What color is the warning signal of smog?

Haze warning signal refers to the haze warning information released to the public by the meteorological offices and stations affiliated to the competent meteorological department. There are three levels of smog warning signals, namely, level III (heavier), level II (severe) and level I (particularly severe), which are marked with yellow, orange and red Chinese and English icons respectively. On May 9th, 20 13, Beijing Meteorological Bureau released a message, and revised the four meteorological warning signals of smog, dust, typhoon and road icing in the new edition. The smog warning signal was originally divided into yellow and orange. On the basis of the original warning, the new version adds a red warning, and the grading clauses of the forecast correspond to moderate haze, severe haze and severe haze respectively. That is, the smog warning level is yellow, orange and red from low to high. In addition, PM2.5 has also been introduced as one of the early warning indicators.

During 2065438+2003 65438+28 10, a large range of haze weather occurred in the central and eastern regions of China, resulting in a continuous decline in air quality. In addition to the fog warning, the Central Meteorological Observatory also issued a smog blue warning signal, which is the first time that China has issued a smog warning separately. The visibility of some sections of Beijing has dropped below 500 meters, and the city's air quality has reached "serious pollution".