Our Strata Committee did the following: Raised special levies for $33K for carpet and painting through two different contractors.
It’s unlikely that the committee passed the special levy as that has to be done at a general meeting, but they probably promoted the idea.
Regarding responsibility for the dust and its effects, if they were acting in good faith, then the committee members are not individually or collectively liable for any errors they may have made.
However, if they had been warned that there would or probably would be a contamination issue, or that they should reasonable have known this, and they did nothing to take that into account, that could be another matter which would most likely have to be resolved through a civil action, rather than at a strata tribunal.
Otherwise, the responsibility lies with the Owners Corporation – i.e. all owners – and your insurers.