A Beijing environment official said Sunday that hot and humid weather contributed to the recent low air visibility in Beijing and the city would see clearer sky soon with weather cooling down.

"Beijing is usually very humid in summer and sees quite some misty days, which also causes low visibility," Du Shaozhong, vice director of Beijing Municipal Environmental Protection Bureau, said at the press conference.

Beijing's recent hazy sky has become a concern to many people. Many are wondering whether it is pollutants that blurred the sky.

Du said both pollutants and whether condition could affect air visibility. "We have spent great efforts cutting pollutants and seen obvious improvement of air quality. As for visibility, no matter in which country, visibility is low in misty days."

The official is optimistic that Beijing's air quality will improve as weather changes.

"August seventh is the day when autumn begins (according to the Chinese lunar calendar). The weather in autumn is fine and autumn is usually the best season for traveling and having meetings in Beijing. I believe air quality during the Olympics will be fine," he said.

Since 1998 to 2007, Beijing has carried on large scale air pollution prevention and control work.

Since winning the Olympic bid in 2001, Beijing has strived to reduce the four main pollutants, namely sulfur dioxide, nitrogen dioxide, carbon monoxide and particulate matter, by 60.8 percent, 39.4 percent, 10.8 percent and 17.8 percent, respectively.

In the first half of 2008, the major pollutants have dropped by 20 percent and small particulate matter reduced by 7 percent.

To further cut pollutants and ease traffic congestion, from July 20, private cars have been stopped on alternate days according to their odd or even number license plates. The vehicle restrictions have resulted in a 20 percent drop of major air pollutants, according to the municipal government.

Du admitted that the so called extreme weather conditions like these days are not favorable on the control of the pollutants.

"On that extreme weather conditions, we will take tougher control measures to guarantee the air quality. We are on the right track of air quality control," he said, without giving details of the back-up plans.

(Xinhua News Agency July 27, 2008)