The Iranian capital Tehran is at the best of times - one of the most polluted cities on earth.

即使在环境状况最好的时候，伊朗首都德黑兰仍然是世界上污染程度最严重的城市之一。

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The study found that the Mongolian capital Ulan Bator had an annual average PM10s density of 279 micrograms per cubic meter, followed by another west Iranian city, Sanandaj, with 254 micrograms.

研究发现，蒙古首都乌兰巴托年均可吸入颗粒物浓度为每立方米279微克，其后是又一个伊朗西部城市，萨南达杰，浓度为每立方米254微克。

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Up to 100 defendants were reported by Iranian media to be appearing before a court in the capital, Tehran, accused of violence following the 12 June vote.

据伊朗媒体报道，近100名被告出现在首都德黑兰一家法庭，被指控犯有后6.12选举危害罪。

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The rods would be used to power a research reactor in the Iranian capital making medical isotopes.

VOA: standard.2009.10.21

The bombs exploded within minutes of each other, two in the Mansur district, a diplomatic area in western Baghdad, the third near the Iranian embassy in the center of the capital.

VOA: standard.2010.04.04

The route includes stopovers in Quetta, near the Afghan border, and in the Iranian capital, Tehran.

BBC: Birmingham to Pakistan bus route launch delayed

At Tuesday's news conference in the Iranian capital, Tehran, Mehmanparast said his country needs nuclear fuel from the plants to meet its long-term energy needs, to move toward self-sufficiency.

CNN: U.S.: Time running out for Iran

Turkey's prime minister, Recep Tayyip Erdogan, has just been warmly received in the Iranian capital, Tehran, a reflection of the realpolitik that has kept links open despite the Islamic Republic's international isolation.

ECONOMIST: Turkey and the Middle East