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

chinadaily.com.cn
left corner left corner
China Daily Website

High concentration of PM 2.5 in Beijing's air

Updated: 2012-10-08 21:24
By Wang Qingyun ( chinadaily.com.cn)

The average concentration of PM 2.5 in Beijing's air over the past 24 hours has exceeded the limits for "air with acceptable quality", as defined by the Ministry of Environmental Protection's air quality standards.

PM 2.5 refers to particles in the air with less than 2.5 micrometers in diameter, which are believed to pose health risks.

Beijing's environmental monitoring center showed that all the 27 outdoor monitoring stations detected an average concentration of PM 2.5 higher than 100 micrograms per cubic meter from 6 pm yesterday to 5 pm today.

The highest average concentration was 254 mcg/cu, detected by an air monitoring station in Beijing's southwest Fangshan district.

Air quality that is "moderate", or better than that, should contain a 24-hour average concentration of PM 2.5 of no more than 75 mcg/cu, according to air quality standards. Otherwise, the air is deemed "polluted".

An average concentration of more than 250 mcg/cu falls in the category of "severely polluted" air, with people advised against outdoor activities, according to the ministry's standards, which will take effect in 2016.

Air quality is likely to improve tomorrow. The city's meteorological bureau has predicted that a cold air mass will reach the city and bring wind, which will improve conditions.

However, Beijing's air quality is expected to remain lackluster for some time.

"Based on the air quality of Beijing, excessive PM 2.5 concentration will be detected often for a long time to come," Zhao Yue, deputy director of the environmental monitoring center, told Xinhua News Agency on Oct 4.

8.03K
 
...
...
...
主站蜘蛛池模板: 综合精品 | 国产精品亚洲精品日韩已方 | 中文精品久久久久国产网址 | 成人永久福利在线观看不卡 | 在线观看的毛片 | 特级a做爰全过程片 | 国产三级视频网站 | 国产欧美va欧美va香蕉在线观 | 正能量www正能量免费网站 | 久久福利青草精品资源站免费 | 日韩免费观看的一级毛片 | 国产精品国内免费一区二区三区 | 久久综合日韩亚洲精品色 | 成人国产第一区在线观看 | 在线观看国产精品日本不卡网 | 亚洲精品国产福利片 | 9丨精品国产高清自在线看 ⅹxx中国xxx人妖 | 亚洲精品久久99久久一区 | 日韩乱码视频 | 91精品国产福利尤物免费 | 亚洲国产精品自产拍在线播放 | 欧美亚洲国产精品久久高清 | 久久se精品一区精品二区 | 在线精品国产成人综合第一页 | 精品国产一区二区三区不卡蜜臂 | 特黄特黄aaaa级毛片免费看 | 美女综合网 | 欧美日韩亚洲v在线观看 | 91在线免费观看网站 | 国产毛片一级国语版 | 99av在线 | 盗摄偷拍a在线观看 | 欧美aaaaa一级毛片在线 | 成人三级在线观看 | 网站午夜 | 91免费公开视频 | 国产亚洲精品国产第一 | 在线观看va | 国产精品二区在线 | 99久久亚洲综合精品网站 | 久久久精品久久视频只有精品 |