The central bank's website showed the exchange rate as 11, 180 rial to one US dollar.
BBC: Iran's rial slides against US dollar on fresh sanctions
The rial is dying and hyperinflation is creating real potential for full-fledged economic panic.
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Iran's oil exports have plummeted more than 50% as has the value of the rial, Iran's currency.
All told, the rial has lost more than 80 percent of its worth over the past year.
Its currency, the rial, has seen its value plunge, and vital medicines are said to be in short supply.
President Ahmadinejad has blamed Western sanctions for the fall in the rial, saying they amounted to an economic war.
The cap the central bank kept on the rial's fall is suddenly removed.
The rial is not traded on the global currency markets, so it is not possible to produce accurate figures for its value.
BBC: Iran rial: Mahmoud Ahmadinejad blames slide on 'enemies'
"Both Singapore and Hong Kong are trying to develop their debt markets, " says Sergio Rial, Asia-Pacific CEO for Dutch banking giant ABN-Amro.
The rial has reportedly lost more than 80% of its value since 2011 because of US-led trade sanctions over Iran's nuclear programme.
Ae rial spray will kill the adult insects but not the larvae.
Inflation has been ramping at 20% a month, and the rial has lost roughly half its value against the dollar in recent months.
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Iran's currency, the rial, is also believed to have lost 80% of its value against the dollar since the start of the year.
The value of Iran's currency, the rial, has fallen by nearly 50% against the dollar in the past month on the black market.
On Tuesday, the rial was said to be trading in Iran at about 37, 500 to the dollar, down from about 34, 200 late on Monday.
BBC: Iran rial: Mahmoud Ahmadinejad blames slide on 'enemies'
When U.S. President Barrack Obama signed the sanctions legislation into law in July 2010, the rial was trading at just over 10, 000 to the dollar.
And the value of the Iranian currency, the rial, has lost at least half of its value against the U.S. dollar from a year ago.
According to reports, the rial was being traded at 17, 800 to the dollar by money changers in Tehran on Monday, down from 15, 900 on Sunday.
BBC: Iran's rial slides against US dollar on fresh sanctions
Most candidates, whether moderate or not, are keeping their heads down during this flashpoint of anger being expressed on the streets linked to the falling rial.
And although the rial passed the 10, 000 mark in 2009, the central bank successfully managed to keep it hovering around that level for some eight years.
Iran's currency, the Rial, is also believed to have lost 80% of its value against the dollar since the beginning of 2012, making imports prohibitively expensive.
This way, runs the governor's logic, he will be able to help export-oriented companies to grow and at the same time suppress the rial's chronic tendency to oscillate.
On October 1st alone, the value of the Iranian rial declined by some 17 percent, collapsing to 34, 700 to one American dollar. (It has since reportedly fallen still further).
The collapse of the rial is also boosting inflation.
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Several major foreign airlines announced that they were discontinuing service into Tehran due to the volatility of the Iranian rial and shipping giant Maersk halted all port calls to Iran.
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On Thursday, Iran's central bank devalued the rial by 8% against the dollar and ordered all currency-exchange shops to adhere to the official rate or be shut down, according to Iran's official media.
The PC T rial (Clinical Trial Comparing Percutaneous Closure of Patent Foramen Ovale Using the Amplatzer PFO Occluder with Medical Treatment in Patients with Cryptogenic Embolism) randomized 414 patients with PFO who had had an ischemic stroke, TIA, or a peripheral thromboembolic event to either medical therapy or PFO closure with the Amplatzer PFO Occluder.
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