日韩精品久久一区二区三区_亚洲色图p_亚洲综合在线最大成人_国产中出在线观看_日韩免费_亚洲综合在线一区

Global EditionASIA 中文雙語Fran?ais
China
Home / China / Environment

Pollution? Blame uptick in production

By HOU LIQIANG | China Daily | Updated: 2018-04-03 07:34
Share
Share - WeChat

Meteorological conditions conspire to keep smog from moving out of region

Beijing's iconic Central Business District is barely visible on March 28, 2018. [Photo/VCG]

Unfavorable meteorological conditions and more pollutants spewed from factories whose production restrictions were lifted after the heating season are to blame for the recent extended haze in the Beijing-Tianjin-Hebei region, experts said.

Beijing issued a blue alert for air pollution on Sunday and Monday. It was the third air pollution alert for the city in about 20 days. An orange alert for air pollution was issued twice in March.

Under China's four-tier alert system, red is the most severe, followed by orange, yellow and blue.

Emissions of air pollutants in the region remain high, with the dominance of heavy industry and chemical manufacturing, according to the National Joint Research Center on Air Pollution Causes and Control.

"Though air pollutant emissions from heating have decreased a lot after the heating season ended in the Beijing-Tianjin-Hebei cluster, many of the companies whose production was restricted have resumed normal operations, resulting in an obvious increase in air pollutants from industrial sources," the center concluded, based on expert analysis.

Air pollution is especially severe during the heating season in the Beijing-Tianjin-Hebei region because of the use of coal. While the region has replaced a great deal of coal with clean energy, it also resorted to production restrictions during the season to curb emissions.

In Hebei province, for example, steel factories in some cities are restricted to half capacity during the season. Additionally, the operations of all companies listed as polluting the air are also restricted or suspended during times when atmospheric conditions contribute to the accumulation of heavy pollution.

The regular heating season in the Beijing-Tianjin-Hebei region runs from Nov 15 to March 15. This year, heating supplies were extended to March 20 for some cities because of cold weather.

The statement said part of the reason for the frequent bouts of air pollution is that meteorological conditions turned unfavorable for dispersal, which is common as the season shifts to spring.

One of the main reasons for the frequent smog after March is unfavorable meteorological conditions that feature a stable atmosphere and high humidity, said Ma Xuekuan, chief forecaster at the National Meteorological Center.

He said the number of days with meteorological conditions that feature low wind, high humidity and temperature inversions-which prevent normal convective churn of the atmosphere-increased from nine days last year to more than 20 days this year during the same period.

Even as temperature inversions have made the vertical dispersal of pollutants difficult, low wind speeds have prevented horizontal dispersal, he said. Meanwhile, the high humidity in the ground layer of the atmosphere is favorable for the concentration of PM2.5.

He said pollution that has blown in from nearby regions has also worsened the situation.

Top
BACK TO THE TOP
English
Copyright 1995 - . All rights reserved. The content (including but not limited to text, photo, multimedia information, etc) published in this site belongs to China Daily Information Co (CDIC). Without written authorization from CDIC, such content shall not be republished or used in any form. Note: Browsers with 1024*768 or higher resolution are suggested for this site.
License for publishing multimedia online 0108263

Registration Number: 130349
FOLLOW US
 
主站蜘蛛池模板: 亚洲国产免费 | 亚洲色域网 | 五月婷婷丁香 | 奇米影视小说 | 亚洲综合色视频在线观看 | 久久国产资源 | 521国产精品视频 | 视频在线一区二区 | 婷婷五月色综合香五月 | 国产成人www | h小视频在线观看网 | 欧美成视频在线观看 | 久久亚洲精品国产精品黑人 | 嫩草影院ncyy在线观看 | 91网站在线看 | 精品欧美一区二区在线观看欧美熟 | 黄色 在线播放 | 亚洲精品在线视频观看 | 日本美女久久 | 久久草网站 | 成人欧美一区二区 | 国产精品久久久久久久一区探花 | 日本天天操 | 国产精品久久久久久日本 | 五月天综合婷婷 | 香蕉视频在线观看免费 | 不卡视频一区二区 | 成人爽A毛片免费啪啪 | 国产在线观看91一区二区三区 | 亚洲我不卡 | 久草视频福利在线观看 | 亚洲三级国产 | 狠狠色丁香婷婷综合久久片 | 天天舔天天| 中文字幕国产一区 | 日韩在线电影 | 日韩在线成人 | 欧美性猛交一区二区三区精品 | 毛片1毛片2毛片3毛片4 | 欧美老妇交乱视频 | 成人欧美网站免费 |