国产热热热精品,亚洲视频久久】日韩,三级婷婷在线久久,99人妻精品视频,精品九热人人肉肉在线,AV东京热一区二区,91po在线视频观看,久久激情宗合,青青草黄色手机视频

Thick smog grounds flights and fouls air

Updated: 2012-01-11 08:20

By Zheng Xin (China Daily)

  Comments() Print Mail Large Medium  Small

BEIJING - More than 100 flights in Beijing were grounded because of smog at dawn on Tuesday, according to Capital International Airport.

Thick smog grounds flights and fouls air

A resident wearing a mask and sunglasses walks in Beijing, as heavy smog hit the city on Tuesday. Wamg Jing / China Daily

The smog, which delayed 80 flights and canceled 43 by 12 pm, caused a surge of airborne particulate matter in most parts of the city, the Beijing Municipal Environmental Protection Bureau said on its micro blog.

Visibility was reduced to less than 200 meters during rush hours, according to the city's meteorological bureau.

Air quality worsened with the smog, with the US embassy's air pollution index reading 500 at 7 am on Tuesday and its PM2.5 measurement (particulate matter smaller than 2.5 micrometers) reading 513 micrograms a cubic meter.

The embassy issued a health warning of emergency conditions in the morning, saying "all people are more likely to be affected".

According to the Beijing municipal environmental monitoring center, the capital witnessed a rapid increase of inhalable particle density since dawn because of the fog, especially in southeastern and southwestern parts of the city.

The data showed the average Air Pollution Index, based on PM10 data collection, around the US embassy was 212 micrograms a cubic meter, with sulfur dioxide readings reaching 70 and nitrogen dioxide reaching 102. The smog began to disperse as the wind picked up at midday, allowing planes to take off and land, with visibility improving to 2,000 meters around 1 pm, according to airport.

The city's monitoring station started releasing the pollutant density data collected at the 27 stations around the city, including the sulfur dioxide, nitrogen dioxide and PM10 levels.

Since Monday, the station has provided detailed data by area instead of a general figure for the whole city.

In addition, hourly readings of pollutants will soon be issued instead of the daily figure, and data on PM2.5 will be announced before the start of Spring Festival, which falls on Jan 23, the bureau said.

The bureau has also promised to take measures to reduce air pollutants.

"Although the foggy weather keeps the pollutants from dispersing, the PM2.5 readings wouldn't be this high if the city's air were clean enough, however heavy the fog is," said Wang Qiuxia, a researcher at Green Beagle, an environmental protection non-governmental organization based in Beijing.

"The fog is not an excuse."

 

永吉县| 班戈县| 靖江市| 阿尔山市| 嘉义市| 昂仁县| 新郑市| 北票市| 宜宾县| 辽阳县| 东莞市| 临漳县| 内乡县| 体育| 石棉县| 阳原县| 靖安县| 习水县| 馆陶县| 靖江市| 青州市| 綦江县| 廊坊市| 杭州市| 长汀县| 衡东县| 酒泉市| 木兰县| 竹山县| 玉林市| 维西| 交城县| 铁力市| 抚松县| 依安县| 宝应县| 逊克县| 桦川县| 包头市| 怀仁县| 连山|