Airports in Buenos Aires have resumed normal operations after being closed by ash from the erupting Puyehue volcano in southern Chile.
The ash has swept across large swathes of neighbouring Argentina and has now reached southern Brazil. Prevailing winds are taking it towards the Atlantic ocean.
The vast quantities of ash being produced from the Andean volcano, which has lain dormant for 50 years, are endangering air travel and causing headaches wherever it falls.
At this time of year in southern Argentina, people are more used to shovelling snow, and volunteers are out in force to tackle the fallout. However, back in Chile, although the eruption is weakening heavy rains are bringing with them a new risk of avalanches as the ash becomes waterlogged where it lies.