China has reportedly built the biggest air purification tower in the world, standing at 100 metres (328 feet).
據(jù)報(bào)道，中國建造了世界上最大的空氣凈化站，高達(dá)100米。

This is particularly good news as China is the world's deadliest nation for outdoor air pollution, according to the World Health Organisation (WHO).
世界衛(wèi)生組織說，這對(duì)中國來說尤其合適，中國是最需要治理空氣污染的國家。

Another report by WHO warns that air pollution is the biggest environmental risk to health, responsible for one in nine deaths annually worldwide and killing around 3 million each year. This is only getting worse.
世界衛(wèi)生組織發(fā)出警告，空氣污染對(duì)健康的危害最大，全球每年死亡率達(dá)九分之一，因?yàn)榭諝馕廴舅劳龅娜藬?shù)年均三百萬。而且空氣污染日益嚴(yán)重。

In the northern Chinese city of Xian, there is some hope. Here, the experimental tower is having a positive effect on air quality in the area, reports the South China Morning Post.
但是在西安，這種中國北方城市，希望猶存?！赌先A早報(bào)》說實(shí)驗(yàn)站確實(shí)改善了空氣質(zhì)量。

Cao Junji, who leads the research on the tower, told the paper:

The tower has no peer in terms of size...

The results are quite encouraging.

實(shí)驗(yàn)站的負(fù)責(zé)人曹軍驥告訴《南華早報(bào)》：“我們的實(shí)驗(yàn)站是目前世界上規(guī)模最大的……帶來的效果令人欣喜?！?/div>

He said initial results looked good, with the tower pumping out 10 million cubic metres (353 million cubic feet) of clean air per day since it was launched last year.
他說初步結(jié)果還不錯(cuò)，實(shí)驗(yàn)站去年啟動(dòng)，每天釋放一千萬立方米的潔凈空氣。

On days where pollution reached critical levels, which more frequently happens in winter when Xian relies heavily on coal, the purifying tower brought it down to a moderate level. PM2.5 - the fine particles in smog that are most harmful to health - fell 15 per cent during heavy pollution on average.
每年冬天，西安要用煤，污染常常在此時(shí)達(dá)到峰值，當(dāng)時(shí)凈化站使峰值回落到常態(tài)。霧霾中的細(xì)小顆粒PM2.5對(duì)健康影響最大，在重度污染的情況下，下降了15%。

But Junji pointed out that results aren't conclusive and testing is still ongoing.
但是軍驥說結(jié)果還不能最終確定，仍需測(cè)試。

The purifying system works by pulling the air inside greenhouses at the base of the tower and heating it via solar energy. The hot air then rises through the tower, passing through layers of cleaning filters.
凈化系統(tǒng)的工作原理是先把空氣吸入實(shí)驗(yàn)站底部的溫室，通過太陽能加熱，熱空氣上升至站頂，通過層層凈化器后排出。

（翻譯：阿忙）