Okay, so, not knowing squat, but what little I know, I have thoughts?
I admit, I looked at a setup today that had the air intakes for the skimmer plumbed by tubing clear outside the building, with mesh on the outside and refillable inline carbon filters in the maintenance room. Which gets me thinking...
Drape the tank in plastic sheet like you use for painting over, etc., maybe even lightly weighted over the edges to keep it in place. I think that's a given, regardless?
Either shut off your skimmer, or connect a hose to your air intake and run it to someplace where the air is cleaner, and while you're at it, put a carbon filter inline with it, with filter floss or better over the end. Ideally this might be outside the home altogether. If you don't have a GREAT or easy immediate access to clean air, depending on your circumstances, get the end of the tube as far away from your tank as is possible.
If you're not using a skimmer, then use an air pump with an airstone or diffuser disc or whatever, on as long as a
Either way, if you can't get fresh, outside air readily, whether you're using an air pump to drive an air stone, or running a line to/from your skimmer, I would suggest adding a set of OV/P100 particulate filters for a respirator mask. The aforementioned inline carbon filter will help for normal stuff - typical low-concentration pollutants - but paint inside is another story, and you'll want a filter designed for it. While you're at it, maybe go ahead and buy a cheap mask too, that way you can cut off its bayonet connections for the filters and affix them to whatever apparatus you're going to rig up to connect your air hoses to, or place your air pump in (or both). You could also just buy a powered ventilator hood setup, and connect its output pipe through the sheeting,
et voila.
Is it overkill? Maybe. I mean, ideally you can just ventilate to a window pretty easily from under a drop cloth, and call it a day, but
Sans that option, I'd think filtered forced-air would be the way to go, and keep as much as that stuff out of your tank as possible.