What is the sign of smog weather on the weather forecast?

Chinese haze characters, plus ∞ symbols and color-coded characters.

To be precise, fog and haze are not the same thing. Fog weather is foggy weather and haze weather is haze weather. There is no smog weather forecast.

The classification items of smog prediction correspond to moderate smog, severe smog and severe smog respectively. That is, the smog warning level is yellow, orange and red from low to high.

The smog weather warning signal icon has a smog character on the upper right and an ∞ symbol on the upper left. At the bottom are colors classified according to warning levels, such as red, yellow and orange.