Scoring & Model
What is the CalEnviroScreen Model?
The CalEnviroScreen 3.0 model is based on CalEPA’s definition of cumulative impacts.
- The model is based on geography, specifically census tracts in California.
- It presents information for the entire state.
- 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 12 Pollution Burden indicators and 8 Population Characteristics indicators.
How is CalEnviroScreen scored?
- Each census tract receives scores for as many of the 20 indicators as possible. Some census tracts will not have scores for every one of the indicators.
- 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.
- An average of the indicators that make up a component (Exposures, Environmental Effects, Sensitive Populations, Socioeconomic Factors) is first calculated.
- The Population Characteristics score for a census tract is the average Sensitive Populations and Socioeconomic Factors component for that census tract.
- The Pollution Burden score is the average of Environmental Effects and Exposures components, where the Environmental Effects component is weighted one-half because we consider Environmental Effects to make a smaller contribution to Pollution Burden than Exposures do.
- To get the CalEnviroScreen score we multiply the Pollution Burden score by the Population Characteristics score.