CALENVIROSCREEN

• CalEnviroScreen is a mapping tool that helps identify California communities that are most affected by many sources of pollution, and where people are often especially vulnerable to pollution’s effects.
• CalEnviroScreen indicators fall into four broad groups—exposures, environmental effects, sensitive populations, and socioeconomic factors. 
• The model is made up of 4 components – 2 Pollution Burden components and 2 Population Characteristics components.  Each component is made up of a set of indicators.  There are 13 Pollution Burden indicators and 8 Population Characteristics indicators.
• The scores are mapped so that different communities can be compared. An area with a high score is one that experiences a much higher pollution burden than areas with low scores.
• For each indicator, the scores are put in order from highest to lowest. This allows us to calculate a percentile for all areas that have a score.

(Source : California Office of Environmental Health Hazard Assessment,    https://oehha.ca.gov/calenviroscreen/about-calenviroscreen)

EJScreen is an EPA's environmental justice mapping and screening tool that provides EPA with a nationally consistent dataset and approach for combining environmental and demographic socioeconomic indicators. EJScreen users choose a geographic area; the tool then provides demographic socioeconomic and environmental information for that area.  EJScreen includes a method for combining environmental and demographic indicators into EJ indexes.

EJScreen includes:

• 13 environmental indicator 
• 7 socioeconomic indicators 
• 13 EJ Indexes 
• 13 supplemental indexes 

Each EJ and supplemental index combines socioeconomic indicators with a single environmental indicator. The tool provides a number of capabilities including:

• Color coded mapping
• The ability to generate a standard report for a selected area
• Comparisons showing how a selected area compares to the state or the nation

EJScreen users should note there is substantial uncertainty in demographic and environmental data, particularly when looking at small geographic areas. EJScreen is not intended to provide a risk assessment. Also, EJScreen does not provide data on every environmental impact and demographic indicator that may be relevant to a particular location, and data may be several years old. Screening results should be supplemented with additional information and local knowledge to get a better understanding of the issues in a selected location.

(Source : California Office of Environmental Health Hazard Assessment,    https://oehha.ca.gov/calenviroscreen/about-calenviroscreen)