As heat waves become more dangerous, public health officials need to know where the threat is greatest. Vast heat, health, and demographic datasets already exist, collected from satellites, sensors, forecasts, and censuses. During a heat wave complicated by wildfire smoke, officials may need to know what happens next, and where, Balsari added. Users can view different heat measures, including air temperature, heat index, wet-bulb globe temperature and the Universal Thermal Climate Index (UTCI) – a measure of how the human body responds to the environment. The Heat Risk Data API will not plant trees or check on vulnerable residents.