综合一区欧美国产,99国产麻豆免费精品,九九精品黄色录像,亚洲激情青青草,久久亚洲熟妇熟,中文字幕av在线播放,国产一区二区卡,九九久久国产精品,久久精品视频免费

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
庐江县| 会理县| 乌恰县| 安义县| 隆林| 洛隆县| 沙湾县| 玉树县| 崇仁县| 政和县| 通化市| 囊谦县| 凌云县| 吉水县| 鹤峰县| 朝阳市| 宜君县| 涪陵区| 牡丹江市| 若尔盖县| 凤山市| 宁津县| 建水县| 亚东县| 陇南市| 和田市| 商南县| 体育| 金昌市| 克拉玛依市| 花垣县| 金门县| 太白县| 米易县| 广州市| 乌兰察布市| 宁陕县| 淅川县| 河东区| 增城市| 班玛县|