Employed

Per Capita Income

Above Poverty

Economic

Preschool Enrollment

Bachelor's Education

High School Enrollment

Education

Voting

Census Response

Social

Automobile Access

Active Commuting

Transportation

Insured Adults

Healthcare Access

Retail Density

Park Access

Tree Canopy

Neighborhood

Severely Cost Burdened Low-Income Renters

Severely Cost Burdened Low-Income Homeowners

Housing Habitability

Uncrowded Housing

Homeownership

Housing

Ozone

Fine Particulate Matter (PM2.5)

Diesel Particulate Matter

Safe Drinking Water

Clean Environment

Extreme Heat

Impervious Surfaces

Outdoor Workers

Public Transit Access

Sea Level Rise

Two Parent Households

Alcohol Availability

Supermarket Access

Decision Support

Everybody should have trees and other plant life near their home. Trees are beneficial for mental and physical health in many ways. They can provide shade and cool surrounding areas, reduce stress, and promote health, wellness and physical activity.

 Trees are essential to mitigate the effects of climate change, especially extreme heat events. They can also promote physical activity by providing shade and a pleasant environment for walking and bicycling. Expanding the tree canopy in areas without a lot of trees, especially low-income communities and communities of color, can promote healthier communities. Less tree canopy can contribute to poorer health outcomes and vulnerability to climate change. Many cities have conducted tree canopy inventories and discovered major differences in tree canopy between neighborhoods.

A 2015 study, for instance, examined the distribution of urban tree canopy cover for several major cities and found a strong inverse relationship between tree canopy and Black and Hispanic populations in Los Angeles and Sacramento.

This indicator measures the percentage of land with tree canopy (weighted by number of people per acre).

Wolch, Byrne, and Newel, “Urban Green Space, Public Health, and Environmental Justice: The Challenge of Making Cities ‘Just Green Enough.’”

Cohen et al., “Impact of Park Renovations on Park Use and Park-Based Physical Activity.”

Bin Jiang, Dongying Li, Linda Larsen, William C. Sullivan, “A Dose-Response Curve Describing the Relationship Between Urban Tree Cover Density and Self-Reported Stress Recovery,” Environment and Behavior Vol 48, Issue 4 (1014): 607 – 629. https://doi.org/10.1177/0013916514552321

Kardan, O. et al, “Neighborhood Greenspace and Health in a Large Urban Center,”Sci. Rep. 5, 11610; doi: 10.1038/srep11610 (2015).

The Nature Conservancy, “Funding Trees for Health: An Analysis of Finance and Policy Actions to Enable Tree Planting for Public Health.”

Benfield, K. (2012, July 31). “The Case for More Urban Trees” https://www.citylab.com/environment/2012/07/case-more-urban-trees/2768/

Schwarz K, Fragkias M, Boone CG, Zhou W, McHale M, Grove JM, et al. (2015) Trees Grow on Money: Urban Tree Canopy Cover and Environmental Justice. PLoS ONE 10(4): e0122051. https://doi.org/10.1371/journal.pone.0122051

Charles River Watershed Association, “Stormwater, Trees, and the Urban Environment: A Comparative Analysis of Con¬ventional Street Tree Pits and Stormwater Tree Pits for Stormwater Management in Ultra Urban Environments,” 2009.

Boweler, D. et al., “How Effective Is ‘Greening’ Of Urban Areas In Reducing Human Exposure To Ground Level Ozone Concentrations, Uv Exposure And The ‘Urban Heat Island Effect’?,” Collaboration for Environmental Evidence Review 08, no. 004 (2010), www.environmentalevidence.org/SR41.html.

U.S. Environmental Protection Agency, “Reducing Heat Islands: Compendium of Strategies- Cool Roofs,” 2008.

Improving tree canopies requires many strategies to integrate trees, urban forests and plants in populated areas, as well as policies to set aside areas for parks and greenspace.

The first step to improving tree canopies is to 

 by assessing current tree canopy conditions and creating a vision for the future. These planning efforts are often referred to as urban forestry—recognizing that forests exist, and should exist, throughout cities and towns. Urban forestry planning should begin by surveying current conditions to understand strengths, gaps, and opportunities. Depending on available budget and needs, planners may conduct a tree census (inventorying individual trees), use technology like LIDAR to assess canopy, or use existing tools like the 

. These assessments should carefully consider equity—looking at canopy by neighborhood, race, income and other factors, as well as conditions such as 

 where trees can help protect health. Plans should also provide guidance about the types of trees that meet a jurisdiction’s needs. Trees have very different requirements, and also different benefits and potential liabilities, such as water needs/uptake, allergen and ozone precursor emission, shading, and root interactions with pavement. Tools such as Urban Forest Ecosystems Institute’s 

 can help jurisdictions choose trees that are right for their context. Planning efforts should also identify funding requirements and mechanisms to ensure that a jurisdiction can plant new trees, and sustain forests in perpetuity.

