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

US EUROPE AFRICA ASIA 中文
Business / Air pollution

PM2.5 kills thousands, researchers say

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

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

Hot Topics

Editor's Picks
...
主站蜘蛛池模板: 黄a在线观看 | 亚洲xxxx天美 | 99久久国产精 | 亚洲成网站| 伊人福利 | 亚洲影视网 | 国产三级精品视频 | 日韩www| 免费看一级黄色 | 国产精品.www | 国产精品成人在线观看 | 五月婷婷狠狠爱 | 91九色在线观看 | 久久精品伦理 | 欧美专区第一页 | 91成人福利 | 日本在线精品 | 国产视频在线一区 | 香蕉久久久久久 | 国产三级91 | 日韩亚洲一区二区三区 | 国产高潮呻吟久久久 | 欧美一区二区在线播放 | 久久精品成人一区二区三区蜜臀 | 日本少妇久久 | 亚洲午夜精品久久久 | 青青青手机视频在线观看 | 欧美黄色a级片 | 日本精品视频一区二区三区 | 国产视频一级 | 中文字幕在线观看不卡 | 肉感丰满的av演员 | 日韩大片在线 | 欧美一区免费看 | 亚洲精品91 | 亚洲精品视频久久 | 免费黄色网址大全 | 小柔的淫辱日记(h) 玖玖精品 | 精品福利一区 | 麻豆av一区 | av青草 |