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

US EUROPE AFRICA ASIA 中文
China / Cover Story

Doubts linger over warning system for smog

By Wu Wencong (China Daily) Updated: 2014-03-12 08:29
Doubts linger over warning system for smog

A woman (left) holds in her arm a dog, while both the owner and the puppy wearing protective face masks in Shijiazhuang, Hebei province, on Feb 25, 2014. [Photo/Xinhua]


Wu Wencong reports on the questions being raised over color-coded alerts.

Between Feb 20 and Feb 26, Beijing, Hebei province and its provincial capital Shijiazhuang issued orange alerts, the second-highest level, warning residents about severe air pollution affecting the region.

It was the first time that all three places had issued alerts simultaneously.

However, when the smog that had enveloped more than 1.8 million sq km for almost a week finally lifted, residents of what is known as the Beijing-Tianjin-Hebei cluster were all asking the same question: Why, given the toxic state of the air, was the alert only orange and not red?

A red alert would have signaled a situation so severe that school classes would have been suspended. Moreover, did the emergency measures actually reduce the number of days the area was smog-bound? Some people even asked if the alert had made any difference.

Under guidelines issued by the Environmental Protection Ministry in May, the emergency measures used in the event of severe pollution have four color-coded levels.

The color of the warning issued depends on estimates of the air quality for the following days.

The estimates are based on the concentrations of six types of airborne pollutants, including fine particles, which are translated into an Air Quality Index. The higher this index reading, the higher the level of pollution.

When the alert is blue, the fourth and the lowest level, local governments are obliged to issue a health warning to residents and encourage them to take protective measures. During yellow (third level) or orange alerts, local governments enforce a range of compulsory measures to force local industries to reduce emissions, such as temporarily lowering factories' production capacity.

When the alert is red, meaning the AQI far exceeds safe levels, those compulsory measures are expanded and strengthened, and classes at middle schools, primary schools and kindergartens are suspended.

Previous Page 1 2 3 Next Page

Highlights
Hot Topics
...
主站蜘蛛池模板: 91高端极品外围在线观看 | 男人和女人的做刺激性视频 | 国产精品不卡在线 | 日本成人中文字幕 | 欧美 亚洲 中文字幕 | 亚洲国产精品成人久久 | 日本道综合一本久久久88 | 国产成人a大片大片在线播放 | 欧美国产日本精品一区二区三区 | 亚洲精品第一区二区三区 | 日本免费三级网站 | 亚洲图片视频在线 | 国内精品七七久久影院 | 亚洲综合图片人成综合网 | 91情侣在线偷精品国产 | 亚洲国产欧美在线人成精品一区二区 | 国产精品美女久久福利网站 | 一级毛片在线不卡直接观看 | 寡妇一级毛片 | 精品亚洲一区二区 | 久久免费99精品久久久久久 | 国产精品成人观看视频国产 | 夜色www国产精品资源站 | 色婷婷激婷婷深爱五月老司机 | 亚洲精品区一区二区三区四 | 欧美日韩在线播放一区二区三区 | 国内精品久久久久久久久蜜桃 | 一级毛片免费视频观看 | 欧美一级视| 久草视频在线免费 | 可以免费观看欧美一级毛片 | 在线观看免费av网 | 性配久久久 | 国产欧美视频综合二区 | 亚洲七七久久精品中文国产 | 三区在线视频 | 精品欧美一区二区在线看片 | 国产成年网站v片在线观看 国产成人aa在线视频 | 99ri在线视频 | 国产高清专区 | 亚洲成人www|