http://www.zerohedge.com/sites/default/files/images/user5/imageroot/paulson/smoke.gif (Right click the picture and select view image info to restart .gif if it's not working.)
This visual caught my eye with its depiction of the extension of the smoke plumes over Europe and into Northern Asia as well as parts of Northern Africa and into the Atlantic Ocean. It clearly shows the eruptions effects from start to most recent image on the 18th of April. The way that the gif is organized, the area the plumes cover and how much heat is built up in each region is very easily visible. With this info, it would not be hard to convince the average bystander that it would be dangerous to fly anywhere until the smoke plumes clear up.