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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Mr. GARETH SMYTH (Tehran Correspondent, Financial Times, ): Hello.

NPR: Iran Plays to Domestic Audience in Nuclear Talks

According to the Ashgabat arrangement, Turkey agreed to buy more than 28 billion cubic metres of Turkmen gas a year, almost three times the quantity that it had signed up for in Tehran.

ECONOMIST: Turkey and Iran