As noted in our previous issue, you have several defenses against toxic dusts. These include proper ventilation, wearing a respirator, and other measures. If this seems like so much hassle, there is yet another way to defend against toxic dusts especially those arising from construction activity. It's simply a matter of questioning why you need to be in that specific area at that specific time.
Suppose you're installing a transformer, while on a nearby mezzanine, another crew starts welding and grinding. You can smell and taste the metal dust. You can even see it starting to accumulate on the paint of the transformer.
If you ask the other crew when they expect to be done, you can probably do some other activity in the meantime. But this change might not fit with the project plan. In such cases, it may be more practical to adjust the project plan than fight the dust.