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Datasets used in methodology

Low income

Percent of a census tract's population in households where household income is at or below 200% of the federal poverty level.

Expected agriculture loss rate

Percent of agriculture value at risk from losses due to natural hazards. Calculated by dividing the agriculture value at risk in a census tract by the total agriculture value in that census tract. Fourteen natural hazards that have some link to climate change include: avalanche, coastal flooding, cold wave, drought, hail, heat wave, hurricane, ice storm, landslide, riverine flooding, strong wind, tornado, wildfire, and winter weather.

Expected building loss rate

Percent of building value at risk from losses due to natural hazards. Calculated by dividing the building value at risk in a census tract by the total building value in that census tract. Fourteen natural hazards that have some link to climate change include: avalanche, coastal flooding, cold wave, drought, hail, heat wave, hurricane, ice storm, landslide, riverine flooding, strong wind, tornado, wildfire, and winter weather.

Expected population loss rate

Rate relative to the population in fatalities and injuries due to natural hazards each year. Fourteen natural hazards that have some link to climate change include: avalanche, coastal flooding, cold wave, drought, hail, heat wave, hurricane, ice storm, landslide, riverine flooding, strong wind, tornado, wildfire, and winter weather. Population loss is defined as the Spatial Hazard Events and Losses or National Centers for Environmental Information’s (NCEI) reported number of fatalities and injuries caused by the hazard occurrence. To combine fatalities and injuries for the computation of population loss value, an injury is counted as one-tenth (1/10) of a fatality. The NCEI Storm Events Database classifies injuries and fatalities as direct or indirect. Both direct and indirect injuries and fatalities are counted as population loss. This total number of injuries and fatalities is then divided by the population in the census tract to get a per-capita rate of population risk.

Energy cost burden

Average annual energy cost ($) divided by household income.

PM2.5 in the air

Fine inhalable particles, with diameters that are generally 2.5 micrometers and smaller.

Diesel particulate matter exposure

Mixture of particles that is part of diesel exhaust in the air.

Traffic proximity and volume

Count of vehicles (average annual daily traffic) at major roads within 500 meters, divided by distance in meters (not km).

Housing cost burden

The percent of households in a census tract that are both earning less than 80% of HUD Area Median Family Income by county and are paying greater than 30% of their income to housing costs.

Lead paint

Percent of housing units built pre-1960, used as an indicator of potential lead paint exposure in tracts with median home values less than 90th percentile

Low median home value

Median home value of owner-occupied housing units in the census tract.

Proximity to hazardous waste facilities

Count of hazardous waste facilities (Treatment, Storage, and Disposal Facilities and Large Quantity Generators) within 5 km (or nearest beyond 5 km), each divided by distance in kilometers.

Proximity to National Priorities List (NPL) sites

Count of proposed or listed NPL - also known as superfund - sites within 5 km (or nearest one beyond 5 km), each divided by distance in kilometers.

Proximity to Risk Management Plan (RMP) facilities

Count of RMP (potential chemical accident management plan) facilities within 5 km (or nearest one beyond 5 km), each divided by distance in kilometers.

Wastewater discharge

Risk-Screening Environmental Indicators (RSEI) modeled Toxic Concentrations at stream segments within 500 meters, divided by distance in kilometers (km).

Asthma

Weighted percent of people who answer “yes” to both of the following questions: “Have you ever been told by a doctor, nurse, or other health professional that you have asthma?” and the question “Do you still have asthma?”

Diabetes

Weighted percent of people ages 18 years and older who report having ever been told by a doctor, nurse, or other health professionals that they have diabetes other than diabetes during pregnancy.

Heart disease

Weighted percent of people ages 18 years and older who report ever having been told by a doctor, nurse, or other health professionals that they had angina or coronary heart disease.

Low life expectancy

Average number of years of life a person who has attained a given age can expect to live.

Note: Unlike most of the other datasets, high values of this indicator indicate low burdens. For percentile calculations, the percentile is calculated in reverse order, so that the tract with the highest median income relative to area median income (lowest burden on this measure) is at the 0th percentile, and the tract with the lowest median income relative to area median income (highest burden on this measure) is at the 100th percentile.

Low median Income

Median income of the census tract calculated as a percent of the area’s median income.

Linguistic Isolation

The percent of limited speaking households, which are households where no one over age 14 speaks English well.

Unemployment

Number of unemployed people as a percentage of the civilian labor force

Poverty

Percent of a tract's population in households where the household income is at or below 100% of the federal poverty level.

High school degree achievement rate

Percent (not percentile) of people ages 25 years or older in a census tract whose education level is less than a high school diploma.
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