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June 2, 2011

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Home » Metro » Public Services

Expo system provides haze alert

SHANGHAI'S weather authority yesterday issued its first haze alert using equipment bought for the World Expo 2010 held in the city.

With an anticyclone over the city, Shanghai's weather is mostly cloudy at the moment with little wind.

Haze appeared early yesterday morning, becoming more serious as humidity increased, according to the Shanghai Meteorological Bureau.

At 9:16am, the bureau issued a yellow haze alert, the second lowest on a four-level scale, as visibility continued to decrease to within 3 kilometers.

The bureau said the alert was to remind locals to drive carefully and avoid spending long periods on outdoor activities.

This was the first time the bureau had issued a haze alert since the alerting system was altered in 2007.

"Haze is hard to distinguish from mist and floating dust conditions," said Zhang Ruiyi, chief service officer of the bureau. "With the equipment purchased last year, we can detect haze more easily and accurately."

In the lead-up to the World Expo, the bureau bought an array of air monitoring equipment to improve observations.

Yesterday's haze was the result of a combination of mist, little wind and heavy humidity, Zhang said. In comparison, severe air pollution at the beginning of last month was caused by particles from sand storms in the north.

The alert was lifted about 4:15pm when winds grew stronger.

The Shanghai Environmental Monitoring Center said air quality in Shanghai yesterday was slightly polluted due to the haze. Air quality was expected to be good today, said the center.


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