在线国产一区二区_成人黄色片在线观看_国产成人免费_日韩精品免费在线视频_亚洲精品美女久久_欧美一级免费在线观看

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

Ozone could turn cities into no-go zones

By Zheng Jinran | China Daily | Updated: 2017-04-07 06:50
Share
Share - WeChat

The invisible pollutant is rapidly becoming a main cause for concern in many areas of China, as Zheng Jinran reports.

After the heavy, prolonged smog that often shrouds China during winter, the return of blue skies in spring and summer is always welcome.

However, sunny summer days may not be as beneficial as one might imagine: instead, people may become unwell as a result of rising concentrations of ground-level ozone, an invisible airborne pollutant.

At street level, ozone, a type of oxygen formed with an extra molecule, is created when vehicles, power plants, industrial boilers, refineries and chemical factories emit pollutants that react chemically in strong sunlight.

When Li Hui was affected by ozone pollution after working outside for long hours on sunny summer days, she had no idea what was causing her sore throat and dry eyes. "I didn't have a cold, but I coughed a lot," she said. "Sometimes, my mother had similar problems."

The 31-year-old from the northern port city of Tianjin only realized the cause of her mysterious cough when she received a health alert from a smartphone app that measures air quality. The alert said the pollution level was medium and the main pollutant was ground-level ozone.

"A friend, a physician who specializes in pulmonary conditions, told me the problem had probably been triggered by breathing ozone when the level was excessive, usually on hot summer days," Li said.

The doctor's assumption was supported by Lyu Mengyao, an environmental engineer with the China Meteorological Administration, who said ground-level, or "bad", ozone is different to stratospheric, or "good", ozone, which is found in a band that stretches from about 15 kilometers above the surface of the Earth to roughly 35 km.

According to Lyu, breathing high concentrations of ozone can result in a range of health problems, including chest pain, coughing and irritation of the airways. It can also harm lung tissue and worsen the effects of bronchitis, emphysema and asthma, leading to increased need for medical attention.

Many provinces have noticed the growing risk from ozone pollution. In response, they have issued early warnings, similar to the practice adopted to tackle PM2.5, hazardous fine particulate matter with a diameter of less than 2.5 microns, which has been the main target in the battle against pollution for several years.

For example, the Shanghai Meteorological Service has set up a two-tier warning system-with yellow and orange alerts-for ozone pollution. It also recommends the suspension of outdoor activities and a reduction in the use of vehicles during periods of severe saturation.

1 2 Next   >>|
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: 日韩毛片网 | 五月天久草 | 国产91网址 | 国产欧美精品 | 久久精品123 | 极品视频在线 | 国产一区二区三区精品久久久 | 成人二区| 蜜桃视频精品 | 91麻豆精品国产91久久久资源速度 | 成人不卡在线 | 久久婷婷成人综合色 | 精品一区二区三区在线视频 | 色偷偷噜噜噜亚洲男人 | 日韩一区二区三区视频在线观看 | 欧美成人精品h版在线观看 日韩激情影院 | 成人在线www | 盗摄精品av一区二区三区 | 亚洲精品久久久久久国产精华液 | 久久888| 日韩一区二区三区在线视频 | 久久久精品一区二区三区 | 国产精品成人在线 | 欧美亚洲国产一区二区三区 | 国产天堂一区二区 | 欧美视频一区二区三区四区 | 国产成人一区 | 精品一二三区视频 | 日韩精品一区二区在线观看 | 亚洲va中文字幕 | 国产成人免费 | 久久亚洲一区二区三区四区 | 手机看片福利一区 | 99精品国产99久久久久久97 | 亚洲人人草 | 国产在线二区 | 亚洲国产高清视频 | 成人在线免费视频 | 国产精品久久久久久婷婷天堂 | 色丁香在线 | 亚洲电影在线看 |