www射-国产免费一级-欧美福利-亚洲成人福利-成人一区在线观看-亚州成人

US EUROPE AFRICA ASIA 中文
China / Society

Study: PM2.5 kills like smoking

By ZHENG JINRAN (China Daily) Updated: 2015-02-05 03:43

Some experts skeptical of results, say health effects take more time to quantify

Premature deaths related to PM2.5 pollution in 31 major Chinese cities reached 257,000 in 2013, making it a major killer equivalent to smoking, according to a yearlong study released on Wednesday.

The study, conducted by Greenpeace, the environmental protection group, and Peking University's School of Public Health, took each of the 31 major Chinese cities' average PM2.5 concentration and applied a World Health Organization model to estimate health effects.

It focused mainly on four conditions, including lung cancer and stroke, which have been tied to exposure to the fine particulate matter.

The WHO model is authoritative, said Pan Xiaochuan, professor of public health at Peking University and one of the study's authors.

The study said there were around 90 premature deaths for every 100,000 people from PM2.5 pollutants, which are airborne particles smaller than 2.5 microns in diameter that can penetrate the lungs.

That means, for example, that in Beijing, pollution-related deaths would have exceeded 18,000 in 2013.

The rate was higher in heavily polluted cities like Shijiazhuang, Hebei province, and Jinan, Shandong province, the study said, adding that the number of deaths caused by PM2.5 pollution may equal those from smoking.

Some public health experts were skeptical of the claim, saying that because PM2.5 pollution affects human health over time, it may take a decade or two to quantify its effects accurately.

While they shared concerns about PM2.5 pollution's adverse effects on human health, some took issue with the details of the study.

"The country has started to investigate the health effects, but it will take one or two decades to get results based on long-term tracking of some patients," said Zhi Xiuyi, head of the Lung Cancer Diagnosis and Treatment Center of the Capital Medical University.

He said air pollution could exacerbate some diseases, such as those related to the lungs, and lead to delays in recovery, but it's hard to say that PM2.5 pollution was the major factor in a death.

Moreover, some of the 31 used in the study did not release data on PM2.5 in 2013, he said, leading him question the results.

"I think that the results could be inflating the number of deaths related to PM2.5 pollution due to multiple factors," Pan said, although he said it's legitimate to seek understanding about the effects on human health.

Dwight Clark, Medical Director of US-Sino HeartCare in Beijing, said every increase of 5 micrograms per cubic meter of PM2.5 particles means an 18 percent increase in lung cancer.

However, he stressed that no matter what numbers are released from various organizations, the people and governments should notice that air pollution is bad and getting worse.

Highlights
Hot Topics
...
主站蜘蛛池模板: 在线观看国产日本 | 在线观看国产情趣免费视频 | 久久99欧美 | 亚洲精品视频在线观看视频 | 韩国精品视频在线观看 | 美国毛片亚洲社区在线观看 | 中文字幕高清在线天堂网 | 欧美人在线 | 免费高清国产 | 自拍在线视频 | 娇喘嗯嗯~轻点啊视频福利 | aa国产 | 国产成人在线视频播放 | 国内久久精品视频 | 九九精品免费 | 好吊操这里只有精品 | 欧美日韩亚洲在线观看 | 免费看孕妇毛片全部播放 | 日本人一级毛片视频 | 日韩欧美在线观看一区 | 一级毛片免费视频观看 | 亚洲国产精品成人精品软件 | 在线不卡一区 | 欧美在线做爰高清视频 | 爱爱爱久久久久久久 | 在线播放成人高清免费视频 | 成人综合在线视频免费观看 | bt天堂国产亚洲欧美在线 | 久久精品国产大片免费观看 | 怡红院宜春院 | 高清不卡日本v在线二区 | 99精品在线播放 | 国产精品一 | 那里有黄色网址 | 欧美一级v片| 小草青青神马影院 | 国产一级特黄aaa大片 | 久久99精品综合国产首页 | 中文字幕在线看片成人 | 波多野结衣在线观看高清免费资源 | 亚洲精品色综合色在线观看 |