Here is a by-the-numbers look at how businesses, travellers and Iceland have been affected as stalled travel in Europe slowly resumes:
By the end of the day Tuesday, Eurocontrol expects that 95,000 flights will have been cancelled since planes were first grounded on Thursday.
The disruption is estimated to have cost European airlines about $1 billion in revenues.
The volcano under the Eyjafjallajokull glacier spewed debris that rose up to five kilometres on Monday night, according to the U.K. Meteorological Office.
An additional 20,000 passengers spots have been made available in the Eurostar, Eurotunnel and ferries, Andrew Adonis, U.K. transport secretary, told the Guardian.
The U.K. Met Office says a 600-metre deep ash cloud is travelling at an altitude of four kilometres over regions of the U.K.
Tremors from the volcano — caused by magma pushing through the crust — are being felt as far away as 25 kilometres from the crater. "It's like a shaking in the belly. People in the area are disturbed by this," said Kristin Vogfjord, geologist at the Icelandic Meteorological Office.
Exporters dependent on air cargo have been hit hard by the disruption.
"Regarding exports, about three per cent of our merchandise travels by air and in the last few days we have had a reduction in our exports of about 10 million euro. Those products hardest hit are perishable goods, for example asparagus and strawberries, cut flowers, fish and mozzarella," Sergio Marini, president of Italian farming union Coldiretti, told Reuters.
Health effects from the ash were insignificant for people in Europe, said one meteorological expert.
"If you sit in Geneva in a bar and somebody smokes next to you, you probably have 10 to the power of three times more fine particles entering your lungs," Herbert Puempel, head of the World Meteorological Organization's aeronautical meteorology division, told a briefing, according to Reuters.
Scientists are monitoring the Katla volcano, near the volcano beneath the Eyjafjallajokull glacier, for fears that it too could erupt. Katla erupts about every 80 years with the last event occurring in 1918.
About 300 British travellers and 500 soldiers returning from Afghanistan were carried on a Royal Navy warship from northern Spain to the U.K. on Monday.
Colin Macpherson, an earth scientist at Britain's University of Durham, said the Eyjafjallajokull volcano is emitting an estimated 150,000 tonnes of carbon dioxide per day, according to AFP.