Corresponding grades of red, orange, yellow and blue

Red, orange, yellow and blue are used to classify security risk levels, and many risk levels will be used.

From high to low, the safety risk level is divided into major risk, large risk, general risk and low risk, which are marked with four colors: red, orange, yellow and blue.

For example, at present, the color of our health code is divided into red, yellow and blue safety grades. Red indicates that high and major risks need to be isolated, yellow indicates that moderate risks need to be isolated at home, and blue or green indicates that low risks do not need to be isolated.