What is the sign of smog?

1. The symbol of smog is the Chinese character "Haze", which is classified by ∞ symbol and color. The levels of smog forecast correspond to moderate smog, severe smog and severe smog respectively, that is, the warning levels of smog from low to high are yellow, orange and red respectively.

2. Haze is a combination of fog and haze. Smog is very common in cities. In many areas of China, fog and haze are combined as disastrous weather phenomena for early warning and forecasting, which are collectively called "haze weather".

For more information about smog symptoms, please visit:/ask/e 71d1516101233.html? Zd view more content