世衛(wèi)組織是聯(lián)合國(guó)系統(tǒng)內(nèi)衛(wèi)生問題的專門機(jī)構(gòu)，希望更有效地監(jiān)控全球空氣質(zhì)量,。而要切實(shí)推動(dòng)空氣質(zhì)量改善,，就得了解空氣污染如何影響全球人口。因此,，世衛(wèi)組織新近的報(bào)告既評(píng)估了各國(guó)的空氣污染程度,，也評(píng)估了由此導(dǎo)致的各種疾病，包括致死率,。

研究表明,，亞洲中部國(guó)家空氣污染最嚴(yán)重，中國(guó)并沒有排第一,，而是在埃及,、土庫(kù)曼斯坦、塔吉克斯坦,、烏茲別克和阿富汗之后,，名列第六。美聯(lián)社報(bào)道稱,，世衛(wèi)組織的空氣污染水平排名由空氣污染導(dǎo)致死亡人數(shù)而定,，死亡人數(shù)最多的四個(gè)國(guó)家是空氣污染防治最不力的國(guó)家。

《紐約時(shí)報(bào)》稱,，雖然不少人認(rèn)為中國(guó)空氣污染非常嚴(yán)重,，但北京大學(xué)此前的一項(xiàng)研究認(rèn)為，過去三年,，北京和香港等五大城市的顆粒物水平——衡量空氣中有毒物質(zhì)含量的指標(biāo)實(shí)際上有所下降,。

世衛(wèi)組織報(bào)告稱，全球92%的人口生活在空氣污染程度不符合健康標(biāo)準(zhǔn)的地區(qū)。這意味著,，全球每十人之中就有不只九人生活在空氣污染超標(biāo)的環(huán)境中,，貧困國(guó)家的情況還更嚴(yán)重。

“將近90%的空氣污染致死案例發(fā)生在低收入和中等收入國(guó)家,，且近三分之二在世衛(wèi)組織劃定的東南亞區(qū)域和西太平洋區(qū)域,。” 世衛(wèi)組織如此下結(jié)論,。

汽車尾氣,、發(fā)電廠、垃圾焚燒,，垃圾填埋排放和養(yǎng)殖家畜都是室外空氣污染的來源,。世衛(wèi)組織認(rèn)為，各種污染源給人類造成嚴(yán)重的健康問題,，如肺癌,、肺病、心臟病和中風(fēng),。這些疾病都有可能致命,，在高質(zhì)量醫(yī)療護(hù)理極為有限的低收入國(guó)家，空氣污染致死比例尤其高,。

世衛(wèi)組織稱,，每年約有300萬例死亡與室外空氣污染有關(guān)。僅2012年,，約有650萬例死亡與空氣污染有關(guān),，約占當(dāng)年全球死亡人數(shù)的11.6%。

世衛(wèi)組織將空氣污染定性為 “當(dāng)今世界面臨的最大環(huán)境健康威脅,?！笨諝馕廴灸壳坝绊懗^80%的城市居民，每年導(dǎo)致至少700萬人喪生,。（財(cái)富中文網(wǎng)）

譯者：Pessy

審校：夏林

The agency, which is a specialized division of the United Nations, wants to better monitor the world’s air quality. But in order to make improvements, it needs to understand how air pollution affects the global population. So the latest report evaluates both the level of exposure in certain countries and the resulting burden of disease each country carries, including death.

Turns out, air pollution is highest in Central Asian countries, but not the one you might think: China ranks in sixth place, trailing behind Egypt, Turkmenistan, Tajikistan, Uzbekistan, and Afghanistan. Rankings are determined by the number of air pollution-related deaths, with the top four being the worst offenders, according to the Associated Press.

While we associate China with excessive air pollution, an earlier study from Peking University determined that the country’s particulate matter levels—which gauge the amount of toxins in the air—have actually declined over the last three years in five of the nation’s major cities, including Beijing and Hong Kong, according to the New York Times.

Taken together, 92% of the world’s population lives in regions where air quality levels exceed the healthy limit. That’s more than nine out of 10 people, with even worse numbers in poor countries.

“Nearly 90% of air-pollution-related deaths occur in low and middle-income countries, with nearly two out of three occurring in WHO’s South-East Asia and Western Pacific regions,” the WHO concluded.

Vehicle exhaust, power plants, waste burning, landfill emissions, and livestock promotion are all forms of outdoor air pollution. These contribute to serious health problems, like lung cancer, pulmonary disease, heart disease, and stroke, according to the WHO. And these diseases can eventually lead to death, especially in a low-income country where access to quality health care is limited.

About three million deaths a year are linked to outdoor air pollution exposure around the world and an estimated 6.5 million people died from air quality-related health issues in 2012 alone—about 11.6% of all global deaths that year, according to the WHO.

The organization considers air pollution “the single greatest environmental threat we all face.” It now affects more than 80% of people living in cities and kills at least 7 million people each year.