Smoke scare on ISS

HOUSTON - International space station astronauts pulled an alarm and donned protective gear Monday after smelling a foul odor that turned out to be a vapor leaking from an oxygen vent, NASA said.

The crew first reported smoke but it turned out to be an irritant, potassium hydroxide, leaking from an oxygen vent, Suffredini said.

source

Bet that caused a few worries, especially so soon after the new solar panels have been deployed and put into action.