日批在线视频_内射毛片内射国产夫妻_亚洲三级小视频_在线观看亚洲大片短视频_女性向h片资源在线观看_亚洲最大网

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

PM2.5 kills thousands, researchers say

Updated: 2012-12-19 02:51
By Wu Wencong ( China Daily)

An estimated 8,572 premature deaths occurred in four major Chinese cities this year due to high levels of PM2.5, a study has found.

The report also said severe air pollution in Shanghai, Guangzhou, Xi'an and Beijing has led to a total economic loss of 6.8 billion yuan ($1.09 billion).

The study released on Tuesday by Peking University's School of Public Health and Greenpeace looked at the health and economic impact of PM2.5, particulate matter smaller than 2.5 micrometers in diameter.

PM2.5 kills thousands, researchers say

A worker with the Zhengzhou Environmental Protection Bureau in Zhengzhou, Henan province adjusts the equipment used to monitor the city's level of PM2.5 on Dec 18, 2012. [Photo/Xinhua]

Modern toxicology research has shown that exposure to PM2.5 can lead to significantly increased death rates due to cardiovascular, cerebrovascular and respiratory diseases, as well as increased cancer risk.

The study, the first of its kind, was based on available data and took into account varying conditions in the four cities, such as temperature and humidity.

In its conclusion, the report states that if the cities can effectively lower PM2.5 levels to meet the World Health Organization's Air Quality Guidelines — 10 micrograms per cubic meter — such deaths would be reduced by more than 80 percent.

Of the four cities, Shanghai had the highest amount of deaths, although its PM2.5 concentration is not the highest, the study found.

"The reason can be very complicated, but this phenomenon corresponds with research in other countries," said Pan Xiaochuan, a professor at the School of Public Health and lead author of the report.

"There are three main factors. First, Shanghai is the most populous city. Second, people from the south and the north have different sensitivities to pollution. Third, PM2.5 in different places has different components whose effects vary."

The methodology adopted by the study is a widely applied standardized method in epidemiological studies of air pollution, authors said.

"A mathematical model was developed based on PM2.5 laboratory monitoring values over the past three to four years in the four cities, as well as statistics from centers for disease control and prevention of deaths and their causes over the same period," said Li Guoxing, a lecturer at the School of Public Health and a co-author.

Previous Page 1 2 Next Page

 
...
...
...
主站蜘蛛池模板: 成人国产精品一区二区 | 成人福利视频在线 | 欧美人妖xxxx | 肉色超薄丝袜脚交一区二区 | 黄色三级在线视频 | 亚洲天堂日本 | 无遮挡av | 午夜啊啊啊 | 午夜激情一区 | 99热国内精品| 蜜臀av一区 | 国产永久免费视频 | 五月综合激情 | 亚洲激情片| 欲妇荡岳丰满少妇岳91白洁 | 亚洲精品91 | 91 久久| 亚洲精品在线视频观看 | 久久久久久久网站 | 日本三日本三级少妇三级66 | 欧美午夜精品一区二区三区 | 欧美日韩在线视频免费 | 永久免费看成人av的动态图 | 人人狠狠 | 中文字幕在线视频一区 | 久久视频免费观看 | 国产乱码精品一品二品 | 亚洲一级片在线播放 | 国产精品欧美一区二区三区 | 免费黄网站在线观看 | 中文字幕中出 | 精品久久久久久久久久久aⅴ | www黄色在线观看 | 国产视频导航 | 麻豆视频在线看 | 中文字幕黄色片 | 激情小说亚洲色图 | 久久久久久久久爱 | av大片免费 | 毛片毛片毛片毛片毛片毛片毛片 | 99久久国产视频 |