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In land-use planning, urban green spaces are open-space areas reserved for parks and other "green spaces", including plant life, water features – also referred to as blue spaces – and other kinds of natural environment. Most urban open spaces are green spaces, but occasionally include other kinds of open areas. The landscape of urban open spaces can range from playing fields, to highly maintained environments, to relatively natural landscapes.

Generally considered open to the public, urban green spaces are sometimes privately owned, such as higher education campuses, neighborhood/community parks/gardens, and institutional or corporate grounds. Areas outside city boundaries, such as state and national parks as well as open space in the countryside, are not considered urban open space. Streets, piazzas, plazas and urban squares are not always defined as urban open space in land use planning. Urban green spaces have wide-reaching positive impacts on the health of individuals and communities near the green space.

Urban greening policies are important for revitalizing communities, reducing financial burdens of healthcare and increasing quality of life. By promoting the development of parks, green roofs, and community gardens, these policies contribute to cleaner air, mitigate urban heat effects, and create spaces for recreation and social interaction. Most policies focus on community benefits and reducing negative effects of urban development, such as surface runoff and the urban heat island effect. Historically, access to urban green space has favored wealthier and more privileged communities; thus, recent urban greening has increasingly focused on environmental justice concerns, and community engagement in the greening process. In particular, in cities with economic decline, such as the Rust Belt in the United States, urban greening has broad community revitalization impacts.

Urban areas have greatly expanded, resulting in over half of the world's population being located in urban locations. As the population continues to grow, this number is predicted to be at two-thirds of people living in urban areas by 2050.

Definitions and concepts

The World Health Organization (WHO) defined urban green spaces as "all urban land covered by vegetation of any kind". When doing research, some experts use "urban open space" to describe a broader range of open areas. One definition holds that "As the counterpart of development, urban open space is a natural and cultural resource, synonymous with neither 'unused land' nor 'park and recreation areas'." Another defines urban open space as "land and/or water area with its surface open to the sky, consciously acquired or publicly regulated to serve conservation and urban shaping function in addition to providing recreational opportunities." In almost all instances, the space referred to by the term is green space, focused on natural areas.

The spaces that are part of "public space" are broadly construed, including meeting or gathering places that exist outside the home and workplace. These foster resident interaction and opportunities for contact and proximity. This definition implies a higher level of community interaction and places a focus on public involvement rather than public ownership or stewardship.

Benefits

The benefits that urban open space provides to citizens can be broken into four basic forms: recreation, ecology, aesthetic value, and positive health impacts. Psychological research shows that benefits gained by visitors to urban green spaces increased with their biodiversity, indicating that "green" alone is not optimal; the quality of the urban green space is important as well.

Recreational

Urban open space is often appreciated for the recreational opportunities it provides. Examples of recreation in urban open spaces include active recreation (such as organized sports and individual exercise) and passive recreation. Research shows that when open spaces are attractive and accessible, people are more likely to engage in physical activity. Time spent in an urban open space for recreation offers a reprieve from the urban environment and a break from over-stimulation. Studies done on physically active adults middle-aged and older show that there are amplified benefits when physical activities are coupled with green space environments. Such coupling leads to decreased levels of stress, lowers the risk for depression, and increases the frequency of participation in exercise.

Ecological

Green spaces may improve the air quality of urban areas and provide habitat for wildlife, improving the overall ecological health of urban environments. They may also reduce the risk of flooding by providing rainwater drainage.

Aesthetic

The aesthetic value of urban open spaces is self-evident. People enjoy viewing nature, especially when it is otherwise extensively deprived, as is the case in urban environments. Therefore, open space offers the value of "substituting gray infrastructure." One researcher states how attractive neighborhoods contribute to positive attitudes and social norms that encourage walking and community values. Properties near urban open space tend to have a higher value. One study was able to demonstrate that, "a pleasant view can lead to a considerable increase in house price, particularly if the house overlooks water (8–10%) or open space (6–12%)." Certain benefits may be derived from exposure to virtual versions of the natural environment, too. For example, people who were shown pictures of scenic, natural environments had increased brain activity in the region associated with recalling happy memories, compared to people that were shown pictures of urban landscapes.

Impact on health

The World Health Organization considers urban green spaces as important to human health. These areas have a positive impact on mental and physical health. Urban open spaces often include trees or other shrubbery that contribute to moderating temperatures and decreasing air pollution. Perceived general health is higher in populations with a higher percentage of green space in their environments. Urban open space access has also been directly related to reductions in the prevalence and severity of chronic diseases resulting from sedentary lifestyles, to improvements in mental well-being, and to reductions in population-wide health impacts from climate change.

