国产热热热精品,亚洲视频久久】日韩,三级婷婷在线久久,99人妻精品视频,精品九热人人肉肉在线,AV东京热一区二区,91po在线视频观看,久久激情宗合,青青草黄色手机视频

Make me your Homepage
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

 
 
...
轮台县| 微山县| 昭通市| 大港区| 博野县| 库尔勒市| 秦皇岛市| 酒泉市| 遂宁市| 盐城市| 库车县| 沙洋县| 勃利县| 高邑县| 连平县| 万荣县| 凌云县| 稷山县| 云梦县| 囊谦县| 东阳市| 永福县| 西藏| 宜都市| 平利县| 金寨县| 北碚区| 河北省| 双鸭山市| 习水县| 泽普县| 五大连池市| 鸡东县| 手游| 伊川县| 贵定县| 富川| 汾西县| 满洲里市| 唐河县| 内江市|