Tianjin, Beijing and several provinces in China were affected by thick, dense sandstorms that severely affected visibility.
Tianjin had sand weather on March 22. According to observations, the city's PM10 has increased significantly since 6AM yesterday, the peak concentration has exceeded 2,000 micrograms / cubic meter, the minimum visibility is less than 1 kilometer, and some areas have reached the level of sandstorms, which is the most serious sand and dust storm process affecting Tianjin this year.
The Central Meteorological Observatory issued yellow warning signals from Wednesday to early morning Thursday for Shaanxi, Shanxi, Hebei, Heilongjiang, Jilin, Liaoning, Shandong, Henan, Jiangsu, Anhui and Hubei provinces.
Many area have low visibility, weather forecasters, cautioning drivers on speed. Sandstorms would gradually move south and then weaken.
China has a four-tier, colour-coded weather-warning system, with red representing the most severe warning, followed by orange, yellow and blue.
Beijing, which was also issued a yellow sandstorm warning, has experienced sand and dust storms during the past several days, causing pollution levels to drastically increase.