Mechanism of urban open space health effects

Access to urban open space encourages physical activity and reduces ambient air pollution, heat, traffic noise and emissions. All are factors which contribute to the risks of chronic disease and mental illness. Individuals and families who lived closer to ‘formal’ parks or open space were more likely to achieve the recommended amounts of physical activity. Better respiratory health is associated with cleaner air quality. Cleaner air quality affects rates of chronic disease in populations exposed. “High concentrations of ambient particles can trigger the onset of acute myocardial infarction and increase hospitalization for cardiovascular disease”. Besides an association with lower Body Mass Index (BMI)/obesity rates, this physical activity can increase lung function and be a protective factor against respiratory disease. Exposure to nature improves the immune system. Contact of the human body with soil, turf, or forest floor, exposes it to many microorganisms which boost the immune system.

Reductions in chronic disease rates

Improved access to green space is associated with reductions in cardiovascular disease symptoms, improved rates of physical activity, lower incidence of obesity, and improved respiratory health. Lower rates of cardiovascular biomarkers are associated with access to green space, showing a reduction in cardiovascular disease risk in populations living within 1 km of green space. Not only does access to urban green space reduce risk of cardiovascular disease, but increased access has been shown to improve recovery from major adverse cardiovascular events and lower all-cause mortality. Relationships have been found between increased access to green space, improved rates of physical activity, and reduced BMI. The percentage of sedentary and moderately active persons making use of an urban park increased when access to the park was improved.

Reductions in mental illness rates and improvement of social cohesion

Globally, mental illness is linked to eight million deaths each year. In urban areas, limited access to green space and poor quality of green spaces available may contribute to poor mental health outcomes; according to some studies, people living in cities and towns may have weaker mental health in comparison to people living in less crowded areas. Urban green spaces are pieces of nature in the cities designed to try to solve the problem. The distance an individual lives from a green space or park and the proportion of land designated as open space/parks has been shown to be inversely related to anxiety/mood disorder treatment counts in the community. Improved mental health may therefore be related to both measures – to distance from open space and proportion of open space within a neighborhood. Even when physical activity rates are not shown to increase with greater access to green space, greater access to green space has been shown to decrease stress and improve social cohesion.

Effects on respiratory health

Adequate urban green space access can be associated with better respiratory health outcomes, as long as green space areas meet certain requirements. A study showed that mortality due to pneumonia and chronic lower respiratory diseases could be reduced by minimizing fragmentation of green spaces and increasing the largest patch percentage of green space. Vegetation type (trees, shrubs and herbaceous layers) and lack of management (pruning, irrigation and fertilization) has been shown to affect a higher capacity to provide the ecosystem services of air purification and climate regulation within green urban spaces. The types of plants and shrubs are important because areas with large tree canopies can contribute to asthma and allergic sensitization.

Impacts on high temperatures

Urban areas tend to have higher temperatures than their surrounding undeveloped areas because of Urban heat islands, UHIs. Urban heat islands are areas with man-made infrastructure that contribute to increased temperatures. The average temperature during the day in cities can be 18–27 degrees Fahrenheit higher than in the surrounding rural regions. This is an example of one type of UHI, surface heat islands. Surface heat islands encompass the area from the ground to the top of the tree-line. It is usually higher during the day when direct sunlight reaches urban structures (often with darker materials than natural areas) including the main contributor, pavement. The other type of UHI, atmospheric heat islands, are from above the tree-line to the level in the atmosphere where the urban area no longer has an effect. This type of heat island has increased heat at night due to the release of heat from infrastructure that built up throughout the day.

Green spaces within urban areas can help reduce these increased temperatures through shading and evapotranspiration. Shading comes from the taller plants, such as trees, that can contribute to lowering the surface heat island effect. The shade provides protection from the sun for vulnerable populations, such as children, during periods of increased temperature, during the summer months or during a heat wave. Tree cover prevents some solar radiation from reaching the ground with its leaves and branches. This reduces the effect of surface urban heat islands. Open spaces that include any type of vegetation help offset the high temperatures through the natural process of evapotranspiration. Evapotranspiration releases water into the air therefore dissipating heat. There are many elements of an urban open space that can contribute to the mitigation of urban heat islands including the type of open space (park or nature reserve), type of plant species, and the density of vegetation. Green spaces contribute to the reduction of local heat, decreasing the overall effect of UHIs. The larger the distribution of green spaces, the bigger the area of heat reduction. Green spaces that are clustered together will have an additive heat reduction resulting in a greater decrease in temperature in the local area compared to surrounding areas.

