Beijing sky turned gold and polluted the air to a serious level when the giant sand dust was swept into the capital to the capital.

The air quality index (AQI) in Beijing increased to 324 at 16h today (17 hours in Hanoi), mainly due to large sand and dust, the city government said.

The situation became worse in the evening, with AQI in some areas in the city over 1,300, according to Swiss IQAir application.

The sky of Beijing capital, China turns yellow because of sand dust tonight.

This amount of sand dust is derived from the Inner Mongolia, China and Mongolia, the big winds blown to Beijing.

The amount of sand in the air today is less than in two sandstorms in northern China last month, but the wind speed is greater, making dust moving faster and further.

"I feel unstable at all. This year we went through several sandstorms," said Gary Zi, a 48-year-old Beijing resident working in the financial sector, said.

China spoke annual sandstorms from Mongolian Gobi desert.

Beijing planted millions of green trees to prevent sandstorms, part of the project called "Van Ly Truong Thanh".

"I feel that it is all due to climate change," Xie, another Beijingian said when cleaning up on his motorbike near the Chinese World Trade Center.

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The Chinese capital and surrounding areas suffer from relatively high pollution.