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Air quality improves remarkably during Expo

SHANGHAI reported 121 days, or 98.4 percent of the total from May 1 to August 31, of excellent or good air quality, the top two in a five-level scale, meaning Expo visitors enjoyed a blue sky and fresh air, said Shanghai Environmental Protection Bureau today.

The density of major air pollutants, including sulfur dioxide, nitrogen dioxide and small particles, has dropped significantly since the Expo started in early May, setting the best record in many decades.

Air monitoring found sulfur dioxide plunged by 27.6 percent, nitrogen dioxide dropped by 8.9 percent and particles decreased by 13.9 percent from the same period of last year.

Officials said the ban on hey burning is one of the most effective measures the government carried out to improve air quality during the Expo as it is a major cause of air pollution during the harvest from late May to early June and from late October to early November.

Hey burning can generate carbon dioxide, nitrogen oxides and particles, resulting in poor air quality.


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