New government heat risk tool changes the color of the worst level to magenta
Briefly

Magenta signifies the deadliest heat category, indicating rare and prolonged extreme heat with minimal cooling relief, surpassing the major risk level of red. The color-coded system extends from pale green (low risk) to orange (moderate risk) based on specific medical and meteorological factors.
The heat warning system is structured similarly to the hurricane scale, with five levels based on strict numerical thresholds tailored to each location, offering a proactive approach to anticipate and manage varying heat risks.
Read at Fast Company
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