There was no smell from the plane. But the Bárðarbunga eruption did emit a lot of sulphur dioxide [1][2].

[1] http://en.vedur.is/pollution-and-radiation/volcanic-gas/meas...

[2] https://en.wikipedia.org/wiki/2014%E2%80%932015_eruption_of_...

Iceland's geysers certainly do.

wreak -> reek

sulphur reeks

havoc is wreaked