I work at a place that does a lot of soldering. my boss made some comments about how he's not sure the air circulation is the best. they have some weird filters in the ceiling that occasionally mist us with water like grocery store veggies. i noticed black dust on them, blacker than I'd ever seen. Is it possible there is lead dust in the air? How could I find out? I don't trust them or their safety standards at all. How dangerous is it to be near small pools of molten lead all day?