the influence of type and characteristics of green and blue spaces concerning mental health and wellbeing benefits in cities and sub-urban areas in an interdisciplinary way. For practical reasons, the EWG decided to perform two separate reviews: blue and other for green spaces.


The draft report developed by the expert working group to answer the question of “which types and components of urban and peri-urban blue spaces have a significant impact on human mental health and mental well-being” was released for external review (22nd January 2020-28th of February 2002). The second systematic review draft to understand “which types and components of urban and peri-urban green spaces have a significant impact on human mental health and mental well-being” was released in summer 2020. The EWG has integrated the comments from these processes, and the final reports will be available in the second week of March 2021.