久久亚洲国产成人影院-久久亚洲国产的中文-久久亚洲国产高清-久久亚洲国产精品-亚洲图片偷拍自拍-亚洲图色视频

Beijing reaches annual 'blue sky days' target

Updated: 2011-12-19 09:29

(China Daily)

  Comments() Print Mail Large Medium  Small 分享按鈕 0

BEIJING - As of Saturday, Beijing had enjoyed 274 days of "blue sky" in 2011, fulfilling its annual target ahead of schedule, an official at the city's environmental protection bureau said on Saturday.

Beijing experienced an overall decline in the concentration of various pollutants in 2011, said Zhuang Zhidong, deputy director of the bureau.

The concentration of PM10, or particulate matter of less than 10 micrometers, decreased to 114 micrograms a cubic meter this year, the lowest in four years, according to the bureau.

The city's overall air quality was better than last year, with 22 more days of Grade I air quality, Zhuang said.

Beijing uses a five-grade classification of air quality on the basis of pollution indices, with Grade I being the best and Grade V the worst.

Days with Grade I or II air quality are considered "blue sky days."

However, Beijing also experienced several days of poor air quality as a result of adverse weather. Factors such as weaker winds and a rise in humidity are unsuitable for the dispersal of atmospheric pollutants, according to the bureau.

The bureau has been closely monitoring construction sites and coal-fired boilers in order to reduce emissions of pollutants since the city began supplying heat in mid-November.

Air quality monitoring in Beijing made headlines recently due to public debate over different standards of measurement.

China currently uses PM10 to measure air quality, but the public has urged government authorities to apply the tighter PM2.5 standard, which measures finer matter that is considered more hazardous to human health as it can go deeper into the lungs.

The Ministry of Environmental Protection said it has been reviewing the standards.

It said that a new index standard, which would include PM2.5 and ozone density, is scheduled to be fully implemented nationwide in 2016, with pilot projects in certain regions ahead of the national deadline.

Zhuang said the Beijing Environment Monitoring Center is making preparations to monitor PM2.5 levels, including buying equipment, establishing monitoring posts and training staff.

Xinhua

Related Stories

Big challenges for blue-sky days 2007-01-23 07:18
'Blue sky' target fulfiled 2006-12-25 09:47
Nothing but 'blue skies' from now on 2008-08-20 06:57
Beijing warned of 'blue sky' crisis 2006-05-30 15:10
主站蜘蛛池模板: 国产一区二区三区四区五区tv | 国产欧美一区二区精品性色 | 高级毛片| 日本精品1在线区 | 亚洲一区二区三区免费观看 | 亚洲日韩精品欧美一区二区 | 黄色片亚洲 | 欧美一级大片免费看 | 成人午夜大片免费7777 | 免费看特级毛片 | 97免费在线 | 中文字幕亚洲综合久久 | 韩国免费毛片 | 日韩精品视频一区二区三区 | 91视频一88av | yellow中文字幕久久网 | 收集最新中文国产中文字幕 | 99国产精品免费观看视频 | 国产一级高清视频 | 夜色综合 | 日本一区二区三区高清福利视频 | 精品国产品国语在线不卡丶 | 高清不卡毛片 | 高清国产美女一级a毛片 | www.亚洲精品| 色综合亚洲七七久久桃花影院 | 老色歌uuu26 老师张开腿让我爽了一夜视频 | 日韩精品久久一区二区三区 | 免费看欧美毛片大片免费看 | 国产成人精品综合在线 | 欧美中文字幕在线视频 | 国产亚洲精品一区二区三区 | 久久久亚洲国产精品主播 | 91久久国产综合精品女同国语 | 99国产精品热久久久久久夜夜嗨 | 亚州在线播放 | 手机看福利片 | 亚洲成人免费 | 久久精品中文字幕一区 | 日本一级特黄毛片高清视频 | 精品久久网站 |