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

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

8.03K
 
...
...
...
主站蜘蛛池模板: 老美AA片 | 国产欧美日韩亚洲精品区2345 | 欧美一区二区三区在线观看视频 | 看特级毛片| 美国一级特色大黄 | 欧美性色生活片免费播放 | 一级视频免费观看 | 久久一级视频 | 一级毛片在线看在线播放 | 成人中文字幕在线 | 亚洲在线视频播放 | 亚洲欧美国产一区二区三区 | 日本一区视频 | 精品国产不卡一区二区三区 | 国产网站在线 | 国产99一区二区 | 精品无人区一区二区三 | 成人国产网站 | 99久久99 | 一级一片在线播放在线观看 | 国产一级黄色网 | 国产精品久久久久久52AVAV | 视频福利在线观看 | 亚洲 欧美 日韩中文字幕一区二区 | 亚洲v日韩v综合v精品v | 一级黄色一级片 | 欧美一二三区在线 | 久久综合九色综合欧美狠狠 | 夜操| 小视频网址 | 91久久亚洲精品一区二区 | 色噜噜狠狠狠狠色综合久 | 久久久久亚洲精品 | 猛草视频| 一级片观看 | 日韩久久综合 | 欧美日韩一区二区三区在线观看 | 欧美日韩亚洲一区 | 国产三级在线 | 国产免费高清无需播放器 | 国产日韩一区二区三区 |