Yes sorry cold vapour. The air con was at the coldest temp and lowest speed and for a few seconds this vapour appeared. The outside temp was about 18c Thanks
It is possible for cold vapour to emit from the vents,but it is not dangerous.It could be caused by the evaporator water not draining away correctly.I would get the drain tubes checked for any blockage.
It's just water vapour condensing due to the lowering of temperature.
I've seen it inside an aircraft on the apron at start up. Can cause some alarm as there's usually the smell of jet fuel around and passengers could think it's smoke.