Impacts on air quality

Human activity has increased air pollution in the Earth's atmosphere and trees play an essential role in removing human-made pollutants from the air, aka particulate matter (PM). Trees produce oxygen and absorb CO₂. In urban green spaces, trees filter out man-made pollutants. Air quality data collected on cities with and without urban green space has shown that areas with an abundance of trees have considerably less air pollutants, i.e. O₃, PM₁₀, NO₂, SO₂, and CO. As air pollutants accumulate in the atmosphere, vulnerable populations, such as children, may suffer from increased incidences of respiratory disease. Particulate matter or particle pollution with a diameter of 10 microns (PM10) or 2.5 microns (PM2.5) is associated with heart diseases and respiratory diseases including lung cancer.

Globally, particulate matter has increased over 28% in indoor air and 35% in outdoor air. Children spend most of their time at school, around 10 hours daily, and the indoor and outdoor air has a large impact on their health. Schools located in urban areas have higher particulate matter than schools in rural areas. Compared with children in schools located in rural areas, children who attend schools located in industrial areas and urban cities have higher levels of urinary PAHs (polycyclic aromatic hydrocarbons) metabolites, which is linked to air pollution.

Green spaces can reduce the pollution of particulate matter by preventing distribution of particulates from pollutants or by reducing the particulate matter from traveling to other places. There is a disagreement about the association of living near green spaces or having high exposure to greenness and illness such as allergies, rhinitis, and eye and nose symptoms. Higher exposure to tree canopy and pollen was associated with a high risk of prevalence rhinitis, allergic sensitization, wheezing, and asthma among children 7 years-old. More studies are needed to explain the effect of urban green spaces on children relating to air quality. These studies should take into consideration the interconnectedness of tree species, geographic areas, temperature, and other pollutant-like traffic.

For children and adolescents

Impacts on physical health

The adolescent years are important for children due to it being a time of growth, development, and instillation of habits. When children are given the opportunity to be active, they typically take advantage of it. Children with a greater access to parks and recreational facilities through urban green space have been found to be more active than children who lack access. The access to green spaces has shown an association with recreational walking, increased physical activity, and reduced sedentary time in all ages. In coordination, it has been seen that higher residential green space is associated with lower BMI scores. If children are given the opportunity to be active and maintain a healthy BMI in their adolescent years, they are less likely to be obese as adults.

Impacts on mental health

Children exposed to urban green spaces have the opportunity to expend energy by interacting with their environment and other people through exercise. One study has shown that without access to urban green spaces, some children have problems with hyperactivity, peer interactions, and good conduct. The important interactions with nature, animals, and peers have been positively influential in child development and reduction in behavioral issues such as Attention Deficit Hyperactivity Disorder (ADHD). With urban green space giving children the opportunity to get outside and expend energy, children are more focused in school and have a better working memory and reduced inattentiveness.

Another facet of urban green space improving mental health is giving children access to a community. Recreational activities and playing at the park gives children opportunities to interact with other children and develop a social circle and social skills in general. Children with a good social network feel socially included, promoting more confidence and well-being in their everyday lives. Overall, the bonding experiences that result from urban green spaces tie in with a child's cognitive and social development.

A 2021 study found that higher exposure to woodland urban green spaces or urban forest but not grassland is associated with improved cognitive development and reduced risks of mental problems for urban adolescents.

History

Ancient Rome

The term "rus in urbe" meaning "country in the city" was used in Rome around the first century C.E. Urban planning in Rome valued the natural landscape and took account for environmental factors. It was thought that by building a city with regard to the local countryside, the people living there would be healthier and happier. English landscapes would later take inspiration from Roman urban planning concepts in their own open spaces.

Islamic Era

Islamic gardens are distinctive green spaces that blend cultural, religious, and practical elements, serving as earthly representations of paradise. Typically featuring symmetrical designs, often in a four-fold pattern called chahar bagh or chahār bāgh with fountains, flowing channels, or reflective pools. Modern interpretations of Islamic gardens can be found in various locations, such as the Islamic Gardens at King's Cross in London, which showcase contemporary landscaped spaces representing the diversity of Muslim culture. The concept of Islamic gardens spread widely from Persia to Spain, North Africa, and India, influencing garden design across various Islamic empires. While maintaining core principles, these gardens often incorporated local elements and adapted to regional climate.

London

London, England has a long history of urban open space, which has influenced development of modern parks, and is among the greenest capital cities in the world.

The basis for many urban open spaces seen today across Europe and the West began its process of development in London in the 17th and 18th centuries. What would eventually become urban open green space began as paved public plazas. Though they were intended to be open to the public, these spaces began to be re-designated as private parks around the late eighteenth century. It was during this period that the areas became pockets of green in the urban environment, commonly modelled after the natural wild of the countryside.

