HeatRisk starts with the big picture: climate. Specifically, it asks how the forecasted temperatures compare to the hottest 5% of days for a given location and time of year.

The index presents those findings on a color-coded map: Yellow means global warming made current temperatures 1.5 times more likely; dark red indicates that the current temperatures were five ...

The color-coded maps allows residents to zoom in to specific neighborhoods to see street condition scores on a scale from 1 to 10, with 10 being the best and 1 being the worst.