Data element	Source	Access as	Years covered	Update Freq.	Description
Social Vulnerability Index	CDC	File	2000-present	Approximately every 2 years	Social vulnerability measures community resilience to respond to or recover from threats to public health. The CDC SVI uses Census data for 15 social factors, including poverty, lack of access to transportation, and crowded housing, grouped into four themes. The index ranges from 0 to 1, with higher values indicating more-vulnerable populations.
Gini Inequality Coefficient	ACS	API	2009-present	Every year	Income inequality is the extent to which income is distributed unevenly among a population. The Gini Index is a summary measure where higher values indicate greater inequality; the coefficient ranges from 0 (perfect equality, everyone receives an equal share) to 1 (perfect inequality).
Old Age Dependency Ratio	ACS	API	2009-present	Every year	The Old Age Dependency Ratio compares the size of the senior population (age 65 and over) to the size of the working-age population (18-64) to measure the social and economic impact of age structures. The ratio ranges from zero upwards; the higher the number, the greater the burden of supporting seniors on working people.
Child Dependency Ratio	ACS	API	2009-present	Every year	The Child Dependency Ratio compares the size of the child population (age 17 and under) to the size of the working-age population (18-64) to measure the social and economic impact of age structures. The ratio ranges from zero upwards; the higher the number, the greater the burden of supporting children on working people.
Air Quality Indicator - Ozone (O3)	CalEPA_CES	File	2014 - present	Released every 4 years	Air Quality Indicator - Ozone (O3). Ozone pollution causes numerous adverse health effects, including acute upper and lower respiratory symptoms, reduced lung function, and exacerbation of lung disease. CalEnviroScreen values modeled from summer month maximum-value means for 2012–2014. The values are in parts per million. O3 concentrations in these data range between 0.026–0.068 ppm.
Air Quality Indicator - PM2.5	CalEPA_CES	File	2014 - present	Released every 4 years	Air Quality Indicator - Fine Particulate Matter <= 2.5 μm. PM2.5 includes extremely small particles and liquid droplets that when inhaled can penetrate deep into the lungs causing serious health problems. CalEnviroScreen values modeled from averages of quarterly means for 2012–2014. The values are in micrograms per cubic meter. PM2.5 values in these data range between 2 and 20 micrograms per cubic meter.
Drinking Water Quality Indicator	CalEPA_CES	File	2014 - present	Released every 4 years	The drinking water contaminant indicator considers measured chemical and bacterial contaminant levels; presence of multiple contaminants; and any past water system water-quality violations. CalEnviroScreen data (2005–2013) were aggregated from census blocks to tracts, weighted by population, and the state percentile value for each contaminant and violation type was summed for the overall score. The index ranges from 0 upwards, with higher values indicating greater concentrations of multiple contaminants.
Air Quality Indicator - Asthma ER Visits	CalEPA_CES	File	2014 - present	Released every 4 years	Air Quality Indicator - Age-adjusted rate of ER visits for asthma per 10,000 persons.
Food - Fraction of Population with Low Access	USDA	File	2010-present	Released every 4 years	USDA Food Access Research Atlas data (2015) measure access to healthy and affordable food based on distance thresholds. This indicator estimates the percentage of the census tract population that live beyond 1 mile from the nearest supermarket for urban areas, or 10 miles for rural areas.
Food - Low-Access Tract	USDA	File	2010-present	Released approximately every 4 years	Low food access tract at 1 mile for urban areas or 10 miles for rural areas. The USDA Food Access Research Atlas considers a census tract to have low food access if a significant number (500) or share (>= 33%) of individuals in the tract lives beyond a specific distance from a supermarket, supercenter, large grocery store, or other source of healthy and affordable food.
Housing - Median Year Built	ACS	API	2009-present	Every year	Median year housing units built. Housing quality is affected by a home’s age, maintenance, structure, and design. Poor air quality; lack of insulation; and potential exposure to lead, asbestos, mold, or carbon monoxide are examples of factors associated with negative health outcomes.
Housing - Pct Occupied Units Lacking Plumbing	ACS calculation	API	2009-present	Every year	Percentage of occupied housing units that lack indoor plumbing.
Housing - Pct Occupied Units Lacking Complete Kitchen	ACS	API	2009-present	Every year	Percentage of occupied housing units that lack complete kitchen facilities.