With plans in place to guide their efforts, jurisdictions should pursue strategies to 

. Planting strategies may be led by the public sector, required as part of development, and/or take place in partnership with non-profits, utilities and the private sector. Jurisdictions should look for opportunities to maximize health benefits in addition to tree canopy, utilizing cross-cutting strategies like green infrastructure, green roofs, vegetative buffers, and green schools. While planting new trees is important, its crucial to 

, and ensure that tools and standards are in place to ensure proper maintenance of trees and forests.

In addition to their tree canopy, jurisdictions should assess and improve greenspaces more broadly. Parks and open spaces can be ideal locations for trees, but they can also offer other benefits such as access to nature and opportunities for physical activity. See 

 for more information. Jurisdictions seeking to improve green space access should first 

. Planning efforts should typically start with an assessment of current park and open space conditions, tree coverage, community needs, health conditions and gaps. In addition to the park access indicator in the Healthy Places Index, planners should consider use or burden measures such as park space per person within service areas, as well as historic capital and operations expenditures by park, neighborhood and user—with an eye to improving access and conditions in communities that have been historically left behind. A variety of tools exist to assess park access and conditions, such as the Trust for Public Land’s 

, and the Centers for Disease Control and Prevention’s 

Parks and Trails Health Impact Assessment Toolkit

, and the California Department of Parks and Recreation’s 

Park Access Tool and Community FactFinder

Because neighborhood residents are experts about their community needs, jurisdictions should ensure that greenspace planning, design and programming incorporates residents’ ideas. California’s Statewide Park Development and Community Revitalization Program offers excellent best practices in community engagement during park planning:


Meet with residents near the project. Hold at least five park design meetings with residents at convenient locations near the project site for residents lacking transportation. Also schedule meetings at various times to accommodate work and family schedules.
Invite residents to provide their ideas. Use at least three methods to invite residents and consider language, cultural and access and functional needs, as well as child care and food. Encourage neighborhood youth, seniors, and parents to be a part of the design process so that the needs of different generations are met.
Engage in dialogue during meetings. Ask residents to identify their needs and design ideas focusing on these key factors:



Selection of the recreation features and their design;
Most practical location of features within the park; and
Safe public use and park beautification such as landscaping or art.


 before initiating larger scale park construction or rehabilitation to ensure that people are not displaced, if improvements spark increased rents.

In addition to planning, jurisdictions should 

 to ensure that they maximize health benefits. Parks should be designed with active uses and safety in mind, and coupled with programming to maximize use, ensure safety, and increase physical activity. Jurisdictions should also ensure that existing parks are well maintained, and that communities know about the parks and activities open to them.

Improving greenspace access and quality can be expensive, but there are several funding tools available to California jurisdictions and park districts. The State Department of Parks and Recreation administers 

grants through its Office of Grants and Local Services

, and has improved or created over 7,400 parks since 1964. ChangeLab Solutions has produced an excellent guide to funding tools—

Local Agency Strategies for Funding the Development and Maintenance of Parks and Recreation Facilities in California

. In addition to traditional funding mechanisms like taxes and developer fees, this guide suggests partnering with non-profit hospitals’ community benefit programs to fund park improvements. Jurisdictions can also approach their local public health department for assistance in navigating health funding. Jurisdictions should carefully evaluate the distribution of their existing resources and expenditures, for instance assessing their Capital Improvement Plans and budgets to ensure equity in greenspace funding. As part of these processes, jurisdictions should consider auditing existing park facilities and conditions (with community input and participation), assessing the relative equity of past/planned funding allocations, and investing in areas that are park poor, or with overburdened facilities. Budgeting processes should be transparent and open to the public.

Ensure that greenspaces encourage health through thoughtful design, programs, and outreach.

Community Power and Connection

Food Access

Physical Activity

Strong Evidence

Park Programming

Sufficient Evidence

Education and Outreach

Promising

Existing Green Space Rehabilitation and Upkeep

Activity Programs for Older Adults

Equity

Violence Prevention and Safety

Climate

Park Design

Assess current greenspace conditions and shape policies to encourage equitable access.

Joint or Shared Use Agreements

Brownfield Remediation

Neighborhood Parks, Pocket Parks, and Parklets

Trails, Linear Parks, and Greenways

Emerging

Shoreline Parks

Pollution

Healthy Transportation Access

Develop tools and programs to plant trees and other vegetation.

Green Paid Job Training and Placement Programs for Groups that Face Barriers to Employment 

Green Schools

Healthy Neighborhoods

Green Infrastructure

Green Roofs

Urban Forestry Planting Initiatives

Street Tree Ordinances 

Vegetative Buffers 

Create tools and set standards to preserve and maintain existing trees and forests.

Preservation Ordinances

Community Land Trusts

Best Practice

Management Program and Standards 

Assess current tree canopy conditions and create a vision for the future, while proactively addressing inequities by neighborhood.

Policy Guide

Tree Canopy

Make Greenspaces Safe and Active

Plan for Greenspace

Plant Trees

Preserve Existing Trees

Plan for Trees