The first parks to reverse the trend of privatization and again be opened to the public were England's royal parks in the nineteenth century. This was done in response to the extensive and unexpected population movement from the country into cities. As a result, "the need for open space was socially and politically pressing… The problems, to which the provision of parks was expected to offer some relief, were easy to describe: overcrowding, poverty, squalor, ill-health, lack of morals and morale, and so on".

China

China's Fourteenth Five-Year Plan's Climate Change Special Plan emphasizes ecologically-oriented urban planning, including the use of urban green rings.

Current trends

Segmentation of urban open spaces was particularly prominent in America during the twentieth century. Since the late 1800s romantic park systems, open space designers have been concerned with guiding, containing or separating urban growth, distributing recreation, and/or producing scenic amenity, mostly within the framework of geometric abstractions." Such segmentation was especially prominent in the 1990s, when urban open spaces took a path similar to that of parks, following the modernization trend of segmentation and specialization of areas. As modernity stressed "increased efficiency, quantifiability, predictability, and control… In concert with the additional social divisions", open spaces grew more specific in purpose.

In the 20th century, places like Scandinavia saw a proliferation of urban open spaces and began adopting a lifestyle supported by the extra urban breathing room. An example of this can be seen in Copenhagen where an area closed to car traffic in 1962 developed, in just a few decades, a culture of public political gatherings and outdoor cafes emerged.

Non-sustainable gardening, including mowing, use of chemical fertilisers, herbicides and pesticides harm green spaces. Contrariwise, one of the conditions for good urban open space is sustainable gardening.

At the beginning of the 21st century, studies began to show that living in areas near water (known as "blue spaces") considerably improved physical and mental health, increasing life longevity.

Inequalities

Neighborhoods with higher percentages of minority residents often have lower access to open space and parks as the result of past red-lining policies and current inequities in funding priorities. Urban open space is under strong pressure. Due to increasing urbanization, combined with a spatial planning policy of densification, more people face the prospect of living in less green residential environments, especially people from low economic strata. This may cause environmental inequality with regard to the distribution of (access) to public green space. The parks that do exist in minority neighborhoods are often small (with lower acreage per person than parks in majority ethnicity neighborhoods), not well maintained, unsafe, or are otherwise ill-suited for community needs. A large epidemiological study concluded that wealthier individuals were generally healthier than individuals with a lower income, explained by the pattern that wealthier individuals reside in areas more concentrated with green space. Urban open spaces in higher socioeconomic neighborhoods were also more likely to have trees that provided shade, a water feature (e.g. pond, lake or creek), walking and cycling paths, lighting, signage regarding dog access and signage restricting other activities as well. This difference in access has been proven, however, further study is needed to evaluate the exact health impacts.

A study conducted in Australia provided insight into how there is a correlation between community development/community safety and natural open space within the community. Open areas allow community members to engage in highly social activities and facilitate the expansion of social networks and friendship development. As people become more social they decrease the perceptions of fear and mistrust allowing a sense of community. Distant or lack of adequate green space, therefore, may contribute to higher rates of inactivity and greater health effects among minority populations.

Green gentrification

See also

• Blue space – Areas dominated by surface waterbodies
• Eco-cities – Human settlement closely modeled on natural ecosystems
• Green belt – Largely undeveloped, wild, or agricultural land surrounding urban areas
• Green track – Railway trackbed planted with grass or other vegetation
• Greening – Process of incorporating more environmentally friendly behaviors or systems
• Greenway (landscape) – Shared-use path or linear park with vegetation
  • Linear park – Long strip of naturally occurring land for recreation
  • Rail trail – Railroad bed converted to a recreational trail
• Open space reserve – Conserved land or water
• Park – Area of naturally occurring land set aside for visitor enjoyment and other purposes
• Particulates – Microscopic solid or liquid matter suspended in the Earth's atmosphere
• Principles of Intelligent Urbanism – Theory of urban planningPages displaying short descriptions of redirect targets
• Sustainable city – City designed with consideration for social, economic, environmental impact
• Urban forest – Collection of trees within a city, town or a suburb
• Urban prairie – Vacant urban land reverted to green space
• Urban reforestation – Planting of trees in urban environments
• Urban vitality – Intensity of use of an urban area
• Village green – Common open area within a settlement
• Wildlife corridor – Connecting wild territories for animals

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Further reading

• McDonald, R. I.; Forman, R. T. T.; Kareiva, P. (2010). "Open Space Loss and Land Inequality in United States' Cities, 1990–2000". PLoS ONE. 5 (3): e9509. Bibcode:2010PLoSO...5.9509M. doi:10.1371/journal.pone.0009509. PMC 2831069. PMID 20209082.

• Urban public parks
• Urban planning
• Urban studies and planning terminology
• Greenways
• Regional parks
• Protected areas
• Zoning