Housing - Pct Occupied Units with No Bedroom	ACS	API	2009-present	Every year	Percentage of occupied housing units with no bedroom.
Housing - Pct Occupied Units with No Vehicle Available	ACS	API	2009-present	Every year	Percentage of occupied housing units with no vehicle available.
Housing - Pct Occupied Units with No Computer [includes Smartphone]	ACS	API	2009-present	Every year	Percentage of occupied housing units with no computing device available; includes smartphone.
Housing - Pct Occupied Units with No Internet Subscription	ACS	API	2009-present	Every year	Percentage of occupied housing units with no internet subscription; includes cellular data.
Population Density	ACS	API	2009-present	Every year	Population density measures the number of persons per geographical area by dividing the total population by the total land area. It varies considerably across urban and rural areas and also across neighborhoods within cities. It is measured in persons per square kilometer.
Pct Hispanic	ACS	API	2009-present	Every year	Percentage of the population who identify as of Hispanic or Latino origin.
Pct Non-Hispanic	ACS	API	2009-present	Every year	Percentage of the population who do not identify as of Hispanic or Latino origin.
Pct American Indian or Alaska Native	ACS	API	2009-present	Every year	Percentage of the population who identify their race as American Indian or Alaska Native.
Pct Asian	ACS	API	2009-present	Every year	Percentage of the population who identify their race as Asian.
Pct Black	ACS	API	2009-present	Every year	Percentage of the population who identify their race as Black or African American.
Pct Native Hawaiian or Other Pacific Islander	ACS	API	2009-present	Every year	Percentage of the population who identify their race as Native Hawaiian or Other Pacific Islander.
Pct Multiple Race	ACS	API	2009-present	Every year	Percentage of the population who identify as two or more races.
Pct White	ACS	API	2009-present	Every year	Percentage of the population who identify their race as White.
Pct Some Other Race	ACS	API	2009-present	Every year	Percentage of the population who identify their race as Some Other Race.
Pct Below 100% of Fed Poverty Level	ACS	API	2009-present	Every year	Percentage of the population with estimated annual income below the Federal Poverty Level.
Pct Below 200% of Fed Poverty Level	ACS	API	2009-present	Every year	Percentage of the population with estimated annual income below 200% of the Federal Poverty Level.
Pct Below 300% of Fed Poverty Level	ACS	API	2009-present	Every year	Percentage of the population with estimated annual income below 300% of the Federal Poverty Level.
Pct HH that receive SNAP	ACS	API	2009-present	Every year	Percentage of households receiving food stamps/SNAP.
Pct HH with limited English	ACS	API	2009-present	Every year	Percentage of households that speak English less than very well.
Pct HS Grad - Age 25 or Over	ACS	API	2009-present	Every year	Educational attainment; estimated percentage of the population age 25 and over who are high school graduates.
Pct Bachelor’s Degree - Age 25 or Over	ACS	API	2009-present	Every year	Educational attainment; estimated percentage of the population age 25 and over who hold a Bachelor’s degree.
Median Household Income	ACS	API	2009-present	Every year	Estimated median annual household income in US dollars. These data range between $6875-$249,597.
Unemployment Rate - Age 16 or Over	ACS	API	2009-present	Every year	Estimated unemployment rate for persons age 16 and older.
Annual Pollutant Data from SCEHSC - Ozone	SCEHSC	File	1998–2009	2016 (All SCEHSC data released at once)	Air Quality Indicator - Ozone (O3)
Annual Pollutant Data from SCEHSC - Nitrogen Dioxide	SCEHSC	File	1998–2009	2016 (All SCEHSC data released at once)	Air Quality Indicator - Nitrogen Dioxide (NO2)
Annual Pollutant Data from SCEHSC - PM2.5	SCEHSC	File	1998–2009	2016 (All SCEHSC data released at once)	μm
Annual Pollutant Data from SCEHSC - PM10	SCEHSC	File	1998–2009	2016 (All SCEHSC data released at once)	Air Quality Indicator - Fine Particulate Matter <= 2.5 μm.
Annual Pollutant data from NASA - Ozone	NASA	File	2000–2016	Approximately every year until 2016
Annual Pollutant data from NASA - PM2.5	NASA	File	2000–2016	Approximately every year until 2016