Scoring & Model

What is the CalEnviroScreen Model?

 
The CalEnviroScreen 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 7 Population Characteristics indicators.

Pollution burden is exposures and environmental effects. Population characteristics are sensitive populations and socioeconomic factors.

How is CalEnviroScreen scored?

  • Each census tract receives scores for as many of the 19 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.
  • The Population Characteristics score for a census tract is the average of the percentiles for all the Sensitive Populations indicators and Socioeconomic Factors indicators for that census tract.
  • The Pollution Burden score is the average of the percentile scores from Environmental Effects and Exposures indicators.
  • The Environmental Effects indicator percentiles are divided in half because we consider environmental effects to make a smaller contribution to pollution burden than exposures do.

List of CalEnviroScreen 2.0 indicators
  • To get the CalEnviroScreen score we multiply the Pollution Burden score by the Population Characteristics score.

Pollution burden indicators are multiplied by the population characteristic indicators to come up with the CalEnviroScreen score.