Popacatapetl in Mexico has been getting more active throughout 2013 and has now started preatic eruptions (steam) and some ash eruptions. This increased activity has worried some of the American airlines flying to Mexico City and has caused them to cancel flights. The Mexican authorities feel that the danger isn't that great and the airport reamins open.
This is an interesting reversal of attitudes during Europe's ash problem with the eruption of Eyjafjallajokull in Icleand in 2010 where airlines wanted to fly and aviation authorities banned flights. Perhaps it highlights the importance of the ongoing research into the safe level of ash for flying. What level of danger is acceptable?
BBC News story
Ash research
Video of vent
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