www射-国产免费一级-欧美福利-亚洲成人福利-成人一区在线观看-亚州成人

Beijing begins PM2.5 measure of air quality

Updated: 2012-01-21 15:56

(Xinhua)

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

BEIJING - Beijing's environment authority on Saturday launched the much-anticipated PM2.5 measure of air quality, fulfilling its promise of publishing the data ahead of the Spring Festival holiday, which starts on Sunday.

The Beijing Environment Protection Monitoring Center said its monitoring station at the city's second ring road had detected 0.003 micrograms of PM (particular matter) 2.5 per cubic meter, suggesting the air quality is good.

The PM2.5 gauge is considered stricter than Beijing's previous standard of PM10, as it monitors "fine" particles 2.5 microns or less in diameter.

A fierce online public debate on PM2.5 and PM10 began at the end of 2011 when it came to light that air-quality monitoring results released by Beijing's weather forecast station and the US Embassy in Beijing often differed.

On Saturday, the embassy's air-quality rating also suggested the air is "good."

Zhao Yue, deputy head of the Beijing Environment Protection Monitoring Center, said cold air from Friday helped blow away "hazardous" pollution persisting in the air due to week-long smoggy weather.

However, he pointed out Saturday's PM2.5 reading can only vouch for air quality in Xicheng district, where the city's only PM2.5 monitoring station was set up.

He said local authorities plan to build a citywide network of PM2.5 monitoring stations by the end of this year.

Zhao did not give the exact number of stations to be built. But the city currently has set up 27 PM10 monitoring stations to provide real-time data covering in the whole city.

Yu Jianhua, an air official with the Beijing Environmental Protection Bureau, said the city government has spent 10 years taking aggressive air pollution control measures, including eliminating heavy-polluting vehicles and using clean energy for heating, in the hope of meeting the national PM10 standard of 100 micrograms per cubic meter of air. However, the average PM10 reading last year still hung at 120 micrograms.

Although the national standard on classifying the PM2.5 reading has yet to come out, public hearings by China's environment ministry earlier this month suggested the future national PM2.5 standard may be set at 35 micrograms per cubic meter of air on average a year.

Yu said PM2.5 on average accounts for less than half of the PM10 concentrations. It means, under the present air-quality conditions, Beijing's average PM2.5 rating could not meet the pending national standard.

He said research showed that 50 percent of the total PM2.5 particles in the air are contributed by automobile exhausts, and another 23 percent are brought by floating dust.

Beijing's geological situation means that air pollution is likely. The city sits in a plain area surrounded by mountains in three sides, Yu explained.

He said the municipal government has laid down a series of measures to tighten air-pollution control. Among them, a primary target is to introduce a Euro 5 emission standard to replace the current Euro 4 by the end of the year pressuring auto makers to upgrade products to reduce emission discharge.

Beijing has 5 million vehicles on road, meaning urban traffic is very congested. Experts say vehicle emissions contain more fine particles when automobiles drive at low speed.

主站蜘蛛池模板: 免费观看的毛片手机视频 | 久久人 | 欧美中文字幕在线看 | 日本在线观看网址 | 蕾丝视频永久在线入口香蕉 | 一级做a爱过程免费视频麻豆 | 亚洲美女综合 | 一区高清| 日韩三级黄色片 | 久久在线 | 女人张腿让男桶免费视频网站 | 久久国产夜色精品噜噜亚洲a | 亚洲综合99 | 亚洲成成品网站有线 | 国产日本在线 | 国产毛片一区二区三区精品 | 日本 亚洲 欧美 | 毛片在线高清免费观看 | 久久久亚洲国产精品主播 | 特级aa一级欧美毛片 | 亚洲欧美视频在线播放 | 日韩欧美一区二区三区不卡视频 | 国产午夜亚洲精品理论片不卡 | 真人毛片视频 | 99久久精品国产一区二区成人 | 国产日韩精品视频 | 精品国产自 | 在线免费一级片 | 欧美激情视频在线观看一区二区三区 | 在线a网站 | 国产精品久久国产精品99盘 | 国产二区精品 | 72种姿势欧美久久久久大黄蕉 | 亚洲国产精品成人精品软件 | 国语自产精品视频 | 在线播放国产一区二区三区 | a毛片久久免费观看 | 成人午夜精品久久不卡 | 一级片欧美 | 欧美在线观看免费一区视频 | 一级毛片在线免费视